Absorption of nutrients by cowpea irrigated with saline water under different leaching fractions

Abstract

A B S T R A C TSalinity is one of the main environmental problems that negatively affect plant growth and metabolism, besides being one of the factors responsible for the decrease in the yield of crops, especially in arid and semiarid regions. Thus, the aim of this study was to evaluate the effects of soil salinity on the mineral nutrition of irrigated cowpea. The experiment was conducted in drainage lysimeters in a greenhouse, in a completely randomized design with seven treatments, one irrigated with freshwater (control) and six irrigated with saline water with different leaching fractions (5, 10, 15, 20, 30 and 40%) of the applied irrigation depth, with three replicates. The irrigation with saline water treatments did not affect significantly the contents of macronutrients and Na in the cowpea leaves, while the opposite behavior occurred with the micronutrients.Absorção de nutrientes pelo feijão caupi irrigado com água salina sob diferentes frações de lixiviação R E S U M OA salinidade constitui um dos principais problemas ambientais que afetam negativamente o crescimento e o metabolismo vegetal, além de ser um dos fatores responsáveis pelo decréscimo da produtividade das culturas, sobretudo nas regiões áridas e semiáridas. Objetivou-se com este estudo, avaliar os efeitos da salinidade do solo na nutrição mineral do feijão caupi irrigado. O experimento foi conduzido em lisímetros de drenagem, em casa de vegetação, no delineamento inteiramente casualizado com sete tratamentos constituídos de um irrigado com água doce (testemunha) e seis irrigados com água salina com diferentes frações de lixiviação (5, 10, 15, 20, 30 e 40%) da lâmina de irrigação aplicada e três repetições. A irrigação com água salina não influenciou de forma significativa as concentrações dos macronutrientes e de Na nas folhas do feijão caupi ocorrendo comportamento contrário com os micronutrientes.

Evidence of nitrogen and potassium losses in soil columns cultivated with maize under salt stress

“…Salinity of the irrigation water is one of the main factors that contributes to lesser utilization of nutrients by plants, thus increasing their accumulation in the soil. In turn, development of the root system is compromised due to the increased concentration of salts in the soil (Willadino & Camara, 2010;Prisco et al, 2016;Santos et al, 2016;Tagliaferre et al, 2016).…”

“…Salt-stress effects on plant development are mainly due to osmotic and toxic components, which cause reduction in stomatal opening, photosynthetic activity, nutrient uptake and balance, transpiration, and plant growth (Azevedo Neto & Tabosa, 2000;Munns & Tester, 2008;Willadino & Camara, 2010;Prisco et al, 2016;Tagliaferre et al, 2016). The reduction in water uptake and plant (root and shoot) growth caused by salinity culminates with the reduced capacity of the plant to extract nutrients from the soil, especially those required in larger quantities by plants (Shenker et al, 2003;Ramos et al, 2012;Lacerda et al, 2016b).…”

Evidence of Nitrogen and Potassium Losses in Soil Columns Cultivated With Maize Under Salt Stress

“…Salt-stress effects on plant development are mainly due to osmotic and toxic components, which cause reduction in stomatal opening, photosynthetic activity, nutrient uptake and balance, transpiration, and plant growth (Azevedo Neto & Tabosa, 2000;Munns & Tester, 2008;Willadino & Camara, 2010;Prisco et al, 2016;Tagliaferre et al, 2016). The reduction in water uptake and plant (root and shoot) growth caused by salinity culminates with the reduced capacity of the plant to extract nutrients from the soil, especially those required in larger quantities by plants (Shenker et al, 2003;Ramos et al, 2012;Lacerda et al, 2016b).…”