| Cite this article: | 雷宏军,肖哲元,张振华,等.水肥气耦合滴灌提高温室番茄土壤通气性和水氮利用[J].灌溉排水学报,0,():-. |
| LEI Hongjun,XIAO Zheyuan,ZHANG Zhenhua,et al.水肥气耦合滴灌提高温室番茄土壤通气性和水氮利用[J].灌溉排水学报,0,():-. |
|
| |
|
|
| This article has been：Browse 2236Times Download 0Times |
|
|
|
| DOI： |
|
| Water-fertilizer-gas coupled drip irrigation promotes soil aeration, water and nitrogen utilization of greenhouse tomato |
|
LEI Hongjun1, XIAO Zheyuan1, ZHANG Zhenhua2, YANG Hongguang1, LIU Xin1, PAN Hongwei1
|
|
1.School of Water Conservancy,North China University of Water Resources and Electric Power;2.School of Resources and Environmental Engineering,Ludong University
|
| Abstract: |
| 【Objective】Research on the optimal combination of aeration volume, irrigation amount and nitrogen application rate under greenhouse tomato cropping can provide theoretical basis for improving water and nitrogen utilization efficiency for water-fertilizer-gas coupled drip irrigation. 【Method】A two-level randomized block experiment was conducted with three factors, nitrogen application rate (135 and 180 kg/hm2), aeration treatment (subsurface drip irrigation with conventional water and aerated water) and irrigation amount (823 and 1237 m3/hm2). Effects of water-fertilizer-gas coupled drip irrigation on soil aeration, water and nitrogen utilization in greenhouse tomato were explored by systematically monitoring percentage saturation of soil water, oxygen diffusion rate (ODR), oxidation-reduction potential (Eh), mineral nitrogen content and water and nitrogen utilization rate. 【Result】Percentage saturation of soil water decreased at aerated drip irrigation under high amount of irrigation, ODR and Eh were significantly enhanced at aerated drip irrigation under high amount of irrigation. The irrigation amount, nitrogen application rate and aeration amount affected soil mineral nitrogen content significantly at p<0.05. The average soil nitrate and ammonia nitrogen in aeration treatments decreases by 21.4% and 15.5% compared to the conventional drip irrigation. The average soil nitrate and ammonia nitrogen in the high irrigation volume decreases by 22.7% and 14.7% compared to the low irrigation amount. The average value of soil nitrate and ammonia nitrogen in the normal nitrogen application rate decrease by 29.0% and 17.8% compared to the low nitrogen application rate. The average tomato irrigation water use efficiency in the high irrigation amount and normal nitrogen rate decreases by 6.7% and increases by 40.9% compared to the low irrigation amount and low nitrogen rate(p<0.05). The average tomato nitrogen utilization efficiency in the high water and normal nitrogen rate increase by 13.6% and 12.7% compared to the low water amount and low nitrogen application rate(p<0.05). The average tomato irrigation water use efficiency and nitrogen utilization efficiency in the aeration conditions increase by 22.9% and 12.4% compared to the conventional irrigation(p<0.05). 【Conclusion】Water-fertilizer-gas coupled drip irrigation can effectively improve the soil aeration under greenhouse tomato cropping system, increase water and nitrogen utilization efficiencies, promote tomato root growth, and enhance tomato yield. Combination of 180 kg/hm2 application, aerated drip irrigation and irrigation amount of 1237 m3/hm2 is an optimal scheme for water-fertilizer-gas coupled drip irrigation under greenhouse tomato cropping system. |
| Key words: greenhouse tomato; soil aeration; water-fertilizer-gas coupled drip irrigation; irrigation water use efficiency; nutrient utilization efficiency |
|
|
|
|
|
|
