Use of radioactive phosphorus in soil fertility research: mobility in an acidified soil
1997
Janat, M. (AEC, Damascus (Syria)) | Stroehlein, J. (University of Arizona (USA)) | Ryan, J. (ICARDA, Aleppo (Syria))
The use of isotopes has added greatly to our knowledge of the agricultural sciences. Much of the detailed knowledge of soil reactions resulting from fertilizer phosphorus applications, as well as rates of uptake by plants, have been attributed to radioactive P. This element is invariably deficient in agricultural soils and has to be rectified by chemical fertilizer application. However, P fertilizer-use efficiency is low largely due to adsorption/precipitation reactions that, in turn, cause limited mobility and positional availability for plant uptake. This study illustrates the use of 32P to evaluate mobility in acidified sandy loam soil in columns. Though acidification is unlikely to be of relevance in dryland areas of WANA, the process may be pertinent to fertilizer application from point-sources, as in drip irrigation. The quest to improve P use efficiency is a daunting one. The data showed that localized acidification promoted considerable P movement. The implications are potentially important for the region's agriculture
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