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| Effects of Nitrogen Supply Levels on Greenhouse Tomato Growth and Nitrogen Utilization in Beijing Region |
| Bai You ai~1; He Jiande~2; Chen Qing~1; et al. |
| 1 Key Laboratory of Plant Nutrition; MOA; Key Laboratory of Plant-Soil Interactions; MOE; Department of Plant Nutrition; China Agricultural University; Beijing 100094; 2 Beijing Agricultural Bureau |
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Abstract The effect of different nitrogen supply levels on tomato growth and nitrogen utilization were studied in the greenhouse of Beijing region in spring. The results showed that the marketable yield was highest when nitrogen applied rate was 225 kg·hm~(-2). However, the tomato yield decreased with applied N rate increasing. There was no significant effects on N、P、K uptake between applied nitrogen rates. In this experiment the optimum N supply level for greenhouse tomato in protected field(Extension Service Cente...
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Received: 26 April 2003
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