كليدواژه :
كشاورزي , عملكرد , اثر خاك ورزي , Soybean , كشت دوم , Yield , سويا , tillage systems effect , double cropping
چكيده لاتين :
In order to study the effects of four tillage systems on yield components of three soybean cultivars, an experiment was conducted in a field at Araghi-Mahalleh Research Station of Gorgan in summer of 1997, after wheat was harvested. The experiment was factorial based on a randomized complete block design with four replications and 12 treatments. Treatments ware the combinations of four tillage systems and three soybean cultivars. The tillage systems were Ti) burning wheat straw; two perpendicular disks; irrigation; a shallow disk; planting, T2) burning wheat straw; irrigation; direct drilling (no-tillage), T3) two perpendicular disks on the field consisting of wheat straw; irrigation; planting and T4) irrigation; direct drilling on the field having wheat straw (no-tillage). The three soybean cultivars used in the experiment were Williams, Gorgan 3, and Sahar. Characteristics such as number of days from sowing to flowering and maturity, number of seeds per pod, number of pods per plant, number of seeds per plant, 1000 seeds weight, and grain yield were measured. The results indicated that the T3 and T4 tillage systems increased number of days to flowering and maturity, 1000 seeds weight, and grain yield, compared to the other systems. However, there was no significant differnce among four tillage systems in number of seeds per pod. The number of days from sowing to flowering and maturity and number of pods per plant in Sahar cultivar were higher than those of the other two cultivars. The highest grain yield was obtained from Sahar cultivar under T4 tillage system. In this experiment, 1000 seed weight was the only component that showed significant positive correlation coefficient with the grain yield.
