浅埋滴灌下水氮减量对春玉米干物质积累及水氮利用效率的影响

2017～2018年,以传统畦灌常规施氮为对照,采用大田裂区试验,以传统畦灌常规灌量40%(W1)、常规灌量50%(W2)、常规灌量60%(W3)为主处理,以常规施氮量50%(N1)、常规施氮量70%(N2)、常规氮施量(N3)为副处理,研究浅埋滴灌下水氮减量对春玉米干物质积累及水氮利用效率的影响。结果表明,浅埋滴灌下玉米干物质积累量、各器官干物质转运量及其对子粒贡献率均随着水、氮水平的增加而增加,子粒产量W3N3处理与W3N2、W2N3、W2N2差异不显著,显著高于其他处理和CK。灌溉水利用效率各处理显著高于CK;氮肥偏生产力N1和N2水平显著高于CK,N3水平与CK无差异;氮吸收效率W3N2最高,除W3N1和W2N1外,显著高于其他处理和CK。

Effect of Reduction of Nitrogen and Irrigation on Dry Matter Accumulation and Utilization Efficiency of Water and Nitrogen of Spring Maize in Shallow Drip Irrigation

Effect of reduction of nitrogen and irrigation on dry matter accumulation, utilization efficiency of water and nitrogen of spring maize in shallow drip irrigation were studied by using the traditional border irrigation cooperated with the conventional nitrogen application as the control from 2017 to 2018. The experiment was adopted a split plot design, and the main treatment including 40%(W1), 50%(W2) and 60%(W3) of conventional irrigation and the secondary treatment including 50%(N1), 70%(N2) of conventional nitrogen fertilization and conventional nitrogen fertilization(N3). The results showed that the dry matter accumulation, dry matter transport of organ and its contribution rate to grain of each treatment improved with the increase of irrigation and nitrogen level, The yield of W3N3 there was no significant difference with W3N2, W2N3 and W2N2, which were significantly higher than that of other treatments and CK. Utilization efficiency of irrigation water of each treatment was significantly higher than that of CK; nitrogen partial productivity of N1 and N2 were significantly higher than that of CK while there was no significant difference with CK under the N3 level; efficiency of nitrogen absorption of W3N2 was the highest, which were significantly higher than other treatments and CK, except for W3N1 and W2N1.