Effects Of Seeding Rate And Row Spacing On Yield And Some Agronomic Traits Of Dryland Bread Wheat Of Kohdasht Cultivar

Plant pattern and used seed rate is one of the methodes of increasing grain yield per square meter. In order to study the effects of seeding rate and row spacing on yield, yield components, and some agronomic traits of dryland bread wheat of Kohdasht cultivar, an experiment was conducted under dryland farming in Agriculture Research Station of Gonbad in cropping seasons of the years 2001-2003. The experiment was set up with factorial arangment in randomised complete block desigen with three replications. The treatments were three rows spacing(12.5, 17, and 25 cm) and four seeding rates(250, 300, 350, and 400 seeds/m2). In first year, the effect of row spacing was significant on the number of fertile tiller, spike length, the number of spiklet per spike, the number of fertile spike per square meter, the number of kernel per spike, the number of kernel per spiklet, the number of kernel per square meter, grain yield, and harvest index, but the effect of row spacing was not significant on the number of total tiller, 1000 kernels weight, biological yield, and straw yield. The effect of seeding rate was significant for, spike length, the number of spiklet per spike, the number of fertile spike per square meter, the number of kernel per spike, the number of kernel per spiklet, the number of kernel per square meter, grain yield, biological yield, straw yield, and harvest index, but the effect of seeding rate was not significant on the number of total tiller, the number of fertile tiller, and 1000 kernels weight. The interaction effect row spacing with seeding rates were significant on the number of kernel per spiklet, and the number of kernel per square meter. The results of first year showed that maximum grain yield(4021.1 kg/h) was obtained from 17cm row spacing. The best seeding rate for obtaining maximum grain yield(3934.9 kg/h) was 350 seeds per square meter. In second year, the effect of row spacing was significant on, spike length, the number of fertile spike per square meter, the number of kernel per spike, 1000 kernels weight, the number of kernel per square meter, grain yield, biological yield, straw yield, and harvest index, but the effect of row spacing was unsignificant on the number of total tiller, the number of fertile tiller, the number of spiklet per spike, and the number of kernel per spiklet. The effect of seeding rate was significant on the number of fertile tiller, spike length, the number of fertile spike per square meter, the number of kernel per square meter, grain yield, and harvest index, but the effect of seeding rate was not significant on the number of total tiller, the number of spiklet per spike, the number of kernel per spike, 1000 kernels weight, the number of kernel per spiklet, biological yield, and straw yield. The results of second year showed that maximum grain yield(5348.5 kg/h) was obtained from 12.5cm row spacing. The best seeding rate was 350 seeds per square meter for obtaining maximum grain yield(5226.2 kg/h). The interaction effect row spacing with seeding rate was unsignificant on the whole of traits. In general, study of results showed that the best seeding rate and row spacing for obtaining optimum grain yield was 350 seeds per square meter and 17cm row spacing in some Gonbad regions that annual percipitation is between 300-400mm.