拔节期灌水对冬小麦根重与产量的影响

用盆栽的方法,在土壤养分一致的条件下,测定了15个冬小麦品种拔节期灌水与不灌水(对照)的生物产量和籽粒产量。结果表明:冬小麦有效穗数、生物产量以及籽粒产量的形成与拔节期的水分状况有密切关系;地下部的根干重与地上部的生物产量、地上部的生物产量与籽粒产量呈显著正相关,其相关程度与拔节期灌水与否有关;地上部生物产量与千粒重虽也呈正相关,但相关性大小与拔节期的水分条件关系不密切。拔节期灌水处理与不灌水(对照)冬小麦的地上部生物产量、籽粒产量和千粒重的差值,与冬小麦自身的抗旱指数呈反相关。

Effects of Jointing Stage Irrigation on Root Weight and Yield of Winter Wheat Varieties

Under the consistent soil nutrients,biomass and grain yield of fifteen winter wheat varieties the with irrigation and non-irrigation control at jointing stage were measured using the pot cultivation.The results showed: there were tight relationships between formations of the effective spike number, above ground biomass, under ground biomass as well as grain yield and water condition at jointing stage.There were significant positive correlations between underground dry root weight and above ground biomassas well as that between above ground biomass and grain yield,which were closely related to the water conditions at jointing stage.Although there was positive correlation between above ground biomass and thousand grains weight,the relationship between correlation degree and water condition at jointing stage was not close.There were negative correlations between the differences of above ground biomass, graind yield, thousand grains weight of irrigation treatment and control at jointing stage and DI(drounght resistance index)of the winter wheat varieties.