Biophysical controls of evapotranspiration in cowpea cultivation under different water regimes

Souza, Daniely F. S. de; Pinto, João V. de N.; Costa, Deborah L. P.; Vieira, Igor C. de O.; Silva, Thieres G. F. da; Souza, Paulo J. de O. P. de

doi:10.1590/1807-1929/agriambi.v23n10p725-732

home Sumário navigate_before Anterior Atual Seguinte navigate_next

home Sumário

Articles • Rev. bras. eng. agríc. ambient. 23 (10) • Oct 2019 • https://doi.org/10.1590/1807-1929/agriambi.v23n10p725-732 linkcopy

Biophysical controls of evapotranspiration in cowpea cultivation under different water regimes

Controles biofísicos da evapotranspiração em cultivo de feijão-caupi sob diferentes regimes hídricos

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this study was to analyze the variations of the decoupling factor and the aerodynamic and stomatal conductances for cowpea subjected to different levels of water availability during the reproductive phenological stages of the crop. The study was conducted in the municipality of Castanhal located in the northeast of the state of Pará, Brazil, in an area planted with cowpea, in 2013, 2014 and 2015 with four irrigation treatments: T100 - replacement of 100% of the crop evapotranspiration (ETc); T50 - replacement of 50% ETc; T25 - replacement of 25% ETc; and T0 - without any replacement (without irrigation). The interaction between the crop and the atmosphere in water vapor exchange was estimated through the decoupling factor (Ω), which was between 0.5 and 1, except for the treatment without irrigation, indicating a moderate to high decoupling between the crop and the atmosphere, so that the water vapor exchange process was controlled by the energy supply, instead of stomatal control.

Key words:
Vigna unguiculata (L.) Walp; decoupling factor; aerodynamic conductance; stomatal conductance

Phenological stage	Days after sowing (DAS)
Phenological stage	2013	2014	2015
R5	-	37	34
R7	41	43	39
R8	47	50	46
R9	58	57	58

		Ω (dimensionless)			g_s (mmol m^-2 s^-1)			θs (m³ m^-3)
		2013	2014	2015	2013	2014	2015	2013	2014	2015
R5	T100		0.89 aA	0.80 aA		641.4 aA	366.4 aA		0.18 bB	0.20 aA
	T50		0.90 aA	0.83 aA		639.2 aA	416.4 aA		0.16 dB	0.19 bA
	T25		0.91 aA	0.81 aA		721.6 aA	369.9 aA		0.18 aA	0.15 cB
	T0		0.89 aA	0.80 aA		560.6 aA	352.8 aA		0.17 cA	0.14 dB
R7	T100	0.80 aB	0.89 aA	0.75 cA	739.0 aA	648.4 aA	627.5 aA	0.19 aB	0.19 aB	0.21 aA
	T50	0.89 aB	0.89 aA	0.72 abC	714.4 aA	662.8 aA	316.6 bB	0.18 bA	0.14 dC	0.17 bB
	T25	0.82 aB	0.90 aA	0.66 bC	680.0 aA	635.6 aA	266.4 bcB	0.17 cB	0.17 bA	0.12 cC
	T0	0.50 bB	0.89 aA	0.57 cB	161.0 bB	620.8 aA	175.9 cB	0.16 dA	0.15 cB	0.11 dC
R8	T100	0.86 aA	0.81 aA	0.70 aB	743.5 aA	727.2 aA	352.3 aB	0.15 aC	0.17 aB	0.23 aA
	T50	0.82 abC	0.79 aA	0.70 aB	536.7 bA	624.7 aA	343.9 aB	0.14 aB	0.13 cC	0.17 bA
	T25	0.78 bA	0.81 aA	0.64 aB	445.0 bB	755.8 aA	270.4 aC	0.06 bC	0.15 bA	0.10 cB
	T0	0.59 cB	0.78 aA	0.54 bB	193.1 cB	570.7 aA	175.0 aB	0.06 bC	0.15 bA	0.10 cB
R9	T100	0.86 aA	0.71 aA	0.83 aA	696.2 aA	520.1 aB	386.2 aC	0.23 aA	0.16 aC	0.21 aB
	T50	0.85 aA	0.61 aA	0.80 aA	640.4 aA	346.9 bB	309.4 abB	0.21 bA	0.09 dC	0.12 bB
	T25	0.77 aA	0.68 aA	0.77 aA	334.9 bB	445.7 abA	260.3 bB	0.20 cA	0.11 cB	0.08 dC
	T0	0.65 aA	0.50 aA	0.65 aA	201.9 cA	235.3 cA	141.9 cA	0.19 dA	0.12 bB	0.09 cC

vertical_align_top show_chart

more_horiz close
- image
- translate
- link
- article
- vertical_align_top
- file_download
- show_chart
- image
- translate
- link
- article

location_on

Unidade Acadêmica de Engenharia Agrícola Unidade Acadêmica de Engenharia Agrícola, UFCG, Av. Aprígio Veloso 882, Bodocongó, Bloco CM, 1º andar, CEP 58429-140, Tel. +55 83 2101 1056 - Campina Grande - PB - Brazil
E-mail: revistagriambi@gmail.com

rss_feed Acompanhe os números deste periódico no seu leitor de RSS

[TFN1] R5 - First floral bud; R7 - First exposed pod; R8 - Grain filling; R9 - Physiological maturity