Cultivo do capim Tifton 85 sob adubação orgânica e irrigação com diferentes qualidades de água.

Abstract

When speaking of the Brazilian semi-arid region, scarcity of water is one of the hallmarks of this region, so the reuse of liquid and solid wastes has become a viable practice for the sustainability of agricultural production, since in addition to being able to supply the needs The nutrients present in these residues. Faced with this, the present research proposes to evaluate the irrigation of Tifton 85 grass with treated domestic wastewater and artesian well water, together with the nitrogen fertilization available in poultry litter. For this purpose, grass plants were cultivated in pots under protected environment conditions distributed in a completely randomized experimental design, in a 5 x 2 factorial scheme, with four replications. Five doses of nitrogen were tested through organic fertilization from avian beds (0, 15, 30, 45 and 60 kg N ha-1) and two irrigation water qualities (domestic and artesian wells). The plants were submitted to five consecutive cuts performed every 35 days after the standardization cut. The irrigation of the plants was carried out daily where the water replenishment was performed as a function of evapotranspiration of the crop. To evaluate the effect of nitrogen doses and irrigation water quality, analyzes of Tifton 85 grass were performed: Plant height (AP); The production of green mass (MV) and dry mass (DM); Water productivity (PDA); The nutritive value of the Tifton 85 grass determined the levels of crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (FAD), as well as the chlorophyll content of leaves of Tifton 85 grass, With the help of SPAD (Soil Plant Analysis Development). With the results obtained, irrigation with treated domestic wastewater contributed positively to obtaining plants with satisfactory growth, with high chlorophyll indices, the same tendency observed for the nitrogen content of the Tifton 85 aerial part. The mass production also was positively influenced by the use of wastewater in irrigation. In addition, irrigation with treated domestic wastewater proved to be an excellent source of chemical nitrogen substitution for Tifton 85 grass contributing to obtain nutritional values within those found in the literature.