Effects of Previous Crop and Rate of Phosphorous Fertilizer Application on Yield and Yield Components of Rice (Oryza sativa L.) cv. Shiroudi

Growing berseem clover (Trifolium alexandrinum) prior to rice can be a good strategy for reduction of chemical fertilizer consumption and increasing the sustainability of the rice cropping systems. For this purpose, a field experiment was conducted by using a split-plot based on randomized complete block design (RCBD) with three replications, at the Rice Research Station of Tonekabon, Iran in 2014-2015. Growing berseem clover and use of fallow (control), were assigned to main plots, and amount of phosphorus fertilizer (without P and 25, 50, 75 and 100 kg.ha-1 P) to the sub-plots. At crop maturity, seed yield, yield components and phosphorus content of seeds were evaluated. The results showed that seed yield of rice (7566.3 kg.ha-1) after clover was significantly higher than after fallow (6465.1 kg.ha-1) (p