Ammonia losses by volatilization in response to nitrogen fertilization of bean common crop

Nitrogen (N) is one of the nutrients that most limits the growth and development of plants, mainly because of its wide dynamics in the soil-plant-atmosphere system. Among the various processes that this element is subject, can highlight volatilization. The ammonia (N-NH3) losses by volatilization can reach 78% of the N applied as urea, and it varies according to the source used. This study aimed to quantify the N-NH3 losses by volatilization, resulting from the application of different doses and sources of N in bean common crop (Phaseolus vulgaris L.). The experimental design was randomized blocks, with sixteen treatments and five repetitions. The treatments consisted of three rates of N in cover (100, 200 and 300 mg dm(-3)) and five N sources, and a control treatment (no nitrogen fertilization). The highest numerical losses of N-NH3 volatilization occurred in the second period of application for the Ajifer, urea and ammonium nitrate sources.