Predicting Nitrogen Availability to Rice: I. Comparison of Methods for Determining Available Nitrogen to Rice from Field and Reservoir Soils

Sims, J. L.; Wells, J. P.; Tackett, Dewey L.

doi:10.2136/sssaj1967.03615995003100050018x

Cited by 23 publications

(6 citation statements)

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“…The results showed that ammonium N released in soil samples was poorly correlated with soil organic C or total N. The authors hypothesized that inputs of N from sources other than N mineralization of soil organic matter in surface soil and the differences in soil organic matter quality related to intensive cropping in submerged soil influenced the relationships between mineralized N and soil organic matter . These results are in agreement with the findings from field studies, which showed that organic C or total N was a poor predictor of N supply to the rice crop (Sims, Wells, and Tackett 1967;Dolmat, Patrick, and Peterson 1980;Adhikari et al 1999).…”

Section: Relationships Between Organic Matter and Mineralizable Nitrogensupporting

confidence: 92%

Organic Matter and Mineralizable Nitrogen Relationships in Wetland Rice Soils

Sahrawat¹

2006

Communications in Soil Science and Plant Analysis

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Soil nitrogen (N) supply plays a dominant role in the N nutrition of wetland rice. Organic matter has been proposed as an index of soil N availability to wetland rice. This is based on the finding that mineralizable N produced under waterlogged conditions is related to soil organic carbon (C) and total N. The relationship between organic matter and mineralizable N is a prerequisite for determining the N requirement of wetland rice. However, no critical analysis of recent literature on organic mattermineralizable N relationships has been made. This article evaluates current literature on the relationships of mineralizable N or ammonium N production with soil organic C in wetland rice soils. A number of studies with diverse wetland rice soils demonstrate a close relationship of N mineralized (ammonium-N) under anaerobic conditions with organic C or total N. However, a few recent studies made on sites under long-term intensive wetland rice cropping showed that strong positive relationships of mineralizable N with organic C or total N do not hold. Clearly, both quantity and quality of organic matter affect N mineralization in wetland rice soils. Future research is needed to clarify the role of quality of organic matter, especially its chemistry, as modified by the chemical environment of submerged soils, on the mineralization of organic N in wetland rice soils.

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Section: Relationships Between Organic Matter and Mineralizable Nitrogensupporting

confidence: 92%

Organic Matter and Mineralizable Nitrogen Relationships in Wetland Rice Soils

Sahrawat¹

2006

Communications in Soil Science and Plant Analysis

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“…The results by Cassman et al (1996) support the findings from field studies, which showed that soil organic C or total N was a poor predictor of N supply to the rice crop (Sims et al 1967;Dolmat et al 1980;Adhikari et al 1999).…”

Section: Organic Matter Quantity and Soil Organic Nitrogen Mineralizasupporting

confidence: 79%

“…Indeed, significant correlations of organic C with mineralizable N, yield, or N uptake of tropical wetland rice have been reported (Sahrawat 1983a). However, some reports, especially from intensified lowland rice systems, indicated poor or nonsignificant correlations of organic C and total N with mineralizable N, yield, or N uptake by wetland rice (Sims et al 1967;Dolmat et al 1980;Cassman et al 1996;Adhikari et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen mineralization in lowland rice soils: The role of organic matter quantity and quality

Sahrawat

2010

Archives of Agronomy and Soil Science

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and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, redistribution , reselling , loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

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“…The method has received special attention in estimating N availability for paddy rice production (Koyama, 1971;Dolmat et al, 1980). Also, it has been shown that the results by this method are significantly correlated with dry matter yield and N yield of corn (Zea mays L.), orchardgrass (Dactylis qlomerata L.), ryegrass, and forest trees (Sims et al, 1967;Smith, 1966;Tejeda and Gogan, 1970;Cornforth and Walmsley, 1971;Baerug et al, 1973;Powers, 1980). In the same study, a k value of 0.054 ± 0.09 was obtained from a pooled regression of 29 soils.…”

Section: Literature Reviewmentioning

confidence: 99%

“…However, the use of these indexes is justified by the fact that available N is derived from the pool of soil organic matter through the min eralization process. In general, organic C or total N have been considered poor indexes of N availability for rice (Bremner, 1965a;Sims et al, 1967;Chang, 1978). However, under waterlogged conditions, Sahrawat (1983) found a high correlation of these indexes with the potentially mineralizable N of soils.…”

Section: Chemical Indexes Of Available Nitrogenmentioning

confidence: 99%

Indexes of plant available organic nitrogen in soils

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Predicting Nitrogen Availability to Rice: I. Comparison of Methods for Determining Available Nitrogen to Rice from Field and Reservoir Soils

Cited by 23 publications

References 0 publications

Organic Matter and Mineralizable Nitrogen Relationships in Wetland Rice Soils

Organic Matter and Mineralizable Nitrogen Relationships in Wetland Rice Soils

Nitrogen mineralization in lowland rice soils: The role of organic matter quantity and quality

Indexes of plant available organic nitrogen in soils

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