Abstract
ABSTRACT Studies in the past decades have focused on how tuber yield of potato grown on different types of soil is affected by phosphate fertilizer rates. However, little is known about the effects of phosphorus availability in the soil and of phosphate fertilization on nutrient uptake and removal by the main potato cultivars currently grown in Brazil. Thus, in this study we investigated the influence of P fertilization rates on dry matter (DM) yield and nutrient uptake and removal in [...]
Highlights
The tuber yield of potato (Solanum tuberosum L.) has increased considerably over the past decades (Faostat, 2015) due to improvements in management practices (Fernandes and Soratto, 2012a) and use of more productive cultivars (ABBA, 2010)
At the highest P fertilization rates, leaf analysis showed that the nutritional status of potato plants was not significantly changed and no nutritional deficiency was induced, regardless of the soil P availability levels
With the hypothesis that phosphate fertilization differently affects the nutritional demand of each potato cultivar grown in soils with different levels of P availability, the objective of this study was to evaluate the influence of P fertilization rates on dry matter (DM) yield and nutrient uptake and removal for five potato cultivars grown in soils with different levels of P availability
Summary
The tuber yield of potato (Solanum tuberosum L.) has increased considerably over the past decades (Faostat, 2015) due to improvements in management practices (Fernandes and Soratto, 2012a) and use of more productive cultivars (ABBA, 2010). Short crop cycle, and high nutrient requirements of potato (Jenkins and Mahmood, 2003; Fernandes et al, 2011) demand nutrients in readily available form in the soil solution. The largest increases in potato tuber yield have come from P applications, especially in P-deficient soils (Fontes et al, 1997; Alvarez-Sánchez et al, 1999; Rosen and Bierman, 2008; Soratto et al, 2015; Fernandes and Soratto, 2016), K, N, and Ca are taken up in greater amounts by potato plants (Fernandes et al, 2011). P2O5 is applied at amounts up to 500 kg ha-1 above the recommended threshold (Sangoi and Kruse, 1994), even in soils with high P availability
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