不同地力条件下氮肥施用量对水稻生产力的影响

Effects of Nitrogen Fertilizer Application on Rice Productivity under Two Soil Fertility Conditions

[目的]筛选出适宜安徽水稻生产的氮高效品种。[方法]以两优100、广两优6308和两优培九为试验材料,探讨高、低土壤地力下5个氮肥水平对水稻生产力的影响。[结果]随着施氮量的增加,2个地力水平下不同水稻品种的产量均呈先上升后下降的趋势。无论在高肥力土壤还是低肥力土壤,0、52、104 kg/hm^2水平下两优100和广两优6308的产量均显著高于两优培九;不同品种的产量差异主要由有效穗数和穗粒数共同决定的。以两优培九最佳经济产量为目标产量时,选择种植两优100或广两优6308可至少节约氮肥14.4%~18.5%。[结论]两优100和广两优6308在生产中具有较大的节肥潜力,将为安徽水稻高效优质生产提供技术支撑。

[ Objective] To screen out rice varieties with high nitrogen utilization efficiency in Anhui Province. [ Method] With Liangyon 100, Guangliangyou 6308 and Liangyoupeijiu as the test materials, we discussed the effects of five nitrogen levels on rice productivity under high and low soil fertilities. [ Result ] With the increase of nitrogen application, yields of different rice varieties on two soil fertilities firstly enhanced and then decreased. Under both high and low soil fertilities ,yields of Liangyou 100 and Guangliangyou 6308 at 0,52 and 104 kg/hm2 nitrogen levels were significantly higher than that of Liangyoupeijiu ; the differences in yield were determined by the number of productive ear and the kernels per spike. When taking the optimal economic yieldt least save nitrogen fertilizer of Liangyoupeijiu as the target yield, planting Liangyou 100 or Guangliangyou 6308 could aby 14.4% - 18.5%. [ Conclusion] Liangyou 100 or Guangliangyou 6308 has relatively greater potential in fertilizr saving in production, and this research provides technical support for the rice high quality and efficiency production in Anhui Province.