Phosphorus as a mitigator of the effects of water stress on the growth and photosynthetic capacity of tropical C4 grasses
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Universidade Estadual de Maringá
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Water deficiency during the dry seasons infl uences the relationship between water and gas exchange in tropical grasses, reducing their productive potential. In addition, th e phosphorus (P ) deficiency Brazilian soils adds to the set of factors limiting crop pr oduction. In this context, the objective of this study was to evaluate the responses of different tropical forage species to phosph orus supplementation as mitigating the damage caused by water stress. Seeds of Urochloa brizantha cv. MG-4, Urochloa decumbens cv. Basilisk, Panicum maximum cv. Áries, Panicum maximum cv. Tanzânia and Paspalum atratum cv. Pojuca were germinated in pots containing 10 liters of red-yello w Acrisol type soil. Exper iments were conducted by combining levels of phosphorus, 8,0 and 100,0 mg of P dm -3 , with two irrigation regimes, 100 and 40% replacement of transpired water. Th e biometric parameters, photosynthet ic capacity, leaf water potential and soil chemical characteristics were evaluated, an d the data was submitted to analysis of variance (ANOVA, p < 0.05), and subsequently the means were compared using a Tukey test (p < 0.05). The results showed for tropical grasses grown under water st ress, there is a clear mitigating effect of phosphorus supplementation, especially on the maintenance of biomass growth.
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