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Reuse of dairy waste in sweet potato fertilization: impacts on productivity
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Reuse of dairy waste in sweet potato fertilization: impacts on productivity
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Journal Article
Reuse of dairy waste in sweet potato fertilization: impacts on productivity
2026
Overview
Abstract There are few studies evaluating the effects of dairy waste application on sweet potato productivity, especially when combined with organic compost fertilization. In this context, the objective was to evaluate the effects of dairy waste fertilization, with or without organic compost, on the yield components and quality of sweet potato. The experiment was conducted under field conditions from April to August 2019 at the UFRPE experimental farm in Garanhuns, Pernambuco, using a randomized block design with different doses of dairy waste (0, 5, 10, and 15 m3 ha−1) in the presence and absence of organic compost, in addition to a control with mineral fertilization. The analyzed variables included ash and starch contents, total and marketable yield, as well as tuber quality parameters. For ash content in the absence of organic compost, the dose of maximum efficiency was 10.21 m3 ha−1, resulting in 0.55% ash, while the number of marketable tubers reached maximum efficiency at 8.05 m3 ha−1, providing 25.09 tubers per plot. The application of dairy waste, either alone or combined with organic compost, promoted increases in sweet potato yield (t ha−1) and quality, showing performance comparable to mineral fertilizer. The highest ash and starch contents were obtained with the exclusive use of dairy waste, highlighting its potential as a sustainable fertilization alternative. Resumo São escassos estudos que avaliam os efeitos da aplicação de resíduos de laticínio sobre a produtividade da batata-doce, sobretudo quando associados à adubação com composto orgânico. Nesse contexto, objetivou-se avaliar os efeitos da adubação com resíduos de laticínio associados ou não ao composto orgânico nos componentes de rendimento e qualidade da batata-doce. O experimento foi conduzido em campo, de Abril a Agosto de 2019, na fazenda experimental da UFRPE em Garanhuns-PE, utilizando um delineamento em blocos casualizados, com diferentes doses de resíduo de laticínio (0, 5, 10 e 15 m3 ha−1) na presença e ausência de composto orgânico, além de uma testemunha com fertilização mineral. As variáveis analisadas incluíram teores de cinzas e amido, produtividade total e comercial, além de parâmetros de qualidade das túberas. Para os teores cinzas na ausência do composto orgânico, a dose de máxima eficiência foi de 10,21 m3 ha-1, proporcionando 0,55% de cinzas, o número de tubérculos comerciais teve dose de máxima eficiência de 8,05 m3 ha-1 proporcionando 25,09 tubérculos por parcela. A aplicação de resíduos de laticínio, isolados ou combinados ao composto orgânico, promoveu aumento na produtividade (t ha-1) e qualidade da batata-doce, apresentando desempenho semelhante ao fertilizante mineral. Os maiores teores de cinza e amido foram obtidos com o uso exclusivo do resíduo de laticínio, evidenciando seu potencial como alternativa sustentável de adubação.
