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| Effects of Nitrogen Rates on Tomato Yield and Quality and Soil Nitrate Accumulation Under Drip Irrigation in Solar Greenhouse |
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| KeyWord:tomato; nitrogen application rate; soil nitrate; yield; nutritional quality |
| Author Name | Affiliation | | BI Xiao-qing | Institute of Plant Nutrition and Natural Resources，Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | SHAN Nan | Institute of Plant Nutrition and Natural Resources，Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | DU Lian-feng | Institute of Plant Nutrition and Natural Resources，Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | AN Zhi-zhuang | Institute of Plant Nutrition and Natural Resources，Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | ZHAO Tong-ke | Institute of Plant Nutrition and Natural Resources，Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | ZHANG Cheng-jun | Institute of Plant Nutrition and Natural Resources，Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China |
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| Abstract: |
| Soil excessive nitrogen（N） causes nitrate pollution in water. Optimal N fertilizer would maintain plant yield and improve water quality. A field trial was carried out to examine the effects of six N application rates（0、90、180、270、360、450 kg N·hm-2） on yield and quality of tomatoes and soil nitrate accumulation in solar greenhouses with drip irrigation in Shunyi District, Beijing. Tomato yield was highest at 360 kg N·hm-2. The highest ratio of soluble sugar to titratable acid contents in tomato fruit was observed at 450 kg N·hm-2. Soil nitrate concentration increased significantly with increasing N application rates, particularly when the rates exceeded 270 kg N·hm-2. These results suggest that the N application rates of 270~360 kg·hm-2, 60%~80% of the typical N application rate, would be optimal for tomato growth and soil nitrate control under drip irrigation in greenhouses. This represents a 20%~40% reduction of the typical N application rate of 450 kg·hm-2, and a significant improvement in tomato yield and quality and a reduction in the risk of nitrate release into environment. |
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