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- W2390638262 abstract "In greenhouse tomato production, excessive applications of nitrogen and water have aroused increasing concerns over food safety and groundwater quality. An experiment was conducted in greenhouse to investigate how controlled-release urea at two rates coupled with two levels of irrigation influenced tomato growth, yield and quality as well as soil nitrate contents. The results showed that there was no significant difference in leaf chlorophyll content, stem diameter and fruit width among treatments. Compared with the routine nitrogen application, applying controlled-release urea at normal amount(600 kg N·hm-2)increased single fruit weight, yield, soluble sugar content, sugar to acid ratio and Lycopene by 8.05%~36.1%, 9.02%~36.1%, 15.3%~27.2%, 24.0%~24.4% and 26.4%~81.9%, respectively, but decreased fruit nitrate contents by 5.80%~8.41% and soil nitrate by 20.5%~70.2%. Reducing N supply by 33%(to 400 kg N·hm-2)decreased tomato yield by 17.2%(P0.05)at 800 m3·hm-2of irrigation level(51% of the normal irrigation level). At the two rates of controlled-release urea, reducing irrigation level from 1000 m3·hm-2to 800 m3·hm-2improved tomato lycopene content by 18.2% ~40.6%(P 0.05)and reduced tomato nitrate content by 10.1%~10.9%. However, irrigation at 800 m3·hm-2lead to a reduction(10.1%)of Vc content in tomato at 400 kg N·hm-2of controlled-release urea. It is recommended that controlled-release urea at 600 kg N·hm-2with 800 m3·hm-2or 1000 m3·hm-2irrigation or at 400 kg N·hm-2with 1000 m3·hm-2irrigation could all be used for tomato production. Future research is necessary on effectively reducing soil nitrate." @default.
- W2390638262 created "2016-06-24" @default.
- W2390638262 creator A5081961213 @default.
- W2390638262 date "2014-01-01" @default.
- W2390638262 modified "2023-09-25" @default.
- W2390638262 title "Coupling Effects of Controlled-release Urea and Water on Tomato Yield and Soil Nitrate Under Reduced Irrigation" @default.
- W2390638262 hasPublicationYear "2014" @default.
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