Gas exchanges and mineral content of corn crops irrigated with saline water

Rodrigues, Valdécio dos Santos; Sousa, Geocleber Gomes de; Soares, Stallone da Costa; Leite, Kelly Nascimento; Ceita, Emanuel D´Araújo Ribeiro de; Sousa, José Thomas Machado de

doi:10.1590/0034-737X202168050010

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Soil and plant nutrition • Rev. Ceres 68 (5) • Sep-Oct 2021 • https://doi.org/10.1590/0034-737X202168050010 copy

Gas exchanges and mineral content of corn crops irrigated with saline water¹ 1 This work is part of the first author's master's dissertation, and it was funded by Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP).

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Inferior quality water can be used by agricultural producers in arid and semi-arid regions due to the lower availability of good-quality water. Therefore, the objective was to identify the influence of irrigation with saline water on gas exchange and leaf contents in corn (Zea mays L.) crop. The work was conducted in the field, in the experimental area of the Experimental Farm of the University of International Integration of Afro-Brazilian Lusofonia (UNILAB), Redenção-CE. The experimental design used in the research was randomized blocks, with five treatments: 1.0; 2.0; 3.0; 4.0 and 5.0 dS m^-1 and four repetitions. At 45 days after sowing (DAS) the gas exchange variables were evaluated: transpiration, stomatal conductance, photosynthesis, internal CO₂ concentration, water use efficiency and leaf temperature. And at 110 DAS the contents of N, P, K, Ca and Mg in plant leaves. The saline stress due to saltwater irrigation leads to a reduction in photosynthesis, stomatal conductance, internal CO₂ concentration and transpiration in field maize plants. Salt stress reduces the levels of N, P, K, Ca and Mg mineral elements in maize leaves.

Keywords:
saline stress; gas exchange; mineral content; Zea mays L

Universidade Federal de Viçosa Av. Peter Henry Rolfs, s/n, 36570-000 Viçosa, Minas Gerais Brasil, Tel./Fax: (55 31) 3612-2078 - Viçosa - MG - Brazil
E-mail: ceres@ufv.br

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[1] ^*Corresponding author: valdeciorodrigues@hotmail.com

Chemical attributes
OM	N	P	K⁺	Ca²⁺	Mg²⁺	Na⁺	H⁺ + Al³⁺	Al	SB	T	V
(g kg^-1)		(mg kg^-1)	(cmol_c kg^-1)								(%)
16.96	0.92	8	0.3	2.7	2.1	0.03	1.82	0.05	5.1	7	73

SV	DF	Mean square
		gs	A	E	T_f	Ci	WUE
Blocks	3	0.001 ^ns	2.19 ^ns	0.031 ^ns	1.41 ^ns	60.28 ^ns	0.01 ^ns
Treatment	4	0.008^*	59.37^**	1.46 ^**	17.75^**	1407.63^**	4.14^*
Residue	12	0.001	2.85	0.8	0.24	19.7	0.09
Total	19
GM		0.27	32.22	5.61	31.85	156.69	5.74
CV (%)		16.07	5.24	5.05	1.55	2.83	540

	Mean square
SV	DF	N	P	K	Ca	Mg
Blocks	3	4.38^ns	0.05^ns	3.90^ns	1.62	1.2
Treatment	4	4.35^*	0.14^*	37.36^**	8.82**	7.32**
Residue	12	1.3	0.03	2.8	0.75	0,54
Total	19	-	-	-
MG	-	13.04	2.04	12.518	4.87	3.87
CV (%)	-	8.74	8.08	13.36	17.78	19.21

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Gas exchanges and mineral content of corn crops irrigated with saline water1 1 This work is part of the first author's master's dissertation, and it was funded by Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP).

ABSTRACT

Gas exchanges and mineral content of corn crops irrigated with saline water¹ 1 This work is part of the first author's master's dissertation, and it was funded by Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP).