Response of rice to increasing nitrogen rates in five soils with different mineralizable nitrogen levels

Conclusions

To determine the N rate to be used in ‘Zafiro’ rice cultivation in the area included in this study, N mineralization capacity and yield potential of each soil must be considered and thus optimize factors such as harvest index and grain sterility, which are closely associated with grain yield. Of the three N rates evaluated with the ‘Zafiro’, the best response to N rate, effect on harvest index, and grain sterility in most of the soils under study was 80 kg ha¡1.