Effects of nitrogen strategies on nitrogen uptake and utilization and grain quality of broadcast rice under no-tillage with high standing-stubbles.

Effects of different nitrogen levels(0,75,150,225 kg/ha) and dressing ratios(basic N:tiller N:panicle N as 10:0:0,7:3:0,7:0:3 and 4:3:3) on nitrogen uptake,utilization and grain quality of broadcasted rice under notillage with high standing stubble were studied.The results showed that,increasing N application enhanced the nitrogen accumulation of plant and increased the percentage of transferred N in leaves,but reduced N production efficiency and N harvest index and the percentage of transferred N to panicles.Increasing N application also increased the brown rice yield,milled rice yield,head milled rice yield,chalk kernel rate,chalk degree and protein content.And it reduced the peak viscosity and breakdown value,and increased the setback value and pasting temperature of the RVA profile of rice flour.Basic N:tiller N:panicle N ratio 7:0:3 and 4:3:3 had higher N agronomy efficiency,protein content and breakdown value and lower peak viscosity compared to other treatments.