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

Authors

  • Maria da Conceição Santana Carvalho Embrapa Arroz e Feijão
  • Adriano Stephan Nascente Embrapa Arroz e Feijao
  • Paulo César Teixeira Embrapa Solos

DOI:

https://doi.org/10.14393/BJ-v32n5a2016-33068

Keywords:

N fertilizer, Oryza sativa, polymer coated urea, slow release fertilizers, urease inhibitor.

Abstract

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. 

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Published

2016-10-06

How to Cite

CARVALHO, M. da C.S., NASCENTE, A.S. and TEIXEIRA, P.C., 2016. Fertilizers with coated urea in upland rice production and nitrogen apparent recovery . Bioscience Journal [online], vol. 32, no. 5, pp. 1155–1164. [Accessed28 November 2022]. DOI 10.14393/BJ-v32n5a2016-33068. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/33068.

Issue

Section

Agricultural Sciences