Soil water availability for drip-irrigated common bean crop

Santos, Edson Fagne dos; Santos, Silvanio Rodrigues dos; Carvalho, Abner José de; Aspiazu, Ignácio; Oliveira, Polyanna Mara de

doi:10.1590/1983-40632020v5057367

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Research Article • Pesqui. Agropecu. Trop. 50 • 2020 • https://doi.org/10.1590/1983-40632020v5057367 copy

Soil water availability for drip-irrigated common bean crop

Disponibilidade de água no solo para feijoeiro-comum irrigado por gotejamento

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Minimum limits of soil water storage should be established for the irrigation management of crops, in order to satisfactorily provide water to plants. This study aimed to define the soil water availability factor (f factor) that provides the maximum agronomic yield and maximum water-use efficiency for drip-irrigated common bean cultivars. The experiment was carried out in a randomized block design, with four replications. The treatments were arranged in split plots, with the plots consisting of f factors (0.20, 0.35, 0.50, 0.65 and 0.80) and subplots consisting of common bean cultivars (BRS Pérola and BRS Estilo). The use of f factors between 0.30 and 0.35 is recommended for common bean crops to obtain the maximum agronomic yield and maximum water-use efficiency. The BRS Estilo cultivar presents a water-use efficiency 16 % higher than the BRS Pérola.

KEYWORDS:
Phaseolus vulgaris L.; water availability factor; irrigation management

Soil depth (m)	Equation¹ 1 θ : volume-based moisture; τ : soil water tension (kPa).	R²	FC	PWP	ρ_s
0.0-0.2	$θ = 0.0299 + [(0.410 - 0.0299)] / {[1 + {(0.10 \times τ)}^{1.7475}]}^{0.4278}$	0.99	0.2324	0.0389	1.39
0.2-0.4	$θ = 0.0221 + [(0.425 - 0.0221)] / {[1 + {(0.10 \times τ)}^{1.7543}]}^{0.4300}$	0.98	0.2357	0.0313	1.39

f factor	WDBT	TWD	NI
0.20	137.7	275.9	40
0.35	137.7	309.9	37
0.50	137.7	294.0	33
0.65	137.7	249.3	30
0.80	137.7	221.7	28

Source of variation¹ 1 CV: coefficient of variation for the plot (a) and subplot (b); * and ** significant values by the F-test at 5 % or 1 % of probability, respectively;	Degrees of freedom	Mean square
	Degrees of freedom	NPP	NGP	100GW	GY	WUE
f factor	4	16.96**	4.52**	8.28^ns ns not significant values by the F-test at 5 % of probability.	1,314,016.51**	0.120**
Block	3	4.91**	0.20^ns ns not significant values by the F-test at 5 % of probability.	4.58^ns ns not significant values by the F-test at 5 % of probability.	213,139.58**	0.029**
Error (a)	12	1.22	0.29	621.86	60,177.32	0.008
Cultivar	1	6.48*	3.86**	78.76**	157,363.23*	0.022*
f factor × cultivar	4	1.23^ns ns not significant values by the F-test at 5 % of probability.	0.08^ns ns not significant values by the F-test at 5 % of probability.	4.05^ns ns not significant values by the F-test at 5 % of probability.	70,975.61^ns ns not significant values by the F-test at 5 % of probability.	0.009^ns ns not significant values by the F-test at 5 % of probability.
Error (b)	15	0.76	0.14	340.49	31,170.10	0.004
CV_(a) (%)		24.64	14.91	10.77	29.91	30.440
CV_(b) (%)		19.41	10.26	7.97	21.52	21.670
Overall mean		4.49	3.65	23.15	820.28	0.292

Cultivar	NPP	NGP	100GW	GY	WUE
BRS Pérola	4.08 b¹ 1 Means followed by different letters in the columns are different by the F-test at 5 % of probability.	3.34 b	24.55 a	757.56 b	0.27 b
BRS Estilo	4.89 a	3.96 a	21.74 b	883.01 a	0.32 a

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[TFN1] ¹
θ : volume-based moisture; τ : soil water tension (kPa).