PHOSPHORUS FERTILIZATION AND SOIL TEXTURE AFFECT POTATO YIELD

• Autor(a) principal: Lopes Martins, Jessyca Dellinhares [UNESP]
• Data de Publicação: 2018
• Outros Autores: Soratto, Rogerio Peres [UNESP], Fernandes, Adalton Mazetti [UNESP], Martins Dias, Pedro Henrique [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/1983-21252018v31n302rc; http://hdl.handle.net/11449/164258
• topic: Solanum tuberosum; Sandy soil; Clayey soil; Dry matter; Phosphorus accumulation

Potato (Solanum tuberosum L.) is a nutritionally demanding crop, and phosphorus (P) is a nutrient that exerts a large effect on tuber yield. However, as the availability of P is influenced by soil texture, there are doubts about how P supplementation affects the growth and yield of potato plants in different soil textures. Thus, here we aimed to evaluate the effect of P fertilization and soil texture on the nutrition, growth, tuber yield, and P use efficiency (PUE) of potato plants. The experiment was conducted under greenhouse conditions in a randomized block design with a 4x2 factorial scheme and five replications. The treatments were represented by four P rates (10, 50, 100, and 200 mg dm(-3) P) and two soil textures (clayey and sandy). The concentrations of P, Ca, and Mg in the leaves were higher in sandy soil, and P rates increased the concentrations of N, P, and Ca in the leaves of potato plants. Phosphorus fertilization increased plant growth, the amount of P accumulated in the shoot, and tuber yield in both soils; this trend was stronger in the potato cultivated in the clayey soil than in the sandy soil. The applied-PUE was not affected by soil texture. In the potato cultivated in the sandy soil, the taken up-PUE was reduced due to the decrease in dry matter production and an increase in P concentration in the organs of the plant with higher P fertilizer rates.