An experiment was carried out at Horticultural Research Centre, H.N.B. Garhwal University, Chauras Campus (Uttarakhand), India during winter season, 2016-2017 with knol-khol cv. White Vienna to study the correlation coefficient between various traits. Association of yield with other characters revealed that, the knob yield per plot was highly positively significant correlation with fresh weight of knob, whole plant weight, fresh weight of leaves, plant height at harvest, knob length, Knob diameter, dry weight of leaves and days taken to complete harvest at both genotypic and phenotypic levels, where as significantly negative correlation at genotypic and phenotypic levels was observed in days taken to knob initiation. However, the association among yield components had found that the plant height at harvest showed significantly positive correlation with knob diameter, knob length, fresh weight of knob, fresh weight of leaves, whole plant weight, dry weight of leaves and dry weight of knob. The days taken to knob initiation showed highly significant positive correlation at genotypic and phenotypic levels with days taken to first harvest only, whereas knob diameter, knob length and dry weight of leaves showed negatively significant correlation with days taken to knob imitation at genotypic and phenotypic levels. The days taken to complete harvest showed positive correlation at genotypic and phenotypic levels with Knob diameter, knob length, fresh weight of knob, fresh weight of leaves and dry weight of knob. The Fresh weight of knob showed positive significant correlation at phenotypic and genotypic levels with fresh weight of leaves, whole plant weight and dry weight of leaves.
A field experiment was conducted at New Delhi during 2010–12 to find-out the influence of tillage practices and cropping systems on crop productivity and soil health in maize (Zea mays L.)/soybean (Glycine max L.) based cropping systems. Results revealed that minimum tillage with crop residue mulch improved the yield of component crops by 5–22% as well as system productivity by 5.4–7.1% in current study. The effect of minimum tillage on crop yields was more pronounced among summer season crops followed by winter season crops. Soil organic carbon (SOC) and available NPK as well as S exhibited marked improvement due to minimum tillage over conventional tillage. Soil pH and soil physical properties revealed favourable effects of minimum tillage over initial status. On an average, maize/soybean grown after summer greengram observed about 10–12% increase in yield than grown after spring sunflower. Winter season wheat, coriander, fenugreek, vegetable pea and potato exhibited 10.4, 6.9, 3.8, 6 and 11% higher yield after soybean compared to their respective yields after maize. Yield of spring sunflower in soybean– vegetable pea–sunflower system was 18 and 11% higher than its yield in maize–potato–sunflower and maize– vegetable pea–sunflower systems, respectively. The productivity of soybean based cropping systems was higher than that of maize based systems. With intervention of vegetable pea and potato during winter and sunflower during spring; the productivity of maize/soybean–vegetable pea/potato–sunflower systems was enhanced by 128% over maize/soybean–wheat–greengram systems. Similarly, replacement of wheat with coriander in maize/soybean–wheat– greengram system also improved the system productivity markedly. Diversified soybean–fenugreek/wheat/coriander– greengram systems also led to a marked improvement in SOC over initial status. Intervention of legumes also improved the available N, while cropping systems without non–legumes showed a decline in available N over initial status.
To assess the combining ability for quantitative and qualitative traits in cucumber a full diallel set of 7 parents and their 42 F1’s was evaluated at Horticultural Research Centre, Department of Horticulture, H.N.B. Garhwal University, Srinagar (Garhwal), Uttarakhand, India during 2015 and 2016. The mean sum of squares due to general combining ability (GCA) was of significant differences at 1 % level for almost all the characters. The variance due to specific combining ability (SCA) was found highly significant at 1 % level for almost all the characters. Results from general combining ability studies revealed that the parent, New Manipur-1 showed significant GCA effect in desired direction for maximum characters viz., length of vine, days to first fruit harvest and number of fruits per vine. The cross combinations, Seven Star x New Manipur-1 for length of vine, Swarna Purna x Seven Star for days to first fruit harvest; K-90 x Seven Star for number of fruits per vine and the cross PB-Naveen x Swarna Purna for total fruit yield per vine showed significant SCA effect in desired direction and found to be superior specific cross combinations.
Bangladesh J. Bot. 50(4): 1003-1010, 2021 (December)
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