Publikationsdatum:
2014-02-12
Beschreibung:
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 32 P 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.
Print ISSN:
1436-8730
Digitale ISSN:
1522-2624
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
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