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

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 CO 2 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 CO 2 concentration and transpiration in field maize plants. Salt stress reduces the levels of N, P, K, Ca and Mg mineral elements in maize leaves.

Bacillus aryabhattai Mitigates the Effects of Salt and Water Stress on the Agronomic Performance of Maize under an Agroecological System

“…This response may be related to the conditions of low CO2 availability due to stomatal closure and physiological imbalances linked to the high salt content, reaffirming that the chlorophyll content is influenced by both biotic and abiotic factors [42]. Different results, with a reduction in plant transpiration when the electrical conductivity of the irrigation water was increased, were found by [59], cultivating irrigated maize under a water regime of 100% of the ETc. Reference [15] also showed a reduction in transpiration in maize irrigated with brackish water.…”

“…Different results, with a reduction in plant transpiration when the electrical conductivity of the irrigation water was increased, were found by [59], cultivating irrigated maize under a water regime of 100% of the ETc. Reference [15] also showed a reduction in transpiration in maize irrigated with brackish water.…”

“…Salt and water stress induce osmotic adjustment, which is considered an important mechanism for the maintenance of water uptake and cell turgor under stress conditions [58]. Different results, with a reduction in plant transpiration when the electrical conductivity of the irrigation water was increased, were found by [59], cultivating irrigated maize under a water regime of 100% of the ETc. Reference [15] also showed a reduction in transpiration in maize irrigated with brackish water.…”

Bacillus aryabhattai Mitigates the Effects of Salt and Water Stress on the Agronomic Performance of Maize Under an Agroe-Cological System

“…Salt and water stress induce osmotic adjustment, and are considered an important mechanism for the maintenance of water uptake and cell turgor under stress conditions [54]. Different results, with a reduction in plant transpiration when the electrical conductivity of the irrigation water was increased, were found by [55], cultivating irrigated maize under a water regime of 100% of the ETc. [14] also showed a reduction in transpiration in maize irrigated with brackish water.…”

“…Following the trend for transpiration under salt stress, leaf temperature gradually increased. It should be noted that plants under salt stress show great difficulty in absorbing water from the soil; as such, there is an increase in internal temperature, since water helps in the thermal regulation of plants, even under conditions of high transpiration [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. It is worth noting that transpiration via movement of the stomata helps in reducing leaf temperature (cooling), which is crucial during the day when the leaf absorbs large amounts of energy from the sun [38].…”