Água residuária de confinamento bovino na morfofisiologia do capim Megathyrsus maximum cv. Tamani.

Abstract

The use of cattle culture waste as an alternative for pasture fertilization shows that the most modern production systems seek for new forms of management that are more efficient and sustainable. The objective of this work was to evaluate the development of Tamani grass fertigated with confinement wastewater under different irrigation depths. The statistical design was completely randomized with four replicates and six treatments, being: T1 (witness - no application); T2 (100 kg urea + 100 kg kcl); T3 - 12 mm H2O waste (42% N and 12% K); T4 - 24 mm Of H2O waste (84% N and 24% K); T5 - 36 mm Of H2O waste (126% N and 36% K) and T6 (12 mm of H2O wastehouse + 100 kg urea + 100 kg KCl). The parameters evaluated were: plant height, leaf width, number of tillers, total chlorophyll, CO2 assimilation rate, transpiration rate, stomatal conductance and internal CO2 concentration in the leaf. The application of wastewater slides in Megathyrsus maximus cv. Tamani promoted changes in plant development. There was a significant difference in the number of tillers, CO2 assimilation rate, transpiratory rate, stomatal conductance, internal concentration of CO2 in the leaf, total chlorophyll and water use efficiency. For the other characteristics there was no statistical difference between the treatments evaluated. For morphological variables, the 12 mm treatment of H2O residue + 100 kg of urea + 100 kg KCl was higher than the control about 256.86%. For physiological variables, fertigation with wastewater demonstrated superiority with treatments 100 kg of urea + 100 kg KCl, 36 mm of H2O wasteand 12 mm of H2O waste + 100 kg urea + 100 kg KCl. T6 treatment was best observed for morphological characteristics and T5 treatment was best for physiological parameters.