Nitrogen, Phosphorus and Potassium Accumulation in Watermelon Cultivars Irrigated With Saline Water

Abstract

The use of saline water in agriculture has increased in the Brazilian semiarid due to low availability of good quality water for irrigated agriculture, being the selection of salt tolerant hybrids an alternative to reduce the effect of salinity on nutritional status of plants. So, the objective of this work was to evaluate the effect of salinity of irrigation water in the accumulation and partition of nutrients in the vegetable tissue of watermelon cultivars, in the region of Mossoro in the State of Rio Grande do Norte, Brazil. The treatments studied consisted of applying irrigation water with five electrical conductivities (EC1 = 0.57, EC2 = 1.36, EC3 = 2.77, EC4 = 3.86 and EC5 = 4.91 dS m -1 ), two watermelon cultivars and four samplings times (15; 29; 43 and 60 days after transplanting), arranged in a scheme of split plot(5x2x4) and outlined in complete blocksrandomized with four replications.The accumulated nutrients in plants were influenced by ECw, occurring a loss in comparison with the higher ECw of 24.1 and 36.4% in the accumulationof N and P in the vegetative part of plant and 37.8 and 30.1 % in the accumulation of P and K in the aerial part. The accumulation of N, P and K in the watermelon was influenced by plant age, with reduction at the end of the cycle.

Potential of plant growth promoting bacterial consortium for improving the growth and yield of wheat under saline conditions

“…It is a well-documented effect that a high concentration of Na + not causes a toxic effect on plant growth but also decreases the uptake of other essential nutrients, therefore, causing nutritional imbalances ( Hirpara et al, 2005 ; da Costa and de Medeiros, 2018 ; Bekmirzaev et al, 2020 ). Sodium (Na + ) and potassium (K + ) play a major role in plant physiology under salinity stress.…”

A difusão de tecnologias no meio agrícola na Caatinga – a região de clima semiárido brasileiro

“…Em alguns locais, a água obtida nos poços subterrâneos é salobra e geralmente não potável -oitenta por cento do território no semiárido brasileiro corresponde a formações geológicas com xisto, marga, calcário, silvita, gesso e halita, com grande quantidade de sais de cálcio e magnésio, que deixam a água subterrânea salobra (PESSOA et al, 2016;SHARQAWY, 2020). Mesmo assim, é comum o uso de água com teor moderado a alto de sal na irrigação das lavouras e hidratação de animais, uma ação paliativa à escassez de água, mas que afeta a produção, degrada os solos ao longo dos anos de cultivo e influencia negativamente a sustentabilidade agrícola na região (COSTA; MEDEIROS, 2018;DINIZ et al, 2020;PESSOA et al, 2016;SILVA et al, 2020c). Cabe destacar também que a irrigação não é uma prática viável para a maioria dos pequenos A difusão de tecnologias no meio agrícola na Caatinga -a região de clima semiárido brasileiro agricultores, devido aos custos dos sistemas de irrigação (VISSES; SENTELHAS; PEREIRA, 2018).…”