Use of phosphate rock for arable food crop production in Thailand
1992
Sangtong, P. | Wajanawat, V. | Cholitkul, W. (Department of Agriculture, Bangkok, Thailand (Thailand))
Phosphorus is one of the most important nutrients for crop production in Thailand. Of the phosphate fertilisers, the cheaper phosphate rocks found in deposits in Thailand are considered to be important sources of P for crop production. There are three types of phosphate rocks in Thailand. they are the guano-derived, marine phosphate and aluminium phosphate rocks which contain 14 to 35 percent total P2O5. Phosphate rocks have been used as P fertilisers for rice, field crops and rice-soybean crop rotation systems. Application of phosphate rock increased the yield of rice grown in acid sulphate soil. Compared with concentrated superphosphate, phosphate rock showed higher residual effect on corn grown in reddish brown lateritic soils. For soybean and mungbean grown on low pH soils, the superiority of phosphate rock was also observed. For rice-soybean crop rotation systems, phosphate rock increased the uptake of phosphorus. Soybean grown after rice markedly responded to phosphate rock applied during rice planting
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