Nitrogen Dynamics and Losses in Direct‐Drilled Maize Systems

Autor:	Carina Rosa Álvarez, Raúl S. Lavado, Helena Rimski-Korsakov, Pablo Prystupa
Rok vydání:	2007
Předmět:	Crop residue food and beverages Soil Science Growing season chemistry.chemical_element engineering.material Nitrogen chemistry.chemical_compound chemistry Nitrate Agronomy engineering Environmental science Poaceae Fertilizer Leaching (agriculture) Agronomy and Crop Science Nitrogen cycle
Zdroj:	Communications in Soil Science and Plant Analysis. 38:2045-2059
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103620701548712
Popis:	The knowledge of nitrogen (N) losses in direct‐drilling agrosystems is essential to develop strategies to increase fertilizer efficiency and to minimize environmental damage. The objectives were i) to quantify the magnitude of N volatilization and leaching simultaneously as affected by different urea fertilization rates and ii) to evaluate the capacity of these specific plant–soil systems to act as a buffer to prevent nitrate leaching. Two experiments were conducted during 2001/02 and 2002/03 growing seasons in Alberti, Argentina. The crop was direct‐drilled maize and the soil a Typic Argiudoll. Ammonia losses, N uptake by crop at flowering and harvest, grain yield, N in previous crop residues, and soil nitrate content up to 2‐m depths were determined. Nitrogen availability, soil nitrate (NO3)‐N up to 1 m plus fertilizer N, was linearly and highly associated with crop N uptake at flowering (R2=0.93, P
Databáze:	OpenAIRE
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