UTILIZATION OF FERTILIZER PHOSPHORUS BY WHEAT AND RICE FROM DIFFERENT SOILS
Wheat and rice were grown in a greenhouse on different soils collected from all over the country. Tagged superphosphate was applied at different doses. About fifty percent of these soils responded to phosphorus fertilization. Percent utilization of fertilizer phosphorus applied to these soils varied from 8 to 16, 2 to 9, and 2 to 20 in case of wheat, early paddy and late paddy, respectively. Degrees of phosphorus unsaturation in these soils were determined by Piper's method. The extent of unsaturation was calculated. The unsaturation percentages were found to correlate significantly at 1% level with percentage utilization of labelled superphosphate. It appears that the amount of phosphate the plant can take is limited by the degree of saturation of the exchange complex and that the complex serves as a competing system for available phosphorus and plays an important role in the phenomenon of contact exchange in phosphate nutrition. (C.H.)
- Research Organization:
- Indian Agricultural Research Inst., New Delhi
- NSA Number:
- NSA-13-006260
- OSTI ID:
- 4270429
- Report Number(s):
- A/CONF.15/P/1947
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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