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| Effects of water saving and nitrogen reduction on tomato growth and utilization rate of water and nitrogen in greenhouse |
| LI Xufeng1, MA Juanjuan1*, SUN Xihuan1,2, SHI Xiaohu1, GUO Xianghong1, LEI Tao1,3 |
| 1. College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 2. Jinzhong University, Jinzhong, Shanxi 030619, China; 3. Key Laboratory of Organic Dry Farming in Shanxi Province, Taiyuan, Shanxi 030031, China |
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Abstract To study the sensitivity of tomato growth to water saving at different growth stages and diffe-rent nitrogen application levels, through the greenhouse plot experiment, four irrigation levels and three nitrogen application levels were set.The response of the above-ground and underground growth indexes to different irrigation and nitrogen application levels was analyzed, and the effect of water saving and nitrogen reduction on water and nitrogen utilization rate of tomatoes was studied. The results show that the plant height, stem diameter and yield of tomatoes decreased with the decrease of irrigation and nitrogen application, all reached the maximum value under the treatment of W1N1(conventional water and nitrogen application). However, the characteristic parameters of the whole root first increased and then decreased with the decrease of irrigation and nitrogen application, the total root length, fine root length, total surface area and total volume of tomatoes were the highest under W2N2 treatment(50% water saving at the seedling stage and 300 kg/hm2 nitrogen application), which were 33%, 34%, 46% and 67% higher than those of W1N1, respectively. Conventional irrigation and nitrogen application will promote the development of root system at the surface layer(0-30 cm), while water saving and nitrogen reduction will make root system deeper. The treatment of W2N2 has the most developed root system, the highest utilization efficiency of irrigation water, and the higher nitrogen fertilizer partial productivity. It is the best combination of water saving and nitrogen reduction in this experiment that water(20%)and fertilizer(25%)resources were saved while slightly reducing production(8%).
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Received: 25 November 2019
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