Biochar and swine wastewater: Effects on soil fertility of different textures and corn nutrition

Abstract

The use of organic waste in agriculture has stimulated the search for technologies that reduce environmental pollution. Among the residues are the biochar and swine wastewater (SW), which incorrectly disposed cause negative impacts, however, when combined, they can enhance agricultural production, due to the synergism between both.In this sense, the objective was to evaluate the influence of doses of biochar, from conilon coffee straw, combined or not with swine wastewater diluted to 50% (SW50%), on the nutrient content in medium and clayey texture soils and in the corn plant tissue. The experiment was carried out in a greenhouse, with five doses of biochar, two irrigation waters and two soils, with three repetitions. The pH, P, K + , Ca +2 , Mg +2 , Zn +2 and Na + in the soil and N, P, K, Ca, Mg, Zn and Na in plant were evaluated. The addition of biochar in doses linearly increased the levels of P and K + in both soil textures, with synergy when irrigated with SW50%. The SW50% provided a nutrients increase in the corn plant tissue. The agricultural use of biochar from conilon coffee straw was important to increase the content of P and, mainly, K in the aerial part of corn.

Impact of historical soil management on the interaction of plant-growth-promoting bacteria with maize (Zea mays L.)

“…Deionized water were added in sufficient quantity to make up around 50% of the total pore volume (TPV) [ 51 ]. To maintain 50% of TPV, similar to 365.0 g of deionized water by pot, we height the experimental unit (pots + soil + water needed to maintain 50% of the TPV) daily to maintenance of soil moisture.…”

Corn crop responds positively to fertigation with black water from sewage treated by decentralized anaerobic system

“…The application of sewage sludge biochar (SSB) alone and together with NPK in a clayey texture soil increased corn yield compared to control (without SSB and without fertilizers), but no differences were found between both (Figueiredo et al, 2019). Irrigation with swine wastewater diluted to 50% in soils with medium texture (Red-Yellow Oxisol) and clayey texture (Red-Yellow Ultisol) increased the levels of N, K, Ca, Mg and Zn in the aerial part of corn (Cunha et al, 2021). Futhermore, industrial saline wastewater application (0, 10, 20, 40 and 60 m 3 ha -1 year -1 ) in a corn-soybean rotation on an Oxisol significantly increased corn (all rates) and soybean (only with the highest rate) yields around 103 -250% and 50%, respectively, in comparison with no wastewater application, but the use of high rates of that wastewater could cause soil salinization (Fink et al, 2021).…”