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Alkaline hydrolyzable nitrogen and properties that dictate its distribution in paddy soil profiles

Pedosphere 2020年第3期30卷 326-335页

作者： Gerson Laerson DRESCHER Leandro Souza DA SILVA Qamar SARFARAZ Gustavo DAL MOLIN Laura Brondani MARZARI Augusto Ferreira LOPES cesar cella Daniela Basso FACCO Rodrigo Knevitz HAMMERSCHMITT Department of Soil Science Federal University of Santa MariaSanta Maria 97105-900Brazil Federal University of Santa Maria Campus Cachoeira do SulCachoeira do Sul 96506-310Brazil

Nitrogen(N) is a key nutrient for rice production, and its bioavailability in paddy soils is strongly coupled to soil organic matter(SOM) cycling. A better understanding of potentially available N forms in soil, such as alkaline hydrolyzable N(AH-N), and their depth distribution will support the development of best management practices to improve the N use efficiency of rice while minimizing adverse environmental effects. Fifteen rice(Oryza sativa L.) fields from Southern Brazil were selected, and stratified soil samples were taken to a depth of 60 cm before crop establishment. Selected soil physical and chemical properties were analyzed to evaluate their relationships with AH-N contents in the soil profile. The AH-N contents below 20 cm varied extensively(increased,reduced, or constant) compared with that above 20 cm. Although clay and clay + silt contents were highly correlated to AH-N for some soils, the major property dictating AH-N distribution by depth was total N(TN), as the correlation between TN and AH-N was mainly by direct effect. The proportion of TN recovered as AH-N across sites and depths presented high amplitude, and thus AH-N was not a constant N pool across depths, indicating that AH-N can be affected by soil management practices even when TN showed no major changes. The distinct distribution of AH-N across soil sampling sites and depths indicates that depths greater than 20 cm should be considered when calibrating the AH-N index for N fertilizer recommendations for flooded rice in Southern Brazil.

关键词： fertilizer recommendation nitrogen availability nutrient management practices organo-mineral interaction Oryza sativa L. soil analysis soil organic matter

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