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2006•Unpublished venueRequires access

INFLUENCE OF LONG TERM APPLICATION OF N, P, K FERTILIZER ON MAJOR SOIL ELEMENTS

Tuyen Quang Tran, Cao Van Phung, Tran Kim Tinh

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Abstract

A long-term fertility experiment to study effects of nitrogen (N), phosphorus (P) and potassium (K) in intensive rice mono-culture has been conducted at Cuu Long Delta Rice Research Institute (CLRRI), Cantho, Vietnam from 1986 to 2003. This showed that total soil nitrogen content increased in NK, P, PK, and NP treatments and was slightly increased in NPK treatment. Total N was not changed in N treatment and decreased in control and K treatments. Total P content increased in treatments with P fertilizer as P alone or PK and NP. Available P was high in the treatments supplied phosphorus. Total K was still high in both plots with and without fertilizer. Total P was not affected by long term N, P, K fertilizer application. Exchangeable K was high in the plots supplied potassium. �

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What this paper is about

A long-term fertility experiment to study effects of nitrogen (N), phosphorus (P) and potassium (K) in intensive rice mono-culture has been conducted at Cuu Long Delta Rice Research Institute (CLRRI), Cantho, Vietnam from 1986 to 2003. This showed that total soil nitrogen content increased in NK, P, PK, and NP treatments and was slightly increased in NPK treatment. Total N was not changed in N treatment and decreased in control and K treatments. Total P content increased in treatments with P fertilizer as P alone or PK and NP. Available P was high in the treatments supplied phosphorus. Total K was still high in both plots with and without fertilizer. Total P was not affected by long term N, P, K fertilizer application. Exchangeable K was high in the plots supplied potassium. �

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Available abstract

A long-term fertility experiment to study effects of nitrogen (N), phosphorus (P) and potassium (K) in intensive rice mono-culture has been conducted at Cuu Long Delta Rice Research Institute (CLRRI), Cantho, Vietnam from 1986 to 2003. This showed that total soil nitrogen content increased in NK, P, PK, and NP treatments and was slightly increased in NPK treatment. Total N was not changed in N treatment and decreased in control and K treatments. Total P content increased in treatments with P fertilizer as P alone or PK and NP. Available P was high in the treatments supplied phosphorus. Total K was still high in both plots with and without fertilizer. Total P was not affected by long term N, P, K fertilizer application. Exchangeable K was high in the plots supplied potassium. �

Key concepts: Fertilizer, Phosphorus, Potassium, Animal science, Nitrogen, Long-term experiment, Soil fertility, Agronomy

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