不同干旱强度对糜子产量的影响及其在估产中的应用

Effect of Different Degree Drought on Proso Yield and Its Application in Yield Estimation

该文利用盆栽试验结果，通过分析糜子在不同生育阶段受不同强度干旱的产量反应，得出：糜子各生育期的受旱缺水指数ｒ＿ｉ，减产指数Ｒｉ，及产量反应系数Ｋｙｉ。认为糜子在灌浆期对干旱敏感性最强，此阶段受旱，日减产率最大，水分生产力最低，灌水效果最佳。拔节＋扬花期产量和干旱之间的反应最弱。糜子生育期耗水以分蘖期最多，占总量的２８．６％，正常供水盆栽全生育期耗水１８５ｍｍ，不同干旱强度下为１６７ｍｍ。水分生产力平均约０．５ｋｇ／ｍｍ。并用ｒｉ、Ｒｉ、Ｋｙｉ对生产中的估产模式、及产量进行了检验，结果良好。同时还对生物产量反应进行了分析。

Based on pot experiment ,Proso yield response to different droughts in five growing periods was analysed,thewater deficits index( ri )and the drop productivity index(Ri)and the preductivity response index(Kyi)were ob-tained. The results show that:grain-filling stage was the most sensitive stage response to drought.When drought oc-cured in the stage,the daily drop product was the highest and the water use efficiency was the lowest. It is also inthis stage that irrigation is the most effective. In shooting and anthesis stage,the reaction between yield and droughtis very little,The evaptranspiration(ET)in tilling stage is the highest,about 28.6%of total ET. The normal evap-transpration in pot experiment was up to 185mm and in droughts was 167mm,and mean WUE was 0.5Kg/mm inthe experiment of drought treatment.ri,Ri,Kyi were used to foretell the proso yield.The estimated result was veryclose to the real yield, also the biomass response to drought was anslysed in the paper.