SELECTED CONTENTS

Regional Fruit Research Station, Vengurle, Dist. Sindhudurg, 416 516 (M.S.), India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.23

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Abstract: Field experiments were conducted from 2000 to 2002 at 2 locations (Vengurle and Mulde) in Konkan, Maharashtra, India to evaluate the performance of the bold aonla (Emblica officinalis [Phyllanthus emblica]) cultivars NA-7, Krishna, Chakaiya and Kanchan. Based on pooled data for 3 years, Kanchan recorded the highest yields of 40.82 and 12.77 kg/tree at Vengurle and Mulde, respectively. Thus, Kanchan is highly recommended for cultivation in the Konkan region. However, for effective cross pollination and higher yield, mixed planting of Kanchan with Krishna and NA-7 could be the best strategy for aonla cultivation in the region. Monsoon season harvest proved to be superior under Konkan conditions.

National Bureau of Plant Genetic Resources Regional Station, Bhowali, Nainital, Uttaranchal - 263 132, India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.24

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Abstract: Phenotypic and genotypic coefficients of variability, heritability along with genetic advance as percentage of mean were estimated in 17 strawberry accessions, grown in 1997 in Bhowali, Uttaranchal, India, for 16 characters. Fruit length showed high coefficient of variation (104.56%). Percentage of plant flowering showed the maximum phenotypic and genetic coefficient of variations, followed by fruit volume, flower number, number of flower trusses per plant and flower disk diameter. Fruit weight, plant height, petiole length, percentage of plant flowering and fruit volume showed high heritability coupled with high genetic advance as percentage of mean, which indicated that selection can be made for improvement. The genotypic correlation coefficients were higher than the phenotypic correlation coefficients. This indicated little role of environment in the expression of genetic relationship. Fruit number per plant was positively and significantly correlated with fruit volume, fruit weight, flower disk diameter,

Department of Horticulture, Institute of Agricultural Sciences, BHU, Varanasi - 221 005 (U.P.), India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.25

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Abstract: A study was conducted during 1999-2000 in Varanasi, Uttar Pradesh, India, to investigate the inbreeding depression between Vigna unguiculata and V. sesquipedalis [V. unguiculata subsp. sesquipedalis]. The experiment was carried out in a line x tester design and data on 30 hybrids generated from 13 parents were analysed for inbreeding depression in the F2 generation. Observations were recorded for 13 characters, i.e. days to 50% flowering, days to 1st green pod picking, plant height, peduncle length, number of primary branches per plant, pod length, pod diameter, number of peduncles per plant, number of pods per peduncle, number of pods per plant, number of seeds per pod, green pod yield per plant and 100-seed weight. Significant and varying degrees of inbreeding depression was observed for all the parameters, indicating the presence of high degree of diversity among the parents and presence of non-additive gene action. Cross combination KLS-10 x Cowpea-263 yielded more in the F2 generation for green pod yield

Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore - 641 003, India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.26

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Abstract: BSR-1 is a new high-yielding (155 kg/tree, 42 952 kg/ha), self-fruitful, and late-maturing cultivar of aonla (Emblica officinalis [P. emblica]) selected from a large number of germplasm from Bhavanisagar, Tamil Nadu, India. Its fruits are flattened at the base and round at the apex, with an average weight of 27.30 g/fruit. The fruits contain high total soluble solids (18.1 degrees brix) and vitamin C (620 mg/100 g of flesh), low phenol (29.75 mg/g of flesh), and high crude fibre content (4.31%).

Department of Horticulture, G.B. Pant University of Agri & Tech., Hill Campus, Ranichauri - 249 199, (Uttaranchal), India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.27

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Abstract: Six important peach cultivars namely, Tessia Samisto, Early White Giant, Stark Early Giant, Hales Early, Crawford Early and July Elberta, were evaluated for their physico-chemical traits under humid temperate mid-hill conditions of Uttaranchal, India during 2000/01. The maximum fruit size (6.72x6.15 cm), weight (89.21 g) and volume (91.51 ml) were recorded in Crawford Early, followed by July Elberta (5.68x5.47 cm, 81.69 g and 83.14 ml, respectively). The maximum TSS (12.79 degrees Brix) and total sugars (11.56%) were also registered in July Elberta, whereas maximum acidity (0.98%) and ascorbic acid (6.42 mg/100 g) were recorded in the cultivars Hales Early and July Elberta, respectively. On the basis of these parameters, July Elberta and Crawford Early have been found superior under mid-hill conditions of Uttaranchal.

Department of Horticulture, Janta College, Bakewar (Etawah), U.P. 206 125, India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.28

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Abstract: A field trial was conducted during the winter season of 1998/99 in Etawah, Uttar Pradesh, India to determine the optimum concentration of naphthalene acetic acid (NAA), gibberellic acid (GA) and chlormequat (CCC) for application on French marigold. Spraying of NAA (50, 100 and 200 ppm), GA (100, 200 and 400 ppm) and CCC (200, 400 and 600 ppm) was done in February. Data were recorded for plant height, diameter of main stem, number of branches per plant, number of leaves per plant, days to first flowering, diameter of flowers, fresh weight of flowers, number of flowers per plant, and flower yield per plant. CCC and GA application gave quite beneficial effects on these parameters. GA at 400 ppm and CCC at 600 ppm recorded the highest flower yield per plant (127.71 g) and number of flowers per plant (78.83), respectively. These chemicals had no adverse effect on the growth and flowering of French marigold.

Department of Agricultural Economics, Faculty of Agriculture, The University of Ege, 35100 Bornova, Izmir, Turkey.

DOI: https://doi.org/10.37855/jah.2003.v05i02.29

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Abstract: Some technical and economic characteristics of peach growing in Kemalpasa, Izmir, Turkey, were examined. Data were obtained from a sample of 63 peach growers. Average yield per hectare and per tree was determined to be 16 848 kg and 37.7 kg, respectively. The average orchard size was 1.09 ha. Growers preferred square planting with 4.5 m x 4.5 m spacing rather than triangle planting. Redhaven, Cresthaven, Triogem and Dixired were the major cultivars grown. Net return per hectare and per tree was determined to be $839 and $1.88, respectively.

School of Biological Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.

DOI: https://doi.org/10.37855/jah.2003.v05i02.16

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Abstract: S. acmella [Blainvillea acmella] was successfully micropropagated using axillary buds as explants. The aseptic axillary buds formed multiple shoots within 5 weeks when cultured on MS medium supplemented with 2.0, 4.0, 6.0 and 8.0 mg benzyladenine (BA)/l. The addition of IBA as low as 2 mg/l into the MS medium containing BA had no significant effect on the multiple shoot formation. MS medium supplemented with 0.5 mg BA/l was sufficient for the proliferation of rooted multiple shoots. First subculturing of the in vitro individual shoots in the same proliferation medium could double the formation of multiple shoots.

Department of Plant Sciences, Alemaya University, P.O. Box 165 Dire Dawa, Ethiopia.

DOI: https://doi.org/10.37855/jah.2003.v05i02.17

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Abstract: In a study conducted at Bavaria Estate, Hoedspruit, the northern province of South Africa, the mango cultivars Keitt and Tommy Atkins were subjected to the following treatments over 2 seasons: (1) inflorescence removal at the point of apical bud attachment during full bloom; (2) inflorescence removal together with apical whorl of leaves subtending the inflorescence (about 5 cm from the tip) during full bloom; (3) removal of 50% of the total inflorescences (every alternate shoot of the tagged branches) together with apical whorl of leaves subtending the inflorescence during full bloom; (4) renewal pruning where 20-30% of termination shoots with weak, misshaped and small fruits were cut back to a suitable node in October; (5) postharvest pruning where termination shoots that had been bearing fruits the previous season were cut back to a suitable node; (6) removal of terminal buds just before bud break; and (7) no pruning treatments (control). Pruning at the point of apical bud attachment induced re-flowering, m

Department of Soil Science and Agricultural Chemistry, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore - 641 003, India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.18

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Abstract: The Compositional Nutrient Diagnosis (CND) and Diagnosis and Recommendation Integrated System (DRIS) nutrient index ranges were derived from a Muscat grape database to relate nutrient concentration and indexes with berry yield. A Muscat grape database of 188 observations on commercial yields and N, P, K, Ca, Mg, Na, S, B, Zn, Cu, Fe and Mn were taken. The proportion of low-yield specimens in the survey population was computed at inflection point of variance ratio function and was associated with a Cate and Nelson statistical value (r²) of 4.7 that was confirmed in the validation subpopulation. Critical CND nutrient indexes were found to be symmetrical about zero as follows: -0.45 to +0.45 for CND/N, -0.39 to +0.39 for CND/P, -0.45 to +0.45 for CND/K, -0.93 to +0.93 for CND/Na, -0.45 to +0.45 for CND/Ca, -0.33 to +0.33 for CND/Mg, -0.60 to +0.60 for CND/S, -1.02 to +1.02 for CND/B, -0.58 to +0.58 for CND/Zn, -0.78 to +0.78 for CND/Cu, -0.55 to +0.55 for CND/Fe, -0.16 to +0.16 for CND/Mn and -0.49 to +0.49 for

Agricultural Research Station, Tamil Nadu Agricultural University, Kovilpatti - 628 501, India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.19

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Abstract: A study was conducted to develop gamma radiation-induced resistant clones of banana (Musa sp.) cv. Rasthali against F. oxysporum f.sp. cubense race-1. Shoot buds of Rasthali irradiated with 20, 40, 60, 80 and 100 Gy by using Co60 in a gamma chamber were used for in vitro culture establishment and to develop resistant clones. Shoot buds irradiated with 40 Gy had the maximum shoots per culture and percentage of culture establishment. Other doses of gamma radiation inhibited the culture establishment when compared to the untreated control. The shoots irradiated with 40 Gy were used to develop resistant clones against toxins of race 1. To standardize the concentration of the culture filtrate of the pathogen for the tolerant clone selection, the multiple bud clumps were cultured on MS medium supplemented with 2-15% crude culture filtrates. The growth of multiple bud clumps was completely inhibited on the medium containing 10% culture filtrate. In the successive selection, the rate of survival of the plantlets incr

Division of Genetics and Plant Breeding, National Botanical Research Institute, Lucknow - 226 001, India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.20

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Abstract: An experiment was conducted during 2002/03 in Lucknow, Uttar Pradesh, India to test the suitability of direct and indirect selection for high foliage yield and quality in Chenopodium album over successive cuttings. Thirteen germplasm lines were evaluated for moisture, chlorophyll a and b, carotenoid, fibre, protein and ascorbic acid contents and foliage yield. High heritability and moderate to high genetic advance were observed for all characters, except for moisture content, in all cuttings. Chlorophyll a exhibited the highest correlated response for the first and third cuttings, while fibre content exhibited the highest correlated response for the second cutting. A multiple selection index is suggested to enhance foliage yield. The estimates of correlated response and relative selection efficiencies were in proportion with each other although values for the latter were less than one.

Food Contaminants Division, Defence Food Research Laboratory, Siddarthanagar, Mysore - 570 011, India.

DOI: https://doi.org/10.37855/jah.2003.v05i02.21

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Abstract: A study was conducted to evaluate the uptake of carbendazim by 8 fruits and vegetables, i.e. tomato (Lycopersicon esculentum), apple (Malus pumila), carrot (Daucus carota), okra (Abelmoschus esculentus), orange (Citrus sinensis), grape (Vitis vinifera), sapota (Achras zapota [Manilkara zapota]) and banana (Musa paradisiaca), dipped in aqueous carbendazim suspension under laboratory conditions. The effect of carbendazim dips on the storage life of apple and tomato was also investigated. The uptake of carbendazim varied significantly, ranging from 68.97+or-2.89 to 813.64+or- 11.46 micro g (mean 342.13 micro g), among the fruits and vegetables. The lowest uptake was recorded in apple, followed by banana, orange, tomato, okra, grape, sapota and carrot. Dip treatments more effectively extended the storage life of tomato than apple and at ambient (32+or-2 degrees C) than at low temperature (7+or-2 degrees C). Dip treatments also decreased the cumulative physiological loss in weight and spoilage of tomato and apple,

Aridland Agriculture and Greenery Department, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait.

DOI: https://doi.org/10.37855/jah.2003.v05i02.22

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Abstract: To promote efficient use of expensive water resource as well as to maintain soil productivity and health in Kuwait, it is important to ascertain plant performance with regard to different irrigation regimes. A study was conducted to determine the effects of induced water stress on the growth and greenery impact of four ornamental plants, namely Vitex agnus-castus, Caesalpinia mexicana, Myoporum parvifolium and Rosmarinus officinalis, grown under the harsh arid climate of Kuwait. Acclimatized plants of these species were planted in Salmiya in July 2002. Plants were subjected to water stress by irrigating them at the rate of 25, 50 or 100% of the daily evapotranspiration rates during that month (3.75, 7.5 or 15.0 mm/d). The irrigation was adjusted according to average monthly ET rates. Growth and visual greenery impact data were recorded at weekly intervals during the first 87 days after planting and then at monthly intervals. Soil moisture was determined at weekly intervals using field tensiometers and oven-dr

Centro de Investigacion, Experimentacion y Servicios del Champinon (CIES), C/ Penicas s/n, Apartado 8, E-16220 Quintanar del Rey, Cuenca, Spain.

DOI: https://doi.org/10.37855/jah.2003.v05i01.03

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Abstract: A study was conducted to evaluate the suitability of composted vine shoots (as alternative to peat) as casing material in the cultivation of mushroom (Agaricus bisporus). The effect of scratching on the suitability of the casing materials based on peat and vine shoots was also examined. The treatments consisted of scratched and non-scratched soil + sphagnum peat (S+SP, 4:1 v/v), soil + black peat (S+BP, 4:1 v/v) and soil + composted vine shoots (S+CV, 4:1 v/v). Based on the main production parameters measured (number of mushrooms produced, unitary weight, yield and earliness), composted vine shoots performed similarly to peat-based casing materials. However, the possibilities of using composted vine shoots are limited due to the appearance of spots caused by Trichoderma spp. on the fruit bodies. Scratching created an open structure in the casing layer to enable uniform and abundant fructification. In general, for the different casing types, scratching had a positive effect on fructification. This practice ind

Division of Floriculture and Landscaping, Indian Agricultural Research Institute, New Delhi - 110 012, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.04

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Abstract: The effects of different pulsing treatments, i.e. 10% sucrose + 250 ppm aluminium sulfate (Al2(SO4)3) for 12 h, 10% sucrose + 0.5 mM silver thiosulfate (STS) for 12 h and 8% sucrose + 200 ppm 8-hydroxyquinoline citrate (8-HQC) for 12 h, and durations of cold storage, i.e. 4 and 5 days, on the cut spikes of tuberose (Polianthes tuberosa) cv. Double were studied. Pulsing and cold storage improved the postharvest life and quality of tuberose cut flowers. Pulsing with 10% sucrose + 250 ppm Al2(SO4)3for 12 h and cold storage of cut spikes for 4 days was the best treatment combination for rachis length, delay in wilting of first, third and last opened floret pair, extension of useful life, retention of fragrance, water uptake, opening of florets, increase in diameter and length of first, third and last opened floret pair, and vase life. This treatment also recorded the maximum vase life of 8.90 days.

Department of Soil Science and Agricultural Chemistry, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore - 641 003, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.05

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Abstract: The optimum levels for nutrients in the rhizomes of turmeric were generated by Critical Value Approach (CVA), Diagnosis and Recommendation Integrated System (DRIS)/Modified Diagnosis and Recommendation Integrated System (MDRIS) and Compositional Nutritional Diagnosis (CND). Approximately 500 soil and rhizome samples were obtained from commercial fields in Coimbatore, Tamil Nadu, India, during July-September 2000. Using the new norms of DRIS/MDRIS for rhizomes, the extent of deficiency of none of the micronutrients (Zn, B and Fe) matched with the values assessed with the soil analysis. Approximately 17% of the turmeric growing area was limited by mineral nutrition. Approximately 23% was identified as having possible imbalances. Based on the order of requirement, predominance of Zn deficiency was well indicated by CND than DRIS.

Department of Mycology and Plant Pathology, Dr. Y.S. Parmar University of Horticulture and Forestry, Solan (H.P.) - 173 230, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.06

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Abstract: Seven species of VAM fungi were found associated with ginger rhizosphere in Himachal Pradesh, India. They included Glomus mosseae, G. caledonium, G. pulvinatum, Acaulospora laevis, A. scrobiculata, Gigaspora albida and Scutellospora minuta. Among the different VAM fungi species, frequency of Glomus species was maximum. The morphological characters of these VAM fungi are described.

Division of Fruit Crops, Indian Institute of Horticultural Research, Hessaraghatta, Bangalore - 560 089, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.07

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Abstract: A study was conducted in Bangalore, Karnataka, India to determine the presence of reciprocal effects and to assess the parents best suited for the transfer of desirable characters in commercial cultivars of mango. The cultivars Alphonso, Banganapalli, Neelum, Kalapadi and Janardhan Pasand were utilized for crossing, including reciprocals. The F1 intervarietal progenies of the combinations Alphonso x Banganapalli, Alphonso x Neelum, Alphonso x Kalapadi and Alphonso x Janardhan Pasand were evaluated for different characters, i.e. fruit weight, fruit volume, total soluble solids (TSS), skin weight, stone weight and pulp percentage. The study showed that non-additive variance controls the characters. Heritability was low and the chances of hybrid vigour manifesting for the characters in the F1 generation were high. Selection of progenies can be made based on fruit size, i.e. medium-sized fruits will have good TSS and big-sized fruits will decrease this character. For the characters studied, the phenotypic coeffic

Defence Agricultural Research Laboratory, Pithoragarh, Uttaranchal, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.08

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Abstract: Eight inbred lines of cabbage, namely Sel-2, Sel-3, Sel-4, Sel-1, Sel-36 Sector, Sel-6, Sel-5 and Sel-7, were crossed in all possible combinations (excluding reciprocals), and the 28 F1s along with their parents were planted in September 2001 in Pithoragarh, Uttaranchal, India. Sel-1 x Sel-36 Sector was identified as the best among all combinations, having significant hybrid vigour (heterosis) for biological yield, head weight, net weight of head and head size index.

Slovak Water Management Enterprise, S.P., Irrigation and Drainage Branch Office, Vrakunska 29, 82563, Bratislava 211, Slovakia.

DOI: https://doi.org/10.37855/jah.2003.v05i01.01

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Abstract: Experiments were conducted during 1999 and 2000 in Bratislava, Slovak Republic to evaluate the effects of different irrigation and fertilizer treatments on the quality of apple cultivars Gala, Jonagold and Idared. The treatments were: (A) liquid fertilizer (80 kg N, 80 kg P2O5 and 125 kg K2O/ha) combined with irrigation (fertigation); (B) liquid fertilizer (120 kg N, 80 kg P2O5 and 125 kg K2O/ha) combined with irrigation (fertigation); (C) solid fertilizer (80 kg N, 80 kg P2O5 and 125 kg K2O/ha) with irrigation; and (K) control, solid fertilizer (80 kg N, 80 kg P2O5 and 125 kg K2O/ha) without irrigation (atmospheric precipitation only). An increased rate of N (120 kg/ha) resulted in bigger shares of Selective and Class I grade fruits. A similar effect was produced by drip irrigation and typical response of individual cultivars was confirmed. In 1999, the share of Selective grade fruits by Gala was 93.3% in the non-irrigated treatment, which declined to 39.59% in the following year. An increased rate of N and

Post-harvest Technology Laboratory, Department of Horticulture, Rajasthan Agricultural University, SKN College of Agriculture, Jobner - 303 329, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.09

Agricultural Research Station, Mulde. Dist. Sindhudurg, Maharastra - 416 520, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.10

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Abstract: A field experiment was conducted from 1993/94 to 1998/99 in Sindhudurg, Maharashtra, India to evaluate the effect of water stress on the growth and yield of Tenera oil palm [Elaeis guineensis]. Intermittent water stress (rainfed) reduced fresh fruit bunches yield by 88.46% compared with the non-stressed treatment (irrigated). Leaf production was reduced by 30% in the early growth phase and by 12.5% in the later growth phase due to water stress. Stem growth was reduced by 49.1% due to water stress. Production of male inflorescences was least affected, but female inflorescences were reduced by 86% under intermittent water stress. This resulted in more than 91% reduction in the number of fresh fruit bunches and ultimately caused 88.46% reduction in fresh fruit bunches yield.

Department of Horticulture, S.K.N. College of Agriculture, Rajasthan Agricultural University, Jobner - 303 329, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.11

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Abstract: Ten-year-old plants of 8 commercial cultivars of Ziziphus mauritiana (Gola, Seb, Umran, Mundia, Illaichi, Tikadi, Jogiya and Bagwadi) and 3 local selections of Z. rotundifolia [Z. nummularia] (Local-1, Local-2 and Local-3) were evaluated in Jobner, Rajasthan, India. Correlation and path coefficients were assessed for 13 yield attributes, i.e. duration of flowering, fruit set, fruit drop, fruit length, fruit breadth, fruit weight, stone weight, stone length, stone diameter, pulp weight, specific gravity, fruit yield and harvest duration. Fruit set, fruit length, fruit breadth, fruit weight, stone diameter, pulp weight, specific gravity and harvest duration had significant positive correlation with fruit yield. Fruit length had the highest direct positive effect on fruit yield, followed by fruit weight and fruit breadth.

Department of Horticulture, N.D. University of Agriculture & Technology, Kumarganj, Faizabad, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.12

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Abstract: Forty ber (Zizyphus mauritiana [Ziziphus mauritiana]) accessions, grown in Faizabad, Uttar Pradesh, India, were screened against black leaf spot disease (caused by Isariopsis indica var. ziziphi) during 1997-98 to 1999-2000 to determine the resistant source(s) for crop improvement. Tikri during 1997-98 and 1999-2000; Seedless during 1998-99; and ZG-3 during 1999-2000 were found immune. Guli, Seedless and Ber selection-5 during 1997-98; Guli, Darackhi-2, Ber selection-2, 3, 4 and 5 during 1998-99; and Jalandher, Kali, Bagwadi, Banarasi Peondi, Illaichi, Villaiti, Sanour-3, Chhohara, Katha, Seedless, Darakhi-2 and Ber selection-5 during 1999-2000 were found resistant. Other accessions showed moderately susceptible to susceptible reaction against the disease. An experiment on the management of the disease was conducted with ber cv. Gola (a susceptible cultivar). Single spraying of fungicides (0.1% carbendazim, 0.2% mancozeb and 0.2% copper oxychloride) and 3.0% neem [Azadirachta indica] powder (Nimuri) at 10 lit

Division of Genetics and Plant Breeding, National Botanical Research Institute, Lucknow - 226 001, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.13

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Abstract: Eight exotic genotypes of Chenopodium quinoa were sown on normal and sodic soils in Lucknow, Uttar Pradesh, India, during 2000-01 to compare the grain yield potential, variability and genetic association among the different component traits (plant height, stem diameter, primary branches per plant, number of inflorescence per plant, inflorescence length and dry weight of plant) and their direct and indirect effects on yield. High heritability and moderate genetic advance was observed for inflorescence length and grain yield on sodic soil and for stem diameter, primary branches per plant, number of inflorescence per plant, dry weight of plant and inflorescence length on normal soil. Stem diameter and number of inflorescence per plant exhibited high direct path (0.837 and 0.761, respectively) and significant positive association (0.979 and 0.967, respectively) with grain yield on sodic soil, while dry weight of plant showed high correlation (0.889) and direct path (0.972) with grain yield on normal soil. The bre

PFDC, Division of Agricultural Engineering, IARI, New Delhi - 110 012, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.14

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Abstract: This paper discusses the automation or support system for decision making in greenhouses. This automation is practised in the form of a computer program which are governed by setpoints. The choice of setpoints for environmental parameters must be done by a reasoning process integrating the situation outside the greenhouses, and inside situation that will be managed in an advantageous manner ensuring a profitable, though safe combination of growth and development factors while keeping the energy spending within acceptable bounds and as low as possible.

National Research Centre for Citrus, Amravati Road, PO Box 464, Nagpur - 440 010, Maharashtra, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.15

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Abstract: Of all the agricultural pests and diseases that threaten citrus crops, citrus canker is one of the most devastating. The disease, caused by the bacterium Xanthomonas axonopodis pv. citri, occurs in large areas of the world's citrus growing countries including India. At least 3 distinct forms or types of citrus canker are recognized. Among these, Asiatic form (Canker A) is the most destructive and affects most of the major citrus cultivars. Severe infection of the disease produces a variety of effects including defoliation, dieback, severely blemished fruit, reduced fruit quality and premature fruit drop. Warm, humid, cloudy climate, along with heavy rainfall and strong wind promotes the disease. Control of canker in countries or regions where the disease is not present include quarantine or regulatory programme to prohibit introduction of infected citrus plant material and fruit, as well as continuous and strict surveying in the field and the immediate destruction of infected trees. In countries where canker

Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore - 641 003, India.

DOI: https://doi.org/10.37855/jah.2003.v05i01.02