Recovery of phosphorus fertilizer in potato as affected by application strategy and soil type |
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Authors: | J E Ekelöf J Lundell H Asp E S Jensen |
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Institution: | Department of Agrosystems, Swedish University of Agricultural Sciences, Box No. 104 Alnarp, 230 53 Sweden |
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Abstract: | Phosphorus (P) fertilizers are usually supplied prior to or at planting of potato even though most P is taken up 40 to 80 d after emergence. This may lead to inefficient P use as a result of P leaching or fixation in the soil. This study evaluates the effects of split P application at multiple times during the growth period according to the plant's need for P. Potato (Solanum tuberosum L. cv. Ditta) was grown in pots in climate chambers, and radioactive 32P isotope was used to distinguish between the fertilizer and soil‐derived P sources. Two soils were tested in combination with five application rates of P, and the plants were harvested at four dates. The results show that the recovery of P fertilizer can be significantly enhanced if the P supply is split. The result also showed that the proportion of soil‐derived P, accumulated in the plant, was significantly reduced both when more fertilizer P was applied to the soil and when P supply was split into several applications. The positive effects of multiple P applications on the P recovery were greatest in the soil with low P status and low buffer capacity. |
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Keywords: | 32P fertilizer efficiency phosphate phosphorus use‐efficiency P utilization |
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