滴灌春小麦的籽粒灌浆特性

为了解滴灌春小麦的籽粒灌浆特性,以新春6号和新春19号为试验材料,应用Logistic方程对畦灌、滴灌以及底墒水+滴灌三种灌溉模式下春小麦籽粒灌浆过程进行了模拟分析。结果表明,底墒水+滴灌、滴灌相对畦灌能够延长春小麦籽粒灌浆持续时间,推迟最大灌浆速率到达时间,尤以底墒水+滴灌作用最明显。灌溉模式对籽粒灌浆各时段参数的影响在品种间也存在一定差异。

Study on Grain filling Properties of Spring Wheat under Drip Irrigation

To explore the grain-filling properties of spring wheat under drip irrigation,we studied the grain-filling properties of two spring wheat cultivars(Xinchun 6 and Xinchun 19) with Logistic equation Y= k /(1+ ae-bT) and three irrigation modes,i.e.flood irrigation,drip irrigation and soil moistures before sowing with drip irrigation at Experimental Station of Shihezi University.The results were as follows: the grain filling regulation accorded with "S" type of growth curve of "slow-fast-slow" under different irrigation modes,which could be simulated by Logistic curve.Compared with flood irrigation,the grain-filling duration of drip irrigation and soil moistures before sowing with drip irrigation were longer,especially under the condition of soil moistures before sowing with drip irrigation.However,with the extension of grain-filling duration,the grain-filling rate reduced.Irrigation modes brought different effect on grain-filling parameters;meanwhile,the influence had obvious difference between the two cultivars.Correlation and gradually regression analysis showed that grain weight had significant and positive correlation with grain filling duration,rapid increase period duration and slight-increase period duration,but didn’t have significant correlation with the other parameters.Therefore,under different irrigation modes,the way of extending grain-filling duration under the premise of grain-filling rate keep stability played an important role on improving grain weight.