Water availability to soybean crop as a function of the least limiting water range and evapotranspiration
Carregando...
Data
2017-06
Título da Revista
ISSN da Revista
Título de Volume
Editor
Evandro Novaes
Resumo
Irrigation management aimed at optimal production has
been based only on the water factor. However, in addition to
the water potential of the soil, factors such as soil penetration
resistance and soil O2 diffusion rate also affect plant growth
and interfere with water absorption, even if moisture is within
the available water range. This study aimed at quantifying the
least limiting water range and demonstrating its potential in
soil and water management in irrigated agriculture. In order to
determine the least limiting water range, soil water retention
curves and soil resistance to penetration were determined
from undisturbed soil samples. The sequential water balance
and the reference, crop and real evapotranspiration were
determined for a soybean crop season. Soil aeration was
the least limiting water range upper limit for soils with bulk
density greater than 1.33 Mg m-3, whereas soil resistance
to penetration was the lower limit for bulk density higher
than 1.43 Mg m-3. The bulk density of the soil studied was
1.35 Mg m-3, indicating 0.37 m3 m-3 of water availability, based
on the least limiting water range, which is sufficient to supply
the crop evapotranspiration. Irrigation management based on
the least limiting water range is more efficient and complete
than that based only on available water.
Descrição
Palavras-chave
Glycine max L. [Merril], Balanço de água no solo, Demanda hídrica, Soil water balance, Water demand
Citação
RODRIGUES, Tallyta Ramalho; CASAROLI, Derblai; EVANGELISTA, Adão Wagner Pêgo; ALVES JÚNIOR, José. Water availability to soybean crop as a function of the least limiting water range and evapotranspiration. Pesquisa Agropecuária Tropical, Goiânia, v. 47, n. 2, p. 161-167, abr./jun. 2017. Disponível em: <https://www.revistas.ufg.br/pat/article/view/43746/23292>.