Requirement of supplemental irrigation for dry season common bean in Goiás
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Data
2015
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Resumo
Common bean crop is grown in Goiás state in three crop seasons, "wet”, “dry”, and
autumn/winter. In "dry" crop season, common bean yield is lower and it can be attributed in
large part to the water deficit during its cycle. The use of supplemental irrigation can be an
alternative to overcome this stress and increase grain yield. The objective of this study was to
quantify the impact of water stress in "dry" season common bean and the irrigation depth
required to mitigate this stress, using the CSM-CROPGRO-Dry bean simulation model. The
model was calibrated and evaluated against observed data set for Pérola cultivar. Grain yield
for six sowing dates (10/1, 20/01, 30/1, 10/2, 20/2, and 28/2) and three soil classes (Oxisol,
Ultisol, and Inceptisol) were simulated considering growth under rainfall and growth with
supplemental irrigation, using daily climatic data of 26 weather stations in Goiás for the period
of 33 years. The relative impact of water deficit, estimated by the grain yield gap in both cases,
was 48%. Soil classes had low impact on average values of irrigation depth required as well as
on irrigated grain yield. The irrigation depth required increased from 70 to 157 mm and the
grain yield decreased from 3,813 to 3,510 kg ha-1 with the advance of sowing date.
Descrição
Palavras-chave
Phaseolus vulgaris, Water deficiency, Simulation model, Phaseolus vulgaris, Deficiência hídrica, Modelo de simulação
Citação
HEINEMANN, Alexandre Bryan; STONE, Luís Fernando. Requirement of supplemental irrigation for dry season common bean in Goiás. Irriga, Botucatu, v. 1, n. 2, p. 57-66, 2015.