Biossólido como adubação em grama esmeralda

Abstract

With the increase of the urban world population, the production of sanitary waste is increasing in such a way that problems with the destination of these materials becomes more and more worrying. Thus, the objective of this study was to evaluate the growth of emerald grass (Zoysia japonica) under different doses of biosolids. The experiment was conducted in pots at the Federal University of Mato Grosso, Sinop-MT, under protected environment. An entirely randomized design was used, with the dosages of biosolids and chemical fertilizer as plots, and days after fertilization (DAA), as subplots, with 6 repetitions for each dosage. The treatments corresponded to different dosages of biosolids (11.8; 15.7 and 19.6 Mg biosolid ha- 1 ) and control with NPK fertilization. The biosolid dosage of 15.7 Mg ha-1 corresponds to the same nitrogen dosage as the NPK fertilization. The mats were monitored until 84 DAA. It is found that the highest biosolids dosage, 19.6 Mg ha-1 , results in the highest value of aerial fresh mass (25.9 g); the highest biosolids dosages (15.7 and 19.6 Mg ha-1 ) generate the highest SPAD index values (42.2 and 40.3) (p≤0.05). Among the biosolids dosages (11.8, 15.7 and 19.6 Mg ha-1 ) there is equality of values for aerial dry mass (10.3; 8.3 and 7.0 g), root volume (148.3; 131.7; 120.8 cm3 ) and surface cover rate at 84 DAA (72, 66 and 50%) (p≤0.05). The lowest dosage of biosolids, 11.8 Mg ha-1 , and NPK fertilization showed statistically equal values for the SPAD index, but lower than the highest dosages of biosolids (p≤0.05). For the other parameters, the NPK fertilization presented average values lower than the fertilization with biosolids. Regarding color perception, the dosages of biosolids differed to a greater degree compared to mineral fertilization. The results show that the use of biosolids in grass production is equivalent or superior to NPK fertilization, thus, the biosolids-based fertilization can be employed in the fertilization of emerald grass.