Fertilizers with coated urea in upland rice production and nitrogen apparent recovery.

Urea is the most used N fertilizer for upland rice, however, a great percentage of N loss can occur with the use of this fertilizer. The use of products that provide reduction of N loss for urea fertilizers can contribute to increase N use efficiency. The objective of this study was to determine the effect of N rates applied in the form of coated urea in the content and accumulation of N in dry biomass, apparent recovery of nitrogen and grain yield of upland rice. The experimental design was a randomized complete blocks arranged in a 4 x 3 + 1 factorial scheme. The treatments consisted of four sources of N fertilizer [1. Common urea; 2. Polymer-coated urea for slow release of N (PCU); 3. urea with the urease inhibitor N-(n-Butyl) thiophosphoric triamide (NBPT); and 4. urea coated with copper sulfate and boric acid as urease inhibitors (UCCB)], with three fertilization rates (30, 60 and 90 kg ha-1 of N). In addition, we included a control treatment without N application. Coated urea did not provide increases in rice grain yield in relation to common urea. The increasing amount of N resulted in significant increases in rice grain yield (from 3217 to 5548 kg ha-1, 2010/11, and from 3392 to 4560 kg ha-1, 2011/12). The apparent nitrogen recovery rate decreased with the increase in N applied doses.

Bibliographic Details

Main Authors:	CARVALHO, M. da C. S., NASCENTE, A. S., TEIXEIRA, P. C.
Other Authors:	MARIA DA CONCEICAO SANTANA CARVALHO, CNPAF; ADRIANO STEPHAN NASCENTE, CNPAF; PAULO CESAR TEIXEIRA, CNPS.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2016-10-11
Subjects:	Arroz, Oryza sativa, Fertilizante, Nitrogênio, Ureia, Rice, Nitrogen fertilizers, Urease inhibitors, Slow-release fertilizers, Polymer-coated urea,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1054379
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