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.
Highlights
The corn crop is used as a food source and for energy production
Irrigation is a technique that has contributed most to the increase in food production, inefficient management, often practiced by farmers, associated with climatic conditions can increase the amount of salts deposited in the soil, affecting the germination of seeds, initial plant growth and crop yield (Freire et al 2018, Sousa et al 2017; Cruz et al, 2021)
The soil was characterized as sandy loam with density of 1.3 kg dm-3, electrical conductivity of the saturation extract (ECse) of 0.23 dS m-1, and hydrogenation potential = 6
Summary
The corn crop is used as a food source and for energy production It is an important source of food and income for many semi-arid producers. It is a C4 plant with high photosynthetic rates (Taiz et al 2017), the photosynthetic process acts through light energy present in the leaves, acting in the formation of carbohydrates, which are allocated to the vegetative and reproductive organs (Gomes et al 2011). Irrigation is a technique that has contributed most to the increase in food production, inefficient management, often practiced by farmers, associated with climatic conditions can increase the amount of salts deposited in the soil, affecting the germination of seeds, initial plant growth and crop yield (Freire et al 2018, Sousa et al 2017; Cruz et al, 2021). The aim of this study was to evaluate the effect of irrigation water in different salt concentrations on gas exchange and leaf contents in maize plants
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