Journal of Nuclear Agricultural Sciences ›› 2020, Vol. 34 ›› Issue (6): 1302-1310.DOI: 10.11869/j.issn.100-8551.2020.06.1302

• Isotope Tracer Technique·Ecology & Environment·Physiology • Previous Articles     Next Articles

Photosynthetic Source Dynamics and Yield Performance of High Density Maize With Reduced Amount of Water and Nitrogen in Oasis Irrigation Region

ZHANG Xijun1, WEI Tingbang2, FAN Zhilong1, CHAI Qiang1, *   

  1. 1 Agricultural College of Gansu Agricultural University/Key Laboratory of Arid Habitat Crops of Gansu Province, Lanzhou, Gansu 730070;
    2 Agricultural Engineering Technology Research Institute of Gansu Province, Wuwei, Gansu 733006
  • Received:2018-12-13 Revised:2019-02-24 Online:2020-06-10 Published:2020-04-19


张喜军1, 魏廷邦2, 樊志龙1, 柴强1, *   

  1. 1 甘肃农业大学农学院/甘肃省干旱生境作物学重点实验室,甘肃 兰州 730070;
    2 甘肃省农业工程技术研究院,甘肃 武威 733006
  • 通讯作者: 柴强,男,教授,主要从事旱地与绿洲农作制研究。
  • 作者简介:张喜军,男,主要从事旱地与绿洲农作制研究。
  • 基金资助:

Abstract: In order to further explore the higher density of maize in Hexi Oasis Irrigation Area, whether high yield can be obtained under the condition of water and nitrogen reduction, the photosynthetic potential, dry matter accumulation, grain yield and yield composition of maize during growth period were determined. The field experiment designed traditional irrigation (W1) and growth period reduction 20% irrigation (W2), high nitrogen application (450 kg·hm-2, N1), reduction of 30% nitrogen application (300 kg·hm-2, N2) and three planting density of 75,000 plants·hm-2 (D1), 97,500 plants·hm-2 (D2) and 120,000 plants·hm-2 (D3). The results indicated that no significant difference was found in the photosynthetic potential of W2N2 and W1N1 corn in the late growth stage. Under the W2N2 treatments, the photosynthetic potential of D2 increased by 8.7% compared with D1 during the whole growth period of the maize. There was no significant difference between D2 and D3. The dry matter accumulation of W2N2 was eventually equal to W1N1 at a low amount of water and nitrogen conditions. The dry matter accumulation of D2 increased by 21.1% compared with D1 during the whole growth period of maize and no significant difference was found between D2 and D3. The grain yield of W2N2D2 was the same with that of W1N1D2. The dry matter accumulation of D2 increased by 9.0%~33.7% compared to that of D1 treatment. Irrigation and nitrogen applications had no significant effect on the grain number per ear and 1000-grain weight of maize. Under the same water and nitrogen conditions, the grain number of D3 corn compared with D1 decreased by 5.9%~26.1%, and the 1000-grain weight of corn decreased by 9.2%~12.3%. In conclusion, W2N2D2 still maintained a large photosynthetic potential of maize under reduced irrigation and nitrogen application at the later stage of growth, which provides material guarantee for the formation of corn yield, thus obtaining high yield. Therefore, maize planting with plant density of 97,500 plants per hm-2 in a condition of reduced 20% irrigation and 30% nitrogen application can be recommended as a technical reference.

Key words: oasis irrigation region, reduced amount of water and nitrogen application, density, photosynthetic potential, grain yield

摘要: 为进一步探索河西绿洲灌区玉米在水、氮减量的条件下能否支撑较高的种植密度而获得高产,本研究通过大田试验,设置传统灌水(W1)和生育期减量20%灌水(W2)2个灌水梯度,高施氮(450 kg·hm-2,N1)、减量30%施氮(300 kg·hm-2、N2)2个施氮水平和D1(7.5万株·hm-2)、D2(9.75万株·hm-2)、D3(12万株·hm-2) 3个种植密度,在不同种植密度条件下,采用水氮耦合组合,测定玉米生育期内光合源动态、干物质积累、籽粒产量和产量性状。结果表明,在生育后期W2N2玉米光合势(LAD)与W1N1无显著差异,在W2N2条件下,D2的LAD较D1在玉米全生育期内平均增加8.7%,D2与D3之间无显著性差异;在W2N2条件下,玉米干物质积累量最终与W1N1持平,D2干物质积累量较D1在玉米全生育期内平均增加21.1%,D2与D3之间无显著性差异;D2玉米籽粒产量在W2N2与W1N1间保持同等水平,较D1玉米籽粒产量提高9.0%~33.7%;灌水和施氮因素对玉米穗粒数和千粒重影响均不显著,而在同等水、氮条件下,D3玉米穗粒数较D1降低了5.9%~26.1%,千粒重降低了9.2%~12.3%。综上,D2水平使减量灌水、减量施氮条件下的玉米在生育后期仍然保持较大的LAD,为玉米产量的形成提供了物质保障,从而获得高产。本研究结果为通过水氮减施实现资源节约的高效农业生产提供了技术参考。

关键词: 绿洲灌区, 水氮减施, 密度, 光合势, 产量