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| DOI： |
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| The Timing of Application of Nitrogen in Drip Fertigation Affects Yield, Quality, as Well as Water and Nitrogen Use Efficiency of Cauliflower |
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WU Yuheng， WU Wenyong， HAN Yuguo， LIAO Renkuan， YANG Linlin
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School of Soil and Water Conservation，Beijing Forestry University， Beijing 100083， China; Department of Irrigation and Drainage，China Institute of Water Resources and Hydropower Research，Beijing 100044， China; Beijing Vocational College of Agriculture， Beijing 102442， China
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| Abstract: |
| Increasing nitrogen use efficiency in producing vegetables from greenhousesis essential in China, and in this paper, we investigated the impact of the timing of fertigation on yield, quality, water and nitrogen use efficiency of cauliflower using plot experiments. Four fertigation timings were examined: 1/5N-4/5W (T1),1/5W-1/5N-3/5W (T2), 2/5W-1/5N-2/5W (T3), 3/5W-1/5N-1/5W (T4), in which 1/5W, 1/5N and3/5W represented irrigating water at the first fifth of a irrigation/fertigation event, applying the nitrogen at the second fifth of the event, flashing the irrigation pipe in the last three fifths of the event, respectively. The results showed that the total water consumption increased first and then decreased as the fertigation was delayed, peaking in T3 with a water consumption of 135.26 mm. The timing of the fertigation had a significant effect on yield and quality, with the yield increasing by slightly delaying the nitrogen application. Applying the nitrogen in the late stage (T3 and T4) increased the yield by 1.78%~6.39%, compared with application at the beginning stage (T1 and T2). Water use efficiency, nitrogen use efficiency and recovery efficiency, as well as the percentage of nitrogen in the ball-flower all increased by delaying the nitrogen application to later stage. Delaying the nitrogen application also reduced nitrate leaching. In summary, our experimental results showed that delaying nitrogen application in fertigation increased yield, quality, water and nitrogen use efficiencies. |
| Key words: fertilization time； yield； quality； water and nitrogen use efficiency； nitrogen distribution |
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