激光平地膜上灌溉量和灌溉频率对洋葱耗水量和产量的影响

在激光平地的基础上,进行了灌溉量和灌溉频率对地膜洋葱耗水量和产量影响的裂区试验。结果表明,洋葱产量随灌溉量的增加而下降,最佳灌溉量为420mm,产量达1.26×105～1.31×105 kg/hm2,比灌溉量840mm的处理增产了4.1%～4.8%,节水率达50%。洋葱生育期灌水7次的较灌水14次的产量为高。随着灌溉定额的减小,洋葱耗水量也减小,但相应的产量逐渐增大,水分利用效率较高。洋葱需水量呈抛物线形变化,即生长前期、后期小,中期大,该规律与土壤水分变化相一致。

Effects of Irrigation Amount and Frequency on Water Consumption and Yield of Mulched Onion on Land Graded with Laser Guidance

Split plot design experiments were conducted to study the effects of irrigation amount and timing on onion water consumption and yield on lands graded with laser guidance.The results showed that the yield decreased with increasing water,the yield of the optimal irrigation amount(420 mm) varied between 12.6 and 13.1 ten thousand kg/hm²,4.1%-4.8% higher than the treatments with irrigation amount of 840 mm.This indicated a water-saving rate of 50%.The onion yield with 7 times irrigations was higher than that with 14 times.With the irrigation quota decreased,the onion water consumption was also reduced,while the corresponding yield increased and the efficiency of water was improved.The onion water requirements showed a parabola trend,i.e.,low in the early and final growth stages and high in the middle growth stage,which was consistent with soil moisture variations.