Abstract
ABSTRACT: The aim of this study was to evaluate the performance of Tifton 85 grass cultivated in soil columns and fertilized with different wastewater doses of swine slaughterhouse. The experiment was conducted in the Environmental Engineering Center and Sanitary of UFLA/MG in PVC columns filled with Dark Red Latosol (Oxisol) and randomly distributed. The treatments applied with nitrogen based load (300 kg ha de N years−1) consisted of four doses of SW and AQT0 control at random. Three cuts were performed, at 60, 90 and 120 days after planting. The highest yields were 10.06, 16.82 and 20.39 t ha−1 in AQT0, AAT4 and AAT3 treatments, respectively. With the increase of nutrients by N rates and root development of Tifton 85 grass, we observed higher extractions of N, P and K in the second and third cut, with maximum extraction of 384 and 10.3 kg ha−1 of N and P in the higher dose treatments (AAT4), while the maximum extraction of the potassium was 117.7 kg ha−1 in the AAT3 treatment. There was productivity restriction in the third cut due to the reduction of availability of essential nutrients and losses by leaching.
Highlights
Due to the scarcity of water resources and the growing demand for good quality water, several studies have been conducted over the years in order to search for viable alternatives to irrigation using lower quality water
The control treatment AQT0, at the dosage of 30 kg ha-1 of N, 110 kg ha-1 of PT and 40 kg ha-1 of K, provided a dry matter yield of 10.06 t ha -1, being 277% higher than the yield of 3.62 t ha-1 obtained in the AAT1 treatment
There was no statistical difference between the data, maximum yields of 20.39 (AAT3) were observed, after 116 days of monitoring, the highest slaughterhouse wastewater (SW) dosage increased the yield of 19.26 06 t ha-1 ( AAT4)
Summary
Due to the scarcity of water resources and the growing demand for good quality water, several studies have been conducted over the years in order to search for viable alternatives to irrigation using lower quality water. Silva et al (2011) argue that the reuse of wastewater for irrigation purposes contributes to the controlling of environmental pollution, saving water and fertilizers, recycling nutrients and increasing agricultural production. According to Cabral et al (2011), the disposal of wastewater in the soil, as an alternative of final destination, in addition to water source, promotes the nutritional increment for the development of cultivars, reducing production costs. The fertirrigation with wastewater offers socioeconomic and environmental benefits, mainly the reduction of effluent release in the bodies of water and the recovery of nutrients (RodríguezLiébana et al, 2014), allowing to reduce the use of chemical fertilizers (Gil & Ulloa, 1997). In comparison to surface waters and/or groundwater, the use of wastewater in irrigation increases biomass production and improves crop productivity (Jang et al, 2012; Mojid et al, 2012). Finding a balance between the uses of these waters in conjunction with mineral fertilization is of great necessity, reducing fertilizer costs, in addition to providing a noble destination for these waters, increasing production, reducing fertilizer costs and increasing profitability of the producer
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