Ammonium chloride as an alternative source of nitrogen for sugarcane during two consecutive cycles

• Autor(a) principal: Vieira Megdao, Michele Xavier
• Data de Publicação: 2019
• Outros Autores: Mariano, Eduardo [UNESP], Leite, Jose Marcos, Megdao, Marcio Mahmoud, Ocheuze Trivelin, Paulo Cesar
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S1678-3921.pab2019.v54.00329; http://hdl.handle.net/11449/185801
• topic: Saccharum; electrical conductivity; nitrogen fertilization; root system; stalk productivity

The objective of this work was to evaluate the effect of the application of ammonium chloride as a nitrogen source for sugarcane (Saccharum sp.) on the development of the crop's shoot and roots during two consecutive cycles. The experiment was conducted on a Typic Hapludox in the first and second sugarcane ratoons. The treatments consisted of four N doses (50, 100, 150, and 200 kg ha(-1)) applied as ammonium chloride (NH4Cl), besides a control, without the application of N. The increase in the NH4Cl dose increased in up to three times soil electrical conductivity in the layer of 0.0-0.2 m, with a consequent increase in the concentration of chlorine in leaves. In the second cycle, the contents of chlorine increased in 1,900 mg kg(-1) in the leaf with the application of 200 mg kg(-1) NH4Cl, when compared with the control. In the first cycle, the application of NH4Cl doses above 200 kg ha(-1) N promoted a decrease in shoot productivity. In both cycles, there was no effect of the NH4Cl doses on root dry matter. High doses of NH4Cl, in consecutive sugarcane cycles, result in a decrease in the productivity of stalks for processing.