灌溉定额对膜下滴灌木薯产量及土壤理化性状的影响

通过研究不同灌溉定额对膜下滴灌木薯块根产量及土壤理化性状的影响，为推广木薯膜下滴灌技术提供科学依据。以木薯品种‘新选048’为试材，设置450、750、1200 m3/hm2 3种灌溉定额，以0 m3/hm2为对照，对各处理土壤理化性状、木薯生长状况和产量进行研究。结果表明：随着灌溉定额的增加，土壤含水率、孔隙度、气相比例、速效氮、磷、钾含量均显著增加，木薯株高、茎粗、产量及经济效益也均显著提高。其中，450、750、1200 m3/hm2 3种灌溉定额的木薯块根产量分别比CK增加了46.22%、75.60%、93.45%，经济效益分别增加了19.24%、26.46%、61.07%。可见，膜下滴灌条件下增加灌溉定额，可有效改善土壤理化性状，提高木薯产量和经济效益，其中灌溉定额以1200 m3/hm2处理效果最好，在木薯生产上值得推广应用。

Irrigation Quota Under Mulched Drip Irrigation: Effect on Cassava Yield and Physical and Chemical Properties of Soil

Studies on effect of cassava yield and soil physical and chemical properties by the different irrigation quota under mulched drip irrigation to provide scientific basis for popularization of mulched drip irrigation. The experiment using ‘Xinxuan 048’ (a cassava cultivar in Guangxi), with treatments of three irrigation quotas (450 m3/hm2, 750 m2/hm2, 1200 m3/hm3) and CK (0 m3/hm3) were studied the soil physical and chemical properties, cassava growth and yield. The results showed that the water content, total porosity, gas phase ratio, available nitrogen, phosphorus and potassium content of soil increased significantly with the increase of irrigation quota, and the height, stem diameter, yield and economic benefit of cassava also increased significantly. Compared with CK, the yield of 450 m3/hm2, 750 m3/hm2 and 1200 m3/hm2 increased respectively by 46.22%, 75.60% and 93.45%, and the economic benefit increased respectively by 19.24%, 26.46%, 61.07%. In short, the soil physical and chemical properties can be improved obviously by increasing irrigation quota under mulched drip irrigation, and cassava yield and economic benefits also can be improved. Among all the treatments, 1200 m3/hm2 treatment presents the optimal effects and is worth popularizing in cassava production.