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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
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
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