Effect of plant density on growth indices of four grain sorghum cultivars

To study the effect of plant density on growth indices of four grain sorghum cultivars an experiment was conducted as factorial based on Compelete Randomized Block Design with 3 replications at Experimental Field of Birjand Azad University in 2003 growing season. In this study 4 grain sorghum cultivars including Sepideh , Saravan local , Payam and Kimia and 3 plant densities 100000 , 180000 and 260000 plant/ha were investigated. The results showed superiority of Saravan local compare to other cultivars because of having maximum total dry matter, leaf area index, crop growth rate, relative growth rate, and net assimilation rate. The highest amount of leaf area ratio and specific leaf area were in Kimia and Payam cultivars, respectively. All of the above mentioned growth parameters were increased by increasing population denseity with exception of relative growth rate and net assimilation rate. From the obtained results Saravan local cultivar in density of 260000 plant /ha had the highest grain yield. The maximum relative growth rate and net assimilation rate were obtained in lowest density

The effect of plant density on yield, yield components and protein content in four grain sorghum varieties

In order to study the effects of plant density on yield, yield components protein in four grain sorghum varieties an experiment was conducted as factorial based on compeletely randomized block design with three replications in Research Field of Birjand Azad University at year 2003. In this study four varieties including “ Sepideh, Saravan local, Payam and Kimia ,, and 3 plant densities 100000 , 180000 and 260000 plant / ha were investigated. The results indicated that varieties were significantly different for grain yield, protein yield, biological yield, number of seeds per panicle, 1000 kernel weight, harvest index and protein percentage. The highest grain yield, protein yield, biological yield, number of seeds per panicle and 1000 kernel weight were observed in Saravan local and the highest harvest index was belong to Sepideh and the highest protein percentage was in Kimia. Characteristics such as grain yield, protein yield, biological yield and number of seeds per panicle were affected by density. By increaseing of plant density grian yield, protein yield, biological yield increased but seed number per panicle decreased 1000 kernel weigth, harvest index and protein percentage did not affect by density. Also interaction between variety and density was significant on seed number per panicle. According to the results of this experiment, Saravan in 260000 plant / ha density is recommended for maximum grain yield and protein yield