不同氮素水平对糯高粱物质生产及氮素利用特性的影响

Effects of Differrent Nitrogen Level on Material Production and Nitrogen Use Characteristics in Glutinous Sorghum

以糯高粱黔高8号为研究对象,设置不同的氮素水平,对糯高粱的物质生产及氮素利用特性进行研究,结果表明:糯高粱的产量、干物质积累总量和氮素积累总量随氮素水平的提高呈现先增加后降低的趋势,增施氮素较不施氮素能够显著提高糯高粱的产量、干物质积累总量和氮素积累总量,其中以N150处理增幅最大;高氮素处理N300和N450较N150处理的糯高粱干物质生产效率、氮素收获指数、氮素表观回收率、氮素农艺效率、氮肥农学利用率、氮肥利用率和氮肥偏生产力都有不同程度的降低,说明高氮素水平下,氮素利用效率较低,氮肥损失较高。综合考虑,贵州省贵阳地区糯高粱施氮量以稍高于150kgN/hm^2为宜。

The glutinous sorghum cultivar Qiangao nitrogen utilization characteristics were studied under 8 was used as research object and the material production and different nitrogen levels. The results showed that the yield, drymatter accumulation and total nitrogen accumulation presented the trend of increasing first and then decreasing with the increase of nitrogen level. Compared with no nitrogen application treatment, the yield, dry matter accumulation and total nitrogen accumulation of glutinous sorghum significantly increased with nitrogen application, the treatment of N150 was the largest increase; Compared high nitrogen treatment N300 and N450 with N150, the dry matter production efficiency, nitrogen harvest index, nitrogen apparent recovery rate, nitrogen agronomic efficiency, nitrogen fertilizer agronomic efficiency, nitrogen use efficiency and nitrogen partial factor productivity had different degrees of reduction, showing that the nitrogen use efficiency was low and the nitrogen fertilizer lose more under high nitrogen level. Comprehensive consideration, the suitable application rate hm2 in glutinous sorghum in Guiyang area of Guizhou Province. of nitrogen fertilizer was a little higher than 150kgN/