Agriculure Department , Bojnourd branch, Islamic Azad University, Bojnourd, Iran, Email: firstname.lastname@example.org
In order to study the effects of Urea, Humax and Rhizobium japonicum on yield of Soybean, a field experiment was established in 2014. It included two cultivars of soybean i.e. Habbit and L17 (main factor) with six fertiliser treatments i.e. control; seed inoculated with Rhizobium japonicum; basal nitrogen (urea) + topdress urea at R2 stage (when the flowers open in one of the two upper nodes of the main stem with a fully developed leaf visible); basal nitrogen (urea) + seed inoculated with Rhyzobium japonicum + topdress nitrogen at R2 stage; seed treated with Humax + topdress Humax at R2 stage; basal nitrogen + seed treated with Humax + topdress Humax at R2 stage (sub factors ). A split-plot randomised complete block design with three replications was adopted. Fertiliser treatments increased seed weight and seed yield significantly. The results showed that cv. Habbit along with basal nitrogen fertiliser + urea nitrogen at R2, achieved the highest seed weight. The highest seed yield in the basal nitrogen + seed treated with Humax + topdress Humax at R2 stage was observed. It can be concluded that the use of basal nitrogen in soybean is beneficial. Moreover, at the end of flowering (R2), the consumption of nitrogen can improve the potential for a higher yield.