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V. Geethalakshmi

Tamil Nadu Agricultural University Coimbatore, INDIA

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SOLUBILIZATION OF PHOSPHORUS FROM LOW-GRADE UDAIPUR ROCK PHOSPHATE USING SPENT WASH.

Kiran Kumari, V.K. Phogat

Affiliations

¹Department of Soil Science, CCS HAU, Hisar, Haryana, 125001.

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Cite article:- Kumari Kiran, Phogat V.K. (2025). SOLUBILIZATION OF PHOSPHORUS FROM LOW-GRADE UDAIPUR ROCK PHOSPHATE USING SPENT WASH.. Indian Journal of Agricultural Research. 43(3): 219-222. doi: .

ABSTRACT

For manufacture of P fertilizer a high grade quality rock phosphate (>30% P2O5) is
required. In India, there is a predominance of low grade rock phosphate reserves and
out of 260 million ton only 15.3 million ton is of high grade quality. Rock phosphate
is usually inert in alkaline and calcareous soils. While exploring the options available
for increasing the solubility of low grade RP, it was thought that the spent wash which
is highly acidic (pH: 3.5-4.5) and generated as a waste in huge quantities (6.8xl010
litres/year) in the country, may be utilized for this purpose. Spent wash has considerable
manurial potential. The extent of P-solubilization from low-grade Udaipur rock
phosphate (RP) by spent wash (SW) was studied by mixing RP and SP in different
ratios i.e. 1:1, 1:2, 1:5, 1:10, 1:20, 1:40, 1:60, 1: 80 and 1:100. The amount of P
solubilized, increased with increasing rate up to RP:SW::1:20 and thereafter, decreased.

KEYWORDS

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