Abstract
Nitrogen, phosphorus and potassium are nutrients that are directly involved in the entire life cycle of plants. Wood ash is solid with high or low concentrations of phosphorus and potassium depending on the material of vegetable origin. The objective of the present study was to evaluate the concentrations of nitrogen, phosphorus and potassium in tropical grasses in 2 cultivars of Brachiaria brizantha resulting from differing doses of wood ash. Completely randomised design in a 6x2 factorial with 6 doses of vegetable ash (0; 3; 6, 9; 12 and 15 g dm-3) and 2 cultivars of B. brizantha (Marandu and Xaraes) with 6 replications. In the first cut, the nitrogen concentration in the shoots of Marandu grass increased by 65.13%, and the potassium concentration increased by 36.12 and 42.37% in the Marandu and Xaraes grasses, respectively. In the third section, the phosphorus concentration in the shoots of both grasses increased 38.78%. In the roots of the Marandu and Xaraes grasses, the concentrations of phosphorus and potassium increase by 25.17 and 35.93%, respectively. The wood ash as fertiliser improves the concentrations of nitrogen, phosphorus and potassium in the shoots and roots of the tropical grasses Marandu and Xaraes. Key words: Brachiaria Brizantha, fertiliser alternative, solid waste.
Highlights
The use of solid waste such as the ash plant in agriculture has enabled an alternative form of fertilisation and a way to replace nutrients in the soil, affecting the crop
The objective of the present study was to evaluate the concentrations of nitrogen, phosphorus and potassium in tropical grasses in 2 cultivars of Brachiaria brizantha resulting from differing doses of wood ash
The nitrogen concentration in the shoots of Marandu grass increased by 65.13%, and the potassium concentration increased by 36.12 and 42.37% in the Marandu and Xaraes grasses, respectively
Summary
The use of solid waste such as the ash plant in agriculture has enabled an alternative form of fertilisation and a way to replace nutrients in the soil, affecting the crop. This residue contains varying concentrations of minerals (Mello, 1930) and, once in the soil, works as a corrective fertiliser (Ferreira et al, 2012), improving the soil fertility. The ash improves the soil characteristics and can provide better crop growth as it meets the recommendations for crop need, fertiliser dose and soil class These aspects that relate to alternative forms of fertiliser are relevant for sustainable development, which aims to increase agricultural production and improve the
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