Study of monoammoniumphosphate and diammoniumphosphate fertilizers as sources of phosphorus for rice in acid sulphate soils by using nuclear technique
1984
Chittiwan Mahitsarakun | Chittima Amonphimon (Department of Agriculture, Bangkok (Thailand). Agricultural Chemistry Div.) | Amphai Sattrusayaeng
At present, more attention has been placed to monoammonium and diammonium phosphate as P-sources to rice cultivation. This experiment aims to study the utilization of rice variety RD 23 in two acid sulphate soils, namely, Rangsit and rangsit very acid. The results obtained from pot experiment showed that there were no significant differences on phosphorus uptake obtained from mono or diammoniumphosphate or a standard P-source (triplesuperphosphate). 32P was used as a tracer to differentiate the soil and fertilizer phosphorus. The results indicated that plant phosphorus that was derived from the three P-sources in Rangsit very acid soil was more than the soil phosphorus. In other words, the results suggested that variety RD 23 did utilize more soil phosphorus than fertilizer phosphorus in Rangsit soil as compared to rangsit very acid soil. The results also showed that growth response to fertilizer applications of rice plant grown in Rangsit soil was better than that in Rangsit very acid soil when height, number of tillers and dry weight were observed
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