Application of swine wastewater for irrigation of Tifton 85 grass: Part I-productivity and nutritional quality

Abstract

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.

Grass production Tifton 85 and nutrient extraction with swine wastewater doses

“…, cycle of 28 days on Tifton 85, and verified a production of 151 kg ha -1 day -1 of dry matter at the highest dose. Gomes et al (2018) obtained higher productivity, equal to 189 kg ha -1 day -1 of dry matter using dose of 300 m 3 ha 1 . Andrade et al (2012) in an experimental area on the campus of Rio Paranaiba UFV evaluated the forage accumulation and managed in the intensive irrigated system.…”

Thermal time in nitrogen and boron application on irrigated Mombaça grass “Guinea grass”

“…Although Brazilian beef cattle production uses extensive systems, the proper handling of pasture is a challenge for the farmers due to the growth of pasture influenced by climatic variables that involve energy flow into the environment [6]. In tropical areas, higher temperatures contribute to forage plants growing, and associate with correct pasture handling, it is possible to provide a higher production [8,10,16]. Nevertheless, during the winter, the irrigation application under mild temperature reduces pasture production due to the productivity of tropical grasses, mainly influenced by photoperiods that stimulate floral induction [2].…”