| 引用本文: | 于晓琦,黄月娇,王晓明.水氮调控对轻度盐化土膜下滴灌棉花根干重的影响[J].灌溉排水学报,0,():-. |
| yuxiaoqi,huangyuejiao,wangxiaoming.水氮调控对轻度盐化土膜下滴灌棉花根干重的影响[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【导言】为探究干旱区轻度盐化土条件下水氮调控模式对膜下滴灌棉花根干重的影响规律。【方法】开展轻度盐胁迫（4-5 g/kg）下膜下滴灌棉花水氮调控对根系干重的影响研究，设置3个施氮水平：300、600和900 kg/hm2（分别标记为N1、N2、和N3)和3个灌水水平：2750、3750和4750 m3/hm2（分别标记为W1、W2和W3）共9个试验处理，分析膜下滴灌棉花根干重及根干重密度的差异性变化。【结果】结果表明，水分对根干重的作用较氮素明显。相同施氮水平下，根干重随灌水量增大先增后减。根干重在0-40 cm土层中随土层加深而减小，适当增加灌水量和施氮量可以促进30 cm以下土层中根干重增加；而在水平方向上，根干重在距离滴头较近的范围内明显增大。灌水量偏低时，根干重在距离滴头较远的水平范围内较其他灌水处理有明显减小的趋势；水氮互作效应对根干重密度的影响达到极显著水平(P<0.01)，随着施氮量的增加，根干重密度随着土层深度和水平方向的增加而下降。【结论】综合来看，氮素对根系的影响效应受土壤中水分状况的限制，高氮对根系生长有明显的负作用。 |
| 关键词: 轻度盐化土；滴灌棉花；水氮调控；根干重 |
| DOI： |
| 分类号:S562 |
| 基金项目:宁夏回族自治区教育厅教学改革项目(2018SFZY32) |
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| Effects of water and nitrogen regulation on root dry weight of cotton under drip irrigation with slight saline soil |
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yuxiaoqi,huangyuejiao,wangxiaoming
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Yinchuan University of Science and Technology
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| Abstract: |
| 【Objective】In order to study the effect of water and nitrogen regulation on cotton root dry weight under drip irrigation in slightly saline soil.【Method】 a three-level barrel experiment was conducted under light salt stress (4-5 g/kg) and drip irrigation. Using local cotton variety "Nongfeng 133", the dry weight of cotton roots under drip irrigation at three levels of 300, 600 and 900 kg/hm2 (marked N1, N2, and N3 respectively, supplemented with urea) and 2 750, 3 750 and 4 750 m3/hm2 (marked W1, W2 and W3 respectively) were studied. 【Result】The results showed that the effect of water on root dry weight was more obvious than that of nitrogen. Under the same nitrogen level, the root dry weight increased first and then decreased with the increase of irrigation amount. The effect of normal irrigation on root matter accumulation was better. In the vertical direction, the root dry weight decreases with the depth of 0-40 cm soil layer, and increases near the bottom of the bucket. Proper increase of irrigation amount and nitrogen application can increase root dry weight in soil below 30 cm. In the horizontal direction, the root dry weight increased significantly in the vicinity of the distance from the emitter. When the irrigation amount was low, the root dry weight decreased obviously in the horizontal range far from the emitter. Increasing nitrogen application is not conducive to increasing root dry weight in horizontal direction. With the increase of soil depth, the root dry weight density decreased, and changed rapidly in 0-30 cm soil layer. The root dry weight density increased in the bottom soil layer limited by barrel height. Appropriate increase of nitrogen application rate will increase root dry weight density. The effect of water and nitrogen interaction on root dry weight density reached a very significant level (P<0.01). 【Conclusion】Generally speaking, The effect of nitrogen on root system is limited by the water condition in soil. High nitrogen has a significant negative effect on root growth |
| Key words: lightly salted soil; drip irrigation cotton; water and nitrogen regulation; root dry weight |
