Pedosphere 7(1): 59--64, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of excess fertilizer phosphorus on some chemical properties of paddy soil derived from red soil and its relation to rice growth |
| NI Wu-Zhong1,2 and HE Nian-Zu1,2 |
1 LMCP, Institute of Soil Science, Academta Silica, Nanjing 2100O8 (China)
2 Dept. of Agrochem., Zhejiang Agriculturul University, Hangzhou 310029 (China) |
| ABSTRACT |
| A field experiment with an early rice-late rice rotation was carried out on a paddy soil derived from red soil in the southern part of Zhejiang Province to elucidate the effect of excess P application on some important characteristics of soil properies and its relation to nutrient status and grain yields of rice crops. The experimental results indicated that adequate fertilizer P (15 kg P hm-2 could increase the content of soil available P at the tillering stage of early rice, the contents of N, P and K in the shoots of early rice at primary growth stages, and the grain yield of early rice by increasing valid ears per hectare and weight per thousand grains, which was mainly related to the higher contents of reduced, non-reduced and total sugar in the shoots at the heading stage. And early rice supplied with excessive P could not yield more than that applied with adequate P, due to the reduction in the valid grain percentage and weight per thousand grains. In addition, one-time excess P supply at a rate as high as 90 kg P hm-2 could not improve the soil P fertility in case the soil available P content was lower than the initial (3.74 mg kg-1 soil) after an early rice-late rice rotation, and made a decline in the grain yield increased by per kilogram fertilizer P. Thus, one-time excess P supply should not be adopted for soils with a large P fixation capacity like the paddy soils derived from red soils |
| Key Words: excess phosphorus supply, paddy rice (Oryza sativa L.), paddy soil derived from red soil, phosphorus fertility |
| Citation: Ni, W. Z. and He, N. Z. 1997. Effect of excess fertilizer phosphorus on some chemical properties of paddy soil derived from red soil and its relation to rice growth. Pedosphere. 7(1): 59-64. |
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