Effect of N Application with Different Level on Characteristic and Yield of Hybrid Rice Population
[Objective] The purpose was to explore N fertilizer need law and various population quality indices under super-high yield. [Method] With hybrid rice variety Qyou 1 as tested material and 251.7 kg/hm2 as standard N application rate (ST), 5 treatments of N application were set up to compared the different N application rate on the yield and population quality in rice under precise quantity planting. [Result] The ears per unit area varied slightly in N application range of ST± 15% and all decreased below or over this N application range. Among 5 treatments of N application, the spikelet number per ear differed lilltle, the seed setting rate and 1000-grain weight were highest in ST treatment, the seedlings in peak stage and effective ears were highest in ST- 15% N application treatment, the earbearing tiller rate was highest in ST and ST+ 15% N application treatment, the maximum LAI and storage material output amount and output rate in the stem-leaf sheath were highest in ST N application treatment and the contribution to rice yield was highest in ST- 15% N application treatment. The leaf length order of 5 leaves in wheat showed high yield trend in ST and ST+ 15% N application treatment. The dry matter accumulation from full heading to mature stage was highest in ST N application treatment. [Conclusion]The optimum N application rate for getting high yield in Qyou 1 was 256.4 kg/hm2.
国家科技期刊平台
NSTL
万方数据
维普
