Effect of Nitrogen and Phosphorus Fertilizer on Yield and Yield Components of Sweet Sorghum (Sorghum bicolor L.)

In order to investigate the effect of nitrogen and phosphorus fertilizers on yield and yield components of sweet sorghum, this research carried out in the research center of sugarcane and related industries in the form of split plots in the form of a randomized complete block design with three replications. The main factor included 50, 100 and 150 kg/ha of nitrogen and the sub plots included 60, 90 and 120 kg/ha of phosphorus. The results showed that the interaction effect of phosphorus and nitrogen consumption on sweet sorghum grain yield was not significant. The effect of nitrogen and phosphorus fertilizer treatments on biological yield, grain yield, 1000 seed weight and number of seeds per panicle was significant at the 1% probability level. The highest grain yield with 2500 kg/ha was assigned to the nitrogen treatment of 150 kg/ha and the lowest grain yield with 1900 kg/ha was observed in the nitrogen treatment of 50 kg/ha. The highest and lowest grain yields in phosphorus treatment were assigned to 120 (2300 kg/ha) and 60 (2000 kg/ha) of pure phosphorus per hectare, respectively. In general, the highest grain yield was observed in the fertilizer treatment of 150 kg of nitrogen and 120 kg of phosphorus, and the difference between this treatment and the fertilizer combination of 150 kg of nitrogen and 90 kg of phosphorus was not significant. Therefore, the second fertilizer combination was recommended to achieve optimal yield, although more research is needed in this regard.