Abstract
The replenishment of phosphorus (P) in the soil solution is of considerable importance from the standpoint of plant nutrition, since the quantity of inorganic P in the solution phase at any time, is usually insufficient to meet the crops’ requirements during the whole growing season. Acidification is a natural process in the environment; however, human activity often increases this tendency. Through this study we are concerned in the P recovery from soil solid phase that have received different levels of P-additions and of acidification applying three different water extraction methods.
A calcareous loamy soil, pHH2O=7.9 was incubated with 0, 80 and 320 mgPkg−1 soil for one month. Four different levels of P-acidification (pH 7.9, 7.3, 6.0 and 4.5) were adjusted by adding calculated volumes of HCl and incubating the soil samples for further one month, then equilibrated with different rates of phosphorus as 0, 80, 160 and 240 μgP10cm−3. The desorbed quantity of phosphorus was determined applying EUF, HWP and multistep desorption methods.
Some part of the added phosphorus can be recovered by all methods, depending on the dose and time of P addition (previous or recent), on acidity of the soil and on the method used. The desorbable phosphorus amounts are in average 19 % of sum of P-loading at 0 mgPkg−1 level, and 31 and 64 % at 80 and 320 mgPkg−1 levels, respectively. Phosphorus recovery is generally more in acidified soil then in non acidified one but at high fertilizer dose it is somewhat less.
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Füleky, G., Tolner, L. & Anas, W. Effect of Acidification on Recovery of Fertilizer Phosphorus with Three Water Extraction Methods. CEREAL RESEARCH COMMUNICATIONS 34, 183–186 (2006). https://doi.org/10.1556/CRC.34.2006.1.46
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DOI: https://doi.org/10.1556/CRC.34.2006.1.46