Availability of Phosphorus in Cow Slurry Using Isotopic Labelling Technique,
RISOE NATIONAL LAB ROSKILDE (DENMARK)
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Organic fertilizers, e.g., compost, green manure, farmyard manure, and farmyard slurry are not only important in improving the physical properties of soils but also provide mineral nutrients to plants. However, those nutrients in organic form must be mineralized before they are available to plants. Some organic fertilizers, especially farmyard manure and slurry, contain fairly large amounts of organic phosphorus P, which must be mineralized before it can be utilized by plants. For the efficient use of farmyard manure and slurry, however, it is very useful to know their content of readily available P in order to estimate the amount of fertilizer that should be applied to crops. L- and E-value determination are suitable techniques for evaluating available P if the mineralization and immobilization of P in the soil are low during the experimental period. The aim of this experiment was to evaluate the influence of cow slurry on P uptake and to estimate the readily available P in the slurry by using 32p. Keywords Botany Nutrients Biological absorption Labeled substances Agriculture.
- Agricultural Chemistry