The use of swine wastewater (SW) for irrigation can be an excellent alternative to increase productivity and quality of pastures. This work was carried out from October 2013 to September 2014 in Dourados -MS. The objectives were evaluation of the productivity and nutritional quality of Tifton 85 grass (Cynodon spp.) under different doses of SW in the presence and absence of normal water irrigation. The experiment was set in a randomized block with split plots design, including water irrigated and non-irrigated in the main plots and four doses of SW in the subplots (75, 150, 225 and 300 m 3 ha -1 cut -1 ), with four replicates. The total forage yield and the bromatological value (crude protein, neutral and fibre detergent acid and dry matter digestibility) were evaluated. There was a significant effect of irrigation and SW doses on total dry matter yield, reaching 41.4 Mg ha -1 year -1 using the highest dose of SW (300 m 3 ha -1) and irrigation use. Irrigation also provided higher crude protein levels, increasing with linear adjustment to SW doses, reaching 17.9% in the annual average. The neutral detergent fibre and the acid detergent fibre presented lower results under irrigation, reaching 65.4 and 32.6% in the annual average, respectively, and linearly decreased using SW doses. Inverse behavior was observed in the in vitro digestibility of dry matter, which was higher under irrigation, reaching 69.5% in the annual average and presenting linear growth according to doses of SW.
ABSTRACT:The use of irrigation and fertilization with swine wastewater (SW) can be an excellent alternative to increase the production and pasture quality. The work was carried out from October 2013 to September 2014 in Dourados -MS, and aimed to evaluate the production and nutritional quality of Tifton 85 grass (Cynodon spp.) under different rates of SW, in the presence and absence of irrigation. The experiment design was randomized blocks in a split plot scheme, with irrigation and without irrigation in the plots, and four rates of SS in the subplots: 75, 150, 225 and 300 m 3 ha -1 cut -1 , with four replications. There was a significant effect of irrigation and SS rates on Total dry matter, reaching 41.4 Mg ha -1 y -1 with the highest dose tested and associated with the use of irrigation. Irrigation also provided higher levels of crude protein, increasing with linear adjustment to SS rates, reaching 17.9 % in the annual average.The neutral detergent fiber and the acid detergent fiber presented lower irrigation results and decreased linearly at the rates of SS, reaching 65.40 and 32.55% in the annual average, respectively. It was observed an inverse behavior of the "in vitro" digestibility of dry matter, which was higher under irrigation, reaching 69.5% in the annual average and presenting linear growth for the SS rates.KEYWORDS: organic fertilization, botanical composition, dry matter production, forage quality, sprinkler irrigation. APLICAÇÃO DE DEJETO LÍQUIDO DE SUÍNO E IRRIGAÇÃO DE CAPIM
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