Pedosphere 1(4): 371--376, 1991
ISSN 1002-0160/CN 32-1315/P
©1991 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Human Activity and Soil Fertility-Nutrients Depletion of Arable Soils in China |
| LU RU-KUN |
| Institute of Soil Science, A cademia Sinica, Nanjing 210008 |
| ABSTRACT |
| The reserve of soil nutrients is limited. In case of irrational use of land, nutrients would be depleted sooner. Before the 1950s the low grain production in China was maintained only by expanding the cultivated area and by recycling of nutrients in agriculture. Calculation of nutrients balance showed that in the year of 1949 there were great deficits of N, P and K elements in agriculture of China. It revealed that there would have really been danger of soil nutrients exhaustion if such a situation had continued. Things have changed since the beginning of 1950s. The nutrients balance in agriculture has been getting better and better. In the year 1987 N and P balance got rid of their great deficits. |
| Key Words: |
| Citation: Lu, R. K. 1991. Human Activity and Soil Fertility-Nutrients Depletion of Arable Soils in China. Pedosphere. 1(4): 371-376. |
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