Duromide increase NBPT efficiency in reducing ammonia volatilization loss from urea

Bruno Maia Abdo Rahmen Cassim,Wagner Deckij Kachinski,Gabriel Ferrari Paschoeto,Carolina Fedrigo Coneglian,Celso Rafael Macon,Marcos Renan Besen,Marcelo Augusto Batista,Tadeu Takeyoshi Inoue

doi:10.36783/18069657rbcs20210017

Abstract

ABSTRACT Novel fertilizer stabilization technologies are needed to decrease ammonia (NH3-N) losses and increase nitrogen use efficiency. Duromide + NBPT is a new technology that combines two molecules, Duromide and NBPT, whose propose is to increase the efficiency of the urease inhibitor NBPT in reducing NH3-N loss from urea. Preliminary results showed that Duromide + NBPT can be a more effective product than just NBPT, particularly under low soil pH and high-temperature conditions. This study aimed to compare the effects [...]

Highlights

Nitrogen (N) is the nutrient required in the greatest amounts and the most limiting factor for plant growth (Souza and Fernandes, 2018)
The maximum cumulative losses (α) of NH3-N, according to the adjusted model, were 11.2, 7.6, 5.1, 4.2, 3.6, and 2.7 kg ha-1 in plots treated with Ur90, Ur90-NBPT, Ur90-Duromide + NBPT, Ur45, Ur45-NBPT, and Ur45-Duromide + NBPT, respectively (Table 2)
Urea treated with the stabilizers NBPT and Duromide + NBPT reduced NH3-N losses by 14.8 and 35.3 %, respectively, compared with conventional urea at a dose of 45 kg ha-1 of N and by 31.9 and 54.2 %, respectively, compared with conventional urea at 90 kg ha-1 of N

Summary

Introduction

Nitrogen (N) is the nutrient required in the greatest amounts and the most limiting factor for plant growth (Souza and Fernandes, 2018). Urea [CO(NH2)2] is the most used N fertilizer worldwide, with a total production of 183.2 Mt yr-1, supplying 53.3 % of the current N demand (IFA, 2019). When broadcast onto the soil surface, urea is highly susceptible to losses by leaching, denitrification, and ammonia (NH3-N) volatilization (Gillette et al, 2017). Urea is hydrolyzed by the action of ureases, resulting in the production of ammonium (NH4+) and carbon dioxide (CO2), as demonstrated by the reaction CO(NH2)2 + 2H+ + 2H2O → 2NH4+ + H2O + CO2 (Cantarella, 2007). Because urea hydrolysis consumes protons (H+), the reaction results in increased pH around fertilizer granules, shifting the equilibrium toward the formation of NH3-N, which is subsequently lost to the atmosphere in its gaseous form (NH3) (Rochette et al, 2009; Cantarella et al, 2018)

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