Volatilização de amônia após aplicação de nitrato de amônio em pastagem

Abstract

The problem of degraded pastures in the country is worrying, but with proper management practices it has the potential to increase livestock productivity, through the recovery of areas, as well as the increasing search for technologies, this linked to environmental and economic pressures, generating positive effects with the increase in the carrying capacity of animals and longer duration of pastures without the need for renewal (DIAS FILHO, 2014). Knowledge of the processes involved in the incorporation and transformation of nitrogen (N) in the soil-plant-atmosphere system is essential for the development of management strategies that increase its use by crops (MOREIRA et al., 2017). The objective was to evaluate the nitrogen (N) volatilization after the application of leves of ammonium nitrate in Brachiaria brizantha cv. Marandu using SALE chambers to collect volatilized ammonia. The SALE collector consisted of a transparent plastic bottle (PET) with a capacity of 2 L and an area of 0.008 m2, inside the bottle contained a 70 mL plastic pot containing sulfuric acid plus glycerin and a strip of polyethylene foam soaked in this solution. The experimental design used was randomized blocks with six doses of N: 0, 60, 120, 180, 240 and 300 kg ha-1 of N. The foams were collected every 24 hours in the first 3 days after the application of the doses. , then a collection was performed on the sixth day, one on the eighth and one more on the tenth day. The data were submitted to analysis of variance, and to the F test. There was no volatilization of ammonia in any applied level.