Water consumption, productivity and quality of onion under different irrigation management in organic cultivation

• Autor(a) principal: Carvalho, Adheilton Rogers Pilé de
• Data de Publicação: 2017
• Outros Autores: Leitão, Mário de Miranda Vilas Boas Ramos, Oliveira, Gertrudes Macario de, Santos, Irai Manuela Santana, Araújo, Jairton Fraga
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Verde de Agroecologia e Desenvolvimento Sustentavel
• Texto Completo: https://www.gvaa.com.br/revista/index.php/RVADS/article/view/4430
• topic: Allium cepa L.; Evapotranspiração da cultura; Evapotranspiração de referência; Condições climáticas.; Allium cepa L.; Crop evapotranspiration; Reference evapotranspiration; Climatic conditions.

Productivity and quality of onion bulbs dependent on the amount of water applied to culture. The objective of this work was to determine the water consumption, productivity and quality of onion under different irrigation management in organic farming. The experiment was developed an under randomized block, with three treatments and seven repetitions. The treatments consisted: T1 - irrigation made based on daily data of crop evapotranspiration (ETc); T2 - irrigation based on Kc values proposed in the literature (Kc-lit) for onion and ETo obtained by the TCA method; and T3 - irrigation based on the Kc-lit values and the ETo obtained by the FAO method. The water consumption of the crop (ETc) was obtained through daily measures evapotranspirometers.  The reference evapotranspiration (ETo), obtained by the methods of the class A pan (TCA) and Penman-Monteith (FAO). The following variables were evaluated: bulb diameter, mean bulb mass, total and commercial productivity, soluble solids, titratable acidity and pungency. ETc varied from 3.9 mm d-1 (stage I) to 5.8 mm d-1 (stage III), reaching maximum daily rates of up to 7.2 mm d-1 and total for the crop cycle, 563.4 mm. Different irrigation management, did not produce significant changes in total productivity of onion grown in organic system, with an average value for the different managements, around 15 t ha-1. The environmental conditions verified during the experimental period, with high temperatures, certainly were determinant for bulbs of pungent onion and with low acidity.