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| DOI：10.13522/j.cnki.ggps.2017.0293 |
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| Effects of Different Water and Fertilizer Treatments on Growth and Yield of Alfalfa under Subsurface Drip Irrigation |
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TONG Bingwei, ZHANG Na, BAO Ziyun
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Ningxia Institute of Water Resources Research, Yinchuan 750021, China
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| Abstract: |
| 【Objective】 Optimize the water and fertilizer supply system of Alfalfa under drip irrigation, a saving and efficient irrigation and fertilization technology scheme was put forward. 【Method】 Alfalfa under subsurface drip irrigation was used as the research object, totally randomized trials of two factors were carried out. The test set 4 irrigation levels (1 950 m3/hm2, 2 400 m3/hm2, 2 850 m3/hm2, 3 300 m3/hm2) and 3 fertilization levels （225 kg/hm2，285 kg/hm2，345 kg/hm2） to explore the effects of water and fertilizer on plant height, stem leaf ratio and hay yield. 【Result】 The plant height increased with the increase of irrigation water and fertilizer amount, and gradually became stable, in which the irrigation level was the main influencing factor. The leaf stem ratio decreased firstly, then increased with the amount of irrigation and fertilization amount, the irrigation level as the main factors, followed by the interaction of water and fertilizer factors, finally fertilization level factors. The hay yield increased firstly and then decreased with the increase of irrigation amount and fertilizer amount, and the yield which was 20 989.75 kg/hm2 was the highest under the irrigation level of 2 850 m3/hm2 and fertilization level of 285 kg/hm2. The effect of interaction of water and fertilizer on hay yield was significant. Under low level of water and fertilizer, the effect of increasing fertilizer amount (irrigation amount) was less, but the effect of moderate water and fertilizer production was remarkable. 【Conclusion】 In this experiment, the interaction of water and fertilizer under the irrigation level of 2 850 m3/hm2 and fertilization level of 285 kg/hm2 is the best. |
| Key words: subsurface drip irrigation; alfalfa; water-fertilizer coupling; growth indicators; yield |
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