Effects of soil moisture regime and phosphorus source on phosphorus nutrition, growth and grain yield of rice in acid soils [Thailand]
1988
Oraphan Rirermsoonthorn
In acid sulfate acid soil (pH 4.2;Typic Sulfaquept), soil saturation or submergence did not affect rice grain yield, except with North Carolina rock phosphate (NC) applied at 80 and 130 ppm P. However, lowest P application level (80 ppm P), as NC and Jordan rock phosphate (JRP) in saturated soil and as NC in submerged soil, gave grain yields similar to that of the no fertilizer P control. Under saturated condition, JRP at the highest P application level (160 ppm P) gave the highest grain yield. Under submerged condition, triple superphosphate (TSP) at 160 ppm P gave the highest yield. In Claveria soil (pH 4.5; Ultic Haplorthox) markedly higher grain yield were obtained in saturated than in submerged soil when NC fertilizer was applied. Phosphorus application increased grain yield, regardless of P source and soil moisture regime. Under submerged condition, NC was less effective than TSP and JRP at low application levels(900 and 1,100 ppm P). In Caliraya soil (pH 4.6;Orthoxec Palehumult), under submerged condition, no grains were obtained from any plants. All control plants under both soil moisture regimes had poor growth from early crop stage until maturity, hence, no grain yield was obtained. Under saturated condition, TSP and NC gave similar grain yields. Jordan rock phosphate at low application level (430 ppm P) gave grain yields similar to that of the no fertilizer P control. At the highest P level, JRP gave grain yields similar to those of NC and TSP. The limiting factors to growth and grain yield of IR 64 were the high proportions of Fe and Al contents and the low proportions of P, Mn, and Zn contents.
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