Combined effect of nitrogen and phosphorous fertiliser on nitrogen absorption and utilisation in rice

effect of nitrogen and phosphorous fertiliser on nitrogen absorption and utilisation in rice for hilly areas. Plant Soil Environ., 69: 25–37. Abstract: The objectives of this study were to investigate the nitrogen (N) and phosphorus (P) balance fertilisation strategy in paddy fields and to evaluate the effects on N uptake and utilisation in rice. In 2017–2018, the experiment was conducted using cv. Deyou4727 rice with four different P fertiliser levels (0, 6.6, 13.2, and 26.4 kg/ha), marked as P0, P1, P2, P3 in turn, and four different N levels (0, 90, 150, and 270 kg/ha), similarly marked as N0, N1, N2, N3 in turn. The results showed that in the N-insufficient (N0, N1) environments, the P1 treatment increased N uptake and promoted transfer to the grain. However, high-P (P3) application increased the dry matter accumulation more than other P levels but limited the production and translocation of dry matter to some extent. In N-sufficient (N2, N3) environments, the P2 level increased crop yield and N use efficiency by 11.35% and 37.01%. Unlike P2, none-P (P0) and high-P levels decreased rice dry matter translocation and transport capacity, which further affected N uptake and utilisation in N-sufficient environments. Overall, the combination of the N application rate of 90 kg/ha and P application rate of 13.2 kg/ha, N application rate of 150, 270 kg/ha, and P application rate of 26.4 kg/ha had a high yield; strong nutrient accumulation and transfer ability. It was more inclined to balance N and P, which was beneficial to plant N absorption and utilisation.