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Title: | Soil and Rice Responses to Phosphate Fertilizer in Two Contrasting Seasons on Acid Sulfate Soil |
Authors: | Nguyễn, Ngọc Đệ Trần, Văn Dũng Nguyễn, Văn Quí Trần, Ngọc Quý Nguyễn, Thành Trực Macdonald, Bennet To, Phuc Tuong |
Keywords: | Acid sulfate soil Gleyi–Orthithionic Fluvisol Inceptisols Phosphate fertilizer Rice growth |
Issue Date: | 2017 |
Series/Report no.: | Communications in Soil Science and Plant Analysis;48 .- p.615-623 |
Abstract: | Acid sulfate soils (ASS) are characterized by low pH, aluminum (Al), and iron (Fe) toxicity and are typically deficient in phosphate (PO₄). The application of phosphorus (P) fertilizer could help reduce the level of exchangeable Al and Fe, thereby improving the rice growth and yield. Five levels of P (0, 20, 40, 60 and 80 kg phosphorus pentoxide (P₂O₅)/ha) were tested with rice varieties MTL560 in the wet season and MTL480 in the dry season. The optimum rate of P was 60 kg P₂O₅/ha for rice in the dry season and 80 kg P₂O₅5/ha in the wet season. Soil testing showed at the start of the season that there was sufficient P in the soil. At the end of the season there was a reduction in soil Al and Fe in plots that had P rates above 40 kg P₂O₅/ha. It is therefore likely that P application reduced Al and Fe toxicity through precipitation and formation of Al-P and Fe-P compounds, which boasted yield, rather amending a soil P deficiency. |
URI: | http://localhost:8080//jspui/handle/123456789/5285 |
Appears in Collections: | Tạp chí quốc tế |
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