Soil-water tension: effect on yield and grain quality of barley

• Autor(a) principal: Guerra, Antônio Fernando
• Data de Publicação: 1995
• 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/4299
• topic: tensiometers; gypsum blocks; irrigation; water stress; tensiômetros; blocos de gesso; irrigação; estresse hídrico

The objective of this work was to study the effect of three levels of soil-water tension (187, 824 and 1.000 kPa) in three stages of development of barley (Hordeum vulgare, L.) (stage I = emergency to initial tillering, stage II = initial tillering to complete flowering and stage III = complete flowering to hard dough grain) on the crop development, yield, and grain quality. During stage I, all treatments were irrigated at 187 kPa. Due to plant lodging in earlier studies, a well-irrigated treatment (187 kPa) in which cycocel was applied. The crop was irrigated when the soil-water tension at 10 cm depth reached the values of each treatment. The amount of water applied in each irrigation was calcu-lated to bring the soil profile 1 m depth to the field capacity (6 kPa). Irrigation at 187 kPa in all the crop cycle resulted in higher yield independently of cycocel application. Irrigation at 824 kPa in at least one developmental stage resulted in a significative reduction in yield. Nevertheless, the grain protein con-tent was adequate for malting. Irrigation at 1.000 kPa caused a drastic reduction in yield and grain quality. Irrigation at 824 kPa in stage II caused a reduction of plant height similar to cycocel application.