[Differences in uptake, utilization and loss of nitrogen and phosphorus in a Chinese double rice cropping system under different irrigation and fertilization managements].

In order to optimize water and fertilizer use in the double-cropping rice in eastern Fujian Province, a field runoff plot experiment was conducted to investigate rice yield, nutrient uptake, and runoff losses of N (nitrogen) and P (phosphorus) in the T(no chemical fertilization with traditional flooding irrigation), T(common chemical fertilizer of 273 kg N·hm, 59 kg P·hm, and 112 kg K·hm combined with traditional flooding irrigation), T(chemical fertilizer of 240 kg N·hm, 52 kg P·hm, and 198 kg K·hm combined with traditional flooding irrigation) and T(chemical fertilizer combined with shallow intermittent irrigation) treatments. Results showed that early rice grain yield in the T, T and T treatments significantly increased by 0.7, 1.