根系分区交替灌水对玉米吸收养分影响的初步研究

Preliminary Study on Effects of Roots-Divided Alternate Irrigation on Nutrient Uptake by Maize

摘要: 通过盆栽试验研究了交替灌水方式、固定灌水方式和常规灌水方式对玉米吸收养分的影响。结果表明,拔节前期交替方式N吸收总量比固定方式高,和常规灌水方式相差不大,而后期则比固定、常规方式高;交替方式磷吸收总量均比其它两种方式高。交替方式氮、磷利用效率比常规方式分别提高25.1%,25.3%。交替方式比常规方式节约灌水量10.3%,其水分利用效率最高,比常规方式增加20.1%。

Abstract: Effects of roots divided alternate irrigation on nutrient uptake were studied with controlled alternate irrigation (CAI) for half part of root zone, controlled fixed irrigation (CFI) for half part of root zone and conventional irrigation (CI) for whole root zone. The results showed total N uptake of CAI was higher than that of CFI, but there is no difference compared with CI at early jointing stage. But at the end of maize development, the total N uptake of CAI treatment was higher than that of CFI and CI. And total P uptake in CAI treatment was higher than that of the other two irrigation methods. Compared with CI treatment, plant N and P use efficiency in CAI treatment was enhanced by 25.1% and 25.3%, respectively. In CAI treatment, irrigation water was saved by 10.3% compared with CI, water use efficiency was the highest among the three irrigation treatments, and increased by 20.1% compared with CI.