Revista Brasileira de Ciência do Solo | |
Loss of ammonia from nitrogen fertilizers applied to maize and soybean straw | |
Letícia De Abreu Faria1  Carlos Antonio Costa Do Nascimento1  Godofredo Cesar Vitti2  Pedro Henrique De Cerqueira Luz1  Elaine Maria Silva Guedes1  | |
[1] ,USP ESALQ Soil Science Department | |
关键词: boric acid; copper sulfate; coated urea; volatilization; zeolite; ácido bórico; sulfato de cobre; ureia revestida; volatilização; zeólita; | |
DOI : 10.1590/S0100-06832013000400014 | |
来源: SciELO | |
【 摘 要 】
In Brazilian agriculture, urea is the most commonly used nitrogen (N) source, in spite of having the disadvantage of losing considerable amounts of N by ammonia-N volatilization. The objectives of this study were to evaluate: N lossby ammonia volatilization from: [urea coated with copper sulfate and boric acid], [urea coated with zeolite], [urea+ammonium sulfate], [urea coated with copper sulfate and boric acid+ammonium sulfate], [common urea] and [ammonium nitrate]; and the effect of these N source son the maize yield in terms of amount and quality. The treatments were applied to the surface of a soil under no-tillage maize, in two growing seasons. The first season (2009/2010) was after a maize crop (maize straw left on the soil surface) and the second cycle (2012/2011) after a soybean crop. Due to the weather conditions during the experiments, the volatilization of ammonia-N was highest in the first four days after application of the N sources. Of all urea sources, under volatilization-favorable conditions, the loss of ammonia from urea coated with copper sulfate and boric acid was lowest, while under high rainfall, the losses from the different urea sources was similar, i.e., an adequate rainfall was favorablet o reduce volatilization. The ammonia volatilization losses were greatest in the first four days after application. Maize grain yield differed due to N application and in the treatments, but this was only observed with cultivation of maize crop residues in 2009/2010. The combination of ammonium+urea coated with copper sulfate and boric acid optimized grain yield compared to the other urea treatments. The crude protein concentration in maize was not influenced by the technologies of urea coating.
【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
RO202005130054549ZK.pdf | 146KB | download |