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Showing 2 results for Yield Components
Mehdi Ghaffari, Volume 1, Issue 1 (9-2014)
Abstract
Impact of three water deficit treatments in vegetative, flowering and grain filling stages along with optimum irrigation as control were evaluated on grain yield and agronomic characteristics of 8 sunflower cultivars (Hysun 33, Hysun 25, Farrokh, Record, Aravirski, Lakumka, Master and SHF 81-90) as a strip plot design with three replications in Khoy Agricultural and Natural Resources Research Station. Different water regimes had significant effect on growth period, plant height, stem and head diameter, seed yield and its component. Stem diameter, plant height and seed number per head were affected considerably by drought stress in vegetative stage, while head diameter by drought stress in flowering stage and growth period and seed weight by water deficit in seed filling stage. Water deficit in flowering and vegetative stages had the highest (38%) and lowest (25%) negative effect on grain yield, respectively, so flowering stage and vegetative stage established as the most sensitive and tolerant stages to water deficit, respectively. Farrokh hybrid with highest seed yield in different irrigation treatments (3686, 2856, 2256 and 2506 Kg/ha in control and water deficit in vegetative, flowering and grain filling stages, respectively) revealed as the most drought tolerant cultivator while Hysun33 lowest seed yield showed maximum drought sensitive.
Mhmoud Ghorbanzadeh Neghab , Volume 2, Issue 1 (9-2015)
Abstract
Soybean is one of the most important oil production resources in the world. In order to study of genetic diversity and relationships among quantitative and qualitative traits of 14 soybean cultivars, an experiment was conducted as a randomaized complete block design with four replications in 2013 at the Agriculture Research Farm, Shirvan Higher Education Complex. 12 traits such as seed and components yield, protein and oil content were evaluated. The results showed that there were significant differences among genotypes for all traits except protein content, which indicates the existence of genetic variations between genotypes. Zane, Century and Clombus cultivars had the highest seed yield, although, the lowest yield was achieved in Habit cultivar. Results showed that seed yield was positively and significantly correlated with number of pods per plant, number of seeds per pod, number of seeds per plant,100 seed weight, oil content, protein content and harvest index and there were significant and negative correlation between seed yield with number of days from planting to flowering . The Zane cultivar had the highest oil content of 515.8 kg ha-1. Based on the stepwise regression and path analysis the grain yield of soybean cultivars were explained by the direct and indirect effects 100 seed weight, number of pods per plant, number of seeds per pod and number of seed per plant. Considering to the residual effects and the coefficient of determination (86.7 percent), the large proportion of the variation in seed yield of soybean were determined with these four traits of seed yield. Path analysis showed that the greater and lower direct positive effects on seed yield were related to 100-seed weight and seed number per plant, respectively. In general, Zane , Columbus and Cencurty cultivars due to their high oil and seed yields can be proposed cultiveting in North Khorasan.
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