Record Details

Title:
Ecological studies on nitrogen fixation of soybean nodules in Kao-Ping area of the South Taiwan (II) The interaction between soil factors and nodular effectiveness of soybeans
Publication date:
1984
Summary:
The relationship between effectiveness of soybean nodules and soil factors were evaluated during a five-year study. Soil samples were collected from 616 locations in the Kao-Ping area. Annual rice straw mulching practice in the area resulted in enriching soil organic matter contents (OM). However, a heavy supply of 20-50 kg N/ha tended to increase total nitrogen (TN) and total exchangeable nitrogen (TEN) of soil. The increases in nodular effectiveness were related to the concomitant increases in soil OM, but inverted to decrease in soil TN. It was apparent that nodular effectiveness was severely retarded when soil TEN was over 37 ppm. Besides, acidic soil also played a role to lower nodular effectiveness while soil pH value was less than 5.2. The pH value of soybean rhizosphere was 0.6 unit in average higher than that from surface soil. This extra 0.6 unit significantly affected nodular effectiveness. The above results indicated that heavier nitrogen application and acidic soil were of two major factors which reduced nodular effectiveness. [AS]
Call number:
A:PS
Journal citation:
v.11(12-2):1419-1430, NATIONAL SCIENCE COUNCIL MONTHLY
Contact information:
harvest@worldveg.org

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 Record created 1985-04-30, last modified 2019-03-04


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