The scarcity of good water quality in semiarid region, combined with the high cost of pumping, has been the main limiting factor for increasing the irrigated area. The use of saline water for irrigation is a very common in semiarid zones, which can result in the soil salinization if irrigation management is not appropriated. To evaluate the biomass production, biochemical components and water consumption of Tanzania grass (Panicum maximum) irrigated with water salinity (1.5, 3.0, 4.5 and 6.0 dS m-1) an experiment in greenhouse was carried out in the Universidade Federal Rural do Semi-Árido, Mossoró, Rio Grande do Norte State, Brazil. The variables dry matter, crude protein, ashes, cellular damage on leaves and consume water in the first and second cut of the grass were analyzed under completely randomized design with five treatments and six replications. Salinity water up to 6.0 dS m-1 can be used for irrigation of Tanzania grass plants, with small yield losses. Increased salinity reduces water consumption and increases the water use efficiency of Tanzania grass. Tanzania grass plants have increased protein content when subjected to saline stress, which is a mechanism of action to osmotic adjustment and allows the reduction of plant leaf damage in the second cycle.
Professor (a) da Universidade Federal Rural do Semi-Árido/RN 4 Graduando em Zootecnia -UFERSA Resumo: A salinidade dos solos reduz a absorção de água pelas plantas, interferindo no metabolismo e, consequentemente, no crescimento e produção das mesmas. Com o objetivo de estudar os efeitos de diferentes níveis de salinidade da água de irrigação no consumo hídrico do capim Panicum maximum Jacq, cv. Tanzânia, foi desenvolvido um experimento em ambiente protegido na Universidade Federal Rural do Semi-Árido, localizado no município de Mossoró/RN. Os tratamentos consistiram na aplicação cinco salinidades de água de irrigação (S 1 = 0,5; S 2 = 1,5; S 3 = 3,0; S 4 = 4,5 e S 5 = 6,0 dS/m) em delineamento inteiramente casualizado com cinco tratamentos e seis repetições. O consumo hídrico do capim Tanzânia decresceu linearmente com o aumento da salinidade da água de irrigação, demonstrando que a salinidade da solução no solo reduz a disponibilidade de água para as plantas devida o efeito osmótico. Palavras-chave: condutividade elétrica, Panicum maximum Jacq, manejo de água Consume Water of the Tanzania Grass Irrigated with Waters Saltiness
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