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大豆科学  2014 

不同滴水处理对大豆根系生长及耗水特性的影响

DOI: 10.11861/j.issn.1000-9841.2014.06.0848, PP. 848-852

Keywords: 滴水量,大豆,根系,耗水特性

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Abstract:

为揭示滴水量对大豆根系生长的影响规律,以中黄35为材料,采用管栽方法研究了9次(W1)、11次(W2)、13次(W3)、15次(W4)4种滴水处理(总滴水量依次为21.0,25.8,30.6,35.4kg.管-1)对0~100cm土层含水量、根系干重分布和耗水等的影响。结果表明:随着滴水次数和总滴水量增加,直接增加0~40cm土层含水量,间接减少40~100cm土层贮水消耗量,增加总耗水量;开花前滴水抑制开花前40~60cm、60~80cm土层根系生长,增加开花结荚期滴水次数和总滴水量明显促进花荚期20~40cm、40~60cm、60~80cm土层根系生长,增加结荚至成熟期根系总量,提高根系伤流量和0~20cm土层根系活力,提高产量、产量与根干重比值和水分利用效率。因此,花前15d适度干旱促进根系生长,开花期后增加滴水次数和总滴水量可促进根系生长,提高产量和水分利用效率;少量多次滴灌方式不利于40cm以下土层大豆根系生长。

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