Pedosphere 18(4): 496--502, 2008
ISSN 1002-0160/CN 32-1315/P
©2008 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of N and K fertilizers on yield and quality of greenhouse vegetable crops |
LIU Zhao-Hui1 , JIANG Li-Hua1, LI Xiao-Lin2, R. HÄRDTER3, ZHANG Wen-Jun1, ZHANG Yu-Lan1 and ZHENG Dong-Feng1 |
1 Soil and Fertilizer Institute, Shandong Academy of Agricultural Sciences, Jinan 250100 (China);
2 China Agricultural University, College of Agricultural Resources and Environmental Sciences, Beijing 100094 (China);
3 K+S Polska sp. z o.o. Pl. Wiosny Ludów 2, 61-831 Poznan (Poland) |
| ABSTRACT |
| The application of large amounts of fertilizers, a conventional practice in northern China for the production of vegetable crops, generally leads to substantial accumulation of soil nutrients within a relatively short period of time. A fixed field experiment was designed to study the effects of nitrogen (N) and potassium (K) fertilizers applied to optimize the yield and quality of typical vegetable crops. Application of N and K fertilizers significantly increased the yields of kidney bean. The largest yields were obtained in the first and second years after application of 1500 kg N and 300 kg K2O ha-1. In the third year, however, there was a general decline in yields. Maximum yields occurred when intermediate rates of N and K (750 kg N and 300 kg K2O ha-1) were applied. However, no significant differences were observed in the concentrations of vitamin C (VC) in kidney bean among different years and various rates of fertilizer treatments. Yields of tomato grown in rotation after kidney bean showed significant responses to the application of N and K in the first year. In the second year, the yields of tomato were much lower. This suggested that the application of N fertilizer did not have any effect upon tomato yield, whereas application of K fertilizer did increase the yield. Application of K fertilizer was often associated with increased sugar concentrations. |
| Key Words: K fertilizer, N fertilizer, protected cultivation, vegetable quality, vegetable yield |
| Citation: Liu, Z. H., Jiang, L. H., Li, X. L., HÄrdter, R., Zhang, W. J., Zhang, Y. L. and Zheng, D. F. 2008. Effect of N and K fertilizers on yield and quality of greenhouse vegetable crops. Pedosphere. 18(4): 496-502. |
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