| Analysis of soil water and salt characteristics in farmland of spring maize under mulched drip irrigation in Hexi Region of Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2017.02.35 |
| Key Words: mulched drip irrigation spring maize farmland irrigation quota water and salt movement yield |
| Author Name | Affiliation | | YANG Hong-wei | Basin Management Bureau of Shiyang River, The Water Resources Department of Gansu Province, Wuwei, Gansu 733000, China | | YANG Zheng-hua | Basin Management Bureau of Shiyang River, The Water Resources Department of Gansu Province, Wuwei, Gansu 733000, China | | HOU Shu-mei | Seventh Middle School of Wuwei, Wuwei, Gansu 733000, China | | WANG Zeng-li | Central Irrigation Experiment Station of Wuwei, Wuwei, Gansu 733000, China | | ZHANG Fu-cang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Through the observation of soil water and salt in the farmland of spring maize under mulched drip irrigation in Hexi Region of Gansu Province, the characteristics of soil moisture and salt dynamic change, and the yield and water use efficiency of maize were analyzed. The results showed that the distribution of soil moisture content in different soil profiles at different growth stages was opposite to that of salt content, i.e., in the soil profiles where there was a high salt content, there was a low moisture content. The salt accumulation at the interval of drip pipes was significantly higher than that at the interval of emitters. Under the irrigation quota of 480 m3·hm-2, the irrigated water moved significantly along vertical direction and the deep leakage was remarkable; under the irrigation quota of 420 m3·hm-2, the irrigated water moved significantly along horizontal direction in different depth, being beneficial to the absorption and utilization of crop. Mulched drip irrigation could significantly reduce soil salt content in 0～40 cm profile, while the profile of 40～100 cm was the accumulating zone of salt during drip process. Under the irrigation quota of 420 m3·hm-2, the yield and water use efficiency of spring maize were relatively high. Therefore, from the viewpoint of water and salt environment as well as efficient water-saving, the benefit of the irrigation quota of 420 m3·hm-2 was the best. |
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