PRODUCTIVITY OF IRRIGATED PEANUT PLANTS UNDER PULSE AND CONTINUOUS DRIPPING IRRIGATION WITH BRACKISH WATER<sup>1 2</sup>

CRUZ, RUANA IRIS FERNANDES; SILVA, GERÓNIMO FERREIRA DA; SILVA, MANASSÉS MESQUITA DA; SILVA, ALAN HENRIQUE SANTOS; SANTOS JÚNIOR, JOSÉ AMILTON; SILVA, ÊNIO FARIAS DE FRANÇA E

doi:10.1590/1983-21252021v34n121rc

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Agricultural Engineering • Rev. Caatinga 34 (1) • Jan-Mar 2021 • https://doi.org/10.1590/1983-21252021v34n121rc copy

PRODUCTIVITY OF IRRIGATED PEANUT PLANTS UNDER PULSE AND CONTINUOUS DRIPPING IRRIGATION WITH BRACKISH WATER^{1 2}

PRODUÇÃO DE AMENDOIM IRRIGADO COM ÁGUAS SALOBRAS VIA GOTEJAMENTO PULSADO E CONTÍNUO

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Pulse irrigation may be more advantageous for peanut crops than continuous irrigation, when using brackish water. However, studies on pulse irrigation with brackish water considering the environmental conditions of the Northeast region of Brazil using are incipient. Therefore, the objective of this study was to evaluate the effect of using brackish water for pulse and continuous dripping irrigations on the grain yield and production characteristics of peanut (Arachis hypogaea L.) crops. A completely randomized block design with four repetitions was used, in a 6*2 factorial arrangement consisted of six electrical conductivities of the irrigation water (EC; 0.2, 1.6, 2.8, 4.0, 5.2, and 6.4 dS m^-1) set by adding NaCl to the irrigation water, which originally had 0.2 dS m^-1, until reaching the respective EC; and two irrigation methods (pulse and continuous). The evaluated variables were fresh and dry weights of shoot, 10 grains, pods, grains, and production; number of pods and grains; and percentages of empty pods (EP%) and perfect grains (PG%). The addition of salt to the irrigation water negatively affected all variables studied, except for EP% and PG%. The lowest EP% were found for the pulse irrigation, which increased the pod and grain yields, regardless of the EC of the irrigation water. Under the conditions of the present study, the use of brackish waters with electrical conductivities of up to 2.98 dS m^-1 is viable for peanut production.

Keywords:
Arachis hypogaea L; Salinity; Sodium chloride; Pulse irrigation

Universidade Federal Rural do Semi-Árido Avenida Francisco Mota, número 572, Bairro Presidente Costa e Silva, Cep: 5962-5900, Telefone: 55 (84) 3317-8297 - Mossoró - RN - Brazil
E-mail: caatinga@ufersa.edu.br

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Source of variation	Degrees of freedom		Mean Square
			Fresh weight
		Shoot	Pods	Grains	Production	10 grains
Irrigation method (M)	1	34122^ significant at 1% probability;	1257^ significant at 1% probability;	405.83^ significant at 1% probability;	3091.55^ significant at 1% probability;	8.76^ significant at 1% probability;
Electrical conductivity (EC)	5	10712^ significant at 1% probability;	155.23^ significant at 1% probability;	378.62^ significant at 1% probability;	1017.92^ significant at 1% probability;	4.57^ significant at 1% probability;
M × EC	5	68.15^ns ns not significant	1.64^ns ns not significant	1.82^ns ns not significant	3.63^ns ns not significant	0.01^ns ns not significant
Block	3	944.71^ns ns not significant	46.01^ns ns not significant	5.18^ns ns not significant	52.72^ns ns not significant	1.81^ significant at 1% probability;
Residue	33	378.96	19.38	5.75	28.49	0.31
CV	%	8.82	10.91	9.28	8.06	14.50
Source of variation	Degrees of freedom	Dry weight
Source of variation	Degrees of freedom	Shoot	Pods	Grains	Production	10 grains
Irrigation method (M)	1	1153.07^ significant at 1% probability;	96.31^ significant at 1% probability;	176.03^ significant at 1% probability;	532.75^ significant at 1% probability;	2.62^ significant at 1% probability;
Electrical conductivity (EC)	5	1094.47^ significant at 1% probability;	19.17^ significant at 1% probability;	87.25^ significant at 1% probability;	187.52^ significant at 1% probability;	1.86^ significant at 1% probability;
M x EC	5	6.09^ns ns not significant	0.19^ns ns not significant	0.15^ns ns not significant	0.22^ns ns not significant	0.006^ns ns not significant
Block	3	53.68^* * significant at 5% probability;	1.33^ns ns not significant	1.30^ns ns not significant	4.62^ns ns not significant	0.265^ns ns not significant
Residue	33	13.59	0.56	1.33	1.92	0.13
CV	%	6.34	7.41	9.33	6.17	21.34
Source of variation	Degrees of freedom			Production
Source of variation	Degrees of freedom	Number of pods	Number of grains	Percentage of empty pods	Percentage of perfect
Irrigation method (M)	1	5940.75^ significant at 1% probability;	1250.52^ significant at 1% probability;	856.83^ significant at 1% probability;	10.64^ns ns not significant
Electrical conductivity (EC)	5	1325^ significant at 1% probability;	335.47^ significant at 1% probability;	11.151^ns ns not significant	42.04^ns ns not significant
M × EC	5	2.45^ns ns not significant	0.67^ns ns not significant	23.38^ns ns not significant	24.26^ns ns not significant
Block	3	418.28^ significant at 1% probability;	271.68^ significant at 1% probability;	1225.65^ns ns not significant	57.37^ns ns not significant
Residue	33	19.40	3.43	15.34	40.28
CV	%	5.89	4.93	29.20	6.58

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PRODUCTIVITY OF IRRIGATED PEANUT PLANTS UNDER PULSE AND CONTINUOUS DRIPPING IRRIGATION WITH BRACKISH WATER1 2

PRODUÇÃO DE AMENDOIM IRRIGADO COM ÁGUAS SALOBRAS VIA GOTEJAMENTO PULSADO E CONTÍNUO

ABSTRACT

PRODUCTIVITY OF IRRIGATED PEANUT PLANTS UNDER PULSE AND CONTINUOUS DRIPPING IRRIGATION WITH BRACKISH WATER^{1 2}