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| DOI：10.13522/j.cnki.ggps.2017.0687 |
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| Impact of Drip Fertigation on Yields and Water Use Efficiency of Wheat-maize Rotation in North China |
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LI Xiaoli, LI Haoru, HAO Weiping, ZHANG Wenying, WANG Chunhui
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Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China; Key laboratory of Dryland Agriculture, MOA, Beijing 100081, China;
Dryland Farming Institute, Hebei Academy of Agricultural and Forestry Science, Hengshui 053000, China;
Soil and Fertilizer Station of Baotou City, Inner Mongolia, Baotou 014010, China
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| Abstract: |
| 【Objective】 This paper aims to study water use efficiency and yields of wheat-maize rotation under drip fertigation in North China. 【Method】 A field plot experiment was conducted from 2015 to 2016 using a randomized complete block split plots. We considered three nitrogen applications: 60%, 100% and 140% of N fertilizer used by local farmers. For each treatment, the N fertilizer was applied to the plots with ①no irrigation, irrigating once or twice to the wheat, ②no irrigation or irrigating twice or three times to the maize; the control was the business as usual as used by the local farmers. 【Result】 Both leaf area index (LAI) and dry mass accumulation increased with fertigation during anthesis, and the yield of the wheat increased with drip irrigation frequency. However, the drip fertigation had no significant impacts on water use efficiency (WUE) and the grain yield. Increasing irrigation frequency led to a rise in leaf area index of the maize during vegetative growth period, but had no significant effect on dry mass accumulation while reducing the WUE. Drip irrigation frequency was found to have a significant impact on grain yield. Compared with the control, drip fertigation increased WUE by 17.2% and 7.2% for wheat and maize respectively. 【Conclusions】 Our findings suggest that there is no significant difference in yields and WUE under different N applications, and reducing N fertilizer application currently used by local farmers by 40% does not lead to a noticeable reduction in grain yield. |
| Key words: fertigation; yield; dry mass; water use efficiency |
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