Pedosphere 12(2): 171--178, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of water and nitrogen supply on spinach (Spinacia oleracea L.) growth and soil mineral N residues |
| CHEN Qing1, ZHANG Hong-Yan1, TANG Li-Ling1, LI Xiao-Lin1 and H. P. LIEBIG2 |
1 Department of Plant Nutrition, China Agricultural University, Beijing 100094 (China);
2 lnstitute for Fruit Science, Vegetable Science and Viticulte, Hohenheim University, D-70593 Stuttgart (Germany) |
| ABSTRACT |
| Effects of conventional and optimized water and nitrogen managements on spinach (Spinacia oleracea L.) growth and soil mineral N (Nmin) residues were compared in an open field experiment in which water balancemethod and N recommendation with the KNS-system were included. It was shown that the conventionalwater treatment (seasonal irrigated amount: 175 mm) reduced spinach growth compared to the water balancetreatments (seasonal irrigated amount: 80 and 85 mm) at the same N supply level due to N loss through leaching caused by excessive water supply. Although 309 kg N ha-1 was applied in the conventional N treatment, compared to 82 and 66 kg N ha-1 in the optimum N treatments, no significant difference in cropyield was investigated between the N treatments with the same irrigation practice. N uptake in spinach andsoil residual Nmin contents were also significantly affected by the irrigation practices. The conventional water supply not only decreased water use efficiency, but also resulted in excessive NO3--N being leached below the root zone. In order to meet the same target value of N requirement for the next crop, cauliflower, based on the KNS-system, at least extra 50 kg N ha-1 was needed in the conventional water treatments in comparison to the water balance treatment. |
| Key Words: Nmin residue, spinach, water and nitrogen recommendation |
| Citation: Chen, Q., Zhang, H. Y., Tang, L. L., Li, X. L. and Liebig, H. P. 2002. Effects of water and nitrogen supply on spinach (Spinacia oleracea L.) growth and soil mineral N residues. Pedosphere. 12(2): 171-178. |
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