CROP WATER STRESS INDEX OF COWPEA UNDER DIFFERENT WATER AVAILABILITY LEVELS IN CASTANHAL-PA

Authors

  • Erika de Oliveira Teixeira de Carvalho Socio-environmental and Water Resources Institute, Universidade Federal Rural da Amazônia, Belém, PA https://orcid.org/0000-0002-8413-7615
  • Miss Socio-environmental and Water Resources Institute, Universidade Federal Rural da Amazônia, Belém, PA https://orcid.org/0000-0002-3513-0759
  • Igor Cristian de Oliveira Vieira Socio-environmental and Water Resources Institute, Universidade Federal Rural da Amazônia, Belém, PA https://orcid.org/0000-0002-0488-5008
  • Bruno Gama Ferreira Socio-environmental and Water Resources Institute, Universidade Federal Rural da Amazônia, Belém, PA https://orcid.org/0000-0001-5782-819X
  • Hildo Giuseppe Garcia Caldas Nunes Socio-environmental and Water Resources Institute, Universidade Federal Rural da Amazônia, Belém, PA https://orcid.org/0000-0003-4072-003X
  • Paulo Jorge de Oliveira Ponte de Souza Socio-environmental and Water Resources Institute, Universidade Federal Rural da Amazônia, Belém, PA https://orcid.org/0000-0003-4748-1502

DOI:

https://doi.org/10.1590/1983-21252022v35n322rc

Keywords:

Water deficit. Canopy temperature. Vigna unguiculate.

Abstract

Cowpea is a crop of great socioeconomic relevance for the populations of the North and Northeast of the country, and its low yield is commonly related to environmental stresses, especially water. The objective of this study was to evaluate the water stress index of cowpea, cultivar BR3 - Tracuateua, subjected to different irrigation levels (100, 50, 25 and 0% of ETc) in three reproductive phenological stages (R7, R8 and R9) in Castanhal-PA, Brazil. The experimental design was in randomized blocks, with six replications and four treatments corresponding to 100, 50, 25 and 0% of daily replacement of crop evapotranspiration, during the reproductive period, through an irrigation system. The surface temperature readings were made with infrared thermometer, during the reproductive stage. The smallest absolute temperature differences between canopy and air occurred in stages R7 and R8. The highest values of water stress index (CWSI) were verified when the plant was under water deficit, regardless of phenological stages. The effect of water deficit caused reductions in stomatal conductance of 58.82% (R7), 83.57% (R8) and 84.87% (R9), in leaf transpiration of 45.97% (R7), 64.21% (R8) and 65.90% (R9) and in the net photosynthetic rate of 40.75% (R7), 66.92% (R8) and 74% (R9). The CWSI varied with the availability of water, showing the highest value (0.75) in the treatment without irrigation, in the R8 stage. The CWSI proved to be a good indicator of the water status of the plant.

 

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Published

12-07-2022

Issue

Vol. 35 No. 3 (2022)

Section

Agricultural Engineering

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