Urea absorption by canon leaves as affected by solution pH.

• Autor(a) principal: Rosolem, Ciro Antonio
• Data de Publicação: 2014
• Outros Autores: Barretto, Antonio Enedi, Trivelin, Paulo Cesar Ocheuze, Victoria, Reynaldo Luiz
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/13435
• topic: Gossypium hirsutwn; nitrogen; fertilization; nitrogen top-dressing; nitrogen volatilization; foliar spraying.; Gossypium hirsutum; nitrogênio; adubação; cobertura nitrogenada; volatilização de nitrogênio.

Cotton planta are sensitive to time and rate of N fertilization. Foliar spraying with urea may be an effective way for top-dressing N ia cotton (Gossypium hirsujum L.) crops, although some loss can be observed due to volatilization. Urea ("N) was applied to cotton leaves ia greenhouse condidons, and the N uptake was monitored up to 24 hours after application. Urea solutions pll were adjusted to 3.0, 4.0, 6.0 and 7.0. Alter 24 hours N volatilization was calcu!ated. Urea solutions with p11 3.0 and 4.0 showed a higher N uptake rate than solutions with pU 6.0 and 7.0. After 24 hours more than 90% of the N applied was recovered ia cotton planta. There was not a definitive evidence of N volatilization due to urease activity ia cotton leaves.