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RESEARCH ARTICLE
Contents Vol 42(6)

Applying mixed manure and inorganic phosphorus fertiliser to improve rice yield on acid sulfate soil (Hydraquentic Sulfaquept)

Do Thi Thanh Ren A , Tran Kim Tinh A B , Nguyen Thi Ngoc Minh A and Tran Ba Linh A
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- Author Affiliations

A Department of Soil Science & Land Management, Agronomy Faculty, Can Tho University, Viet Nam.

B Corresponding author; email: tktinh@ctu.edu.vn

Australian Journal of Soil Research 42(6) 693-698 https://doi.org/10.1071/SR03082
Submitted: 16 May 2003  Accepted: 22 March 2004   Published: 17 September 2004

Abstract

In order to improve the yield of rice cultivated on acid sulfate soil, 2 field experiments and 1 pot experiment were conducted continuously for 5 and 2 crops, respectively (1997–2000), in Tri Ton district, An Giang province, Vietnam. Soil for the pot experiment was taken from the 2 field experiments to study the residual effect on phosphorus availability.

Both organic and inorganic phosphorus had a possitive effect on the rice yield. Compared with the treatments being fertilised at the same doses of P, a significantly higher yield was obtained in the treatment of mixed inorganic P fertiliser and manure. This effect was found only in the first crop. From the second crop onward, rice yields were not different among treatments (mixed fertilisers, inorganic P fertiliser, and manure only). Manure-only treatment resulted in rice yield equal to the treatment with 60 kg P2O5 in the form of superphosphate. Supplying phosphorus in both organic and inorganic forms over several crops resulted in an accumulation of phosphorus in soil, which became available for rice growth in the following crop season. Adding P fertiliser modified the P fraction in acid sulfate soil mainly to the form of Fe-P.

Additional keywords: inorganic phosphorus, organic phosphorus, phosphorus species, phosphorus residue.


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