caa a22 4500 463208862 CHVBK 20180405153134.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1007/s10705-006-9054-6 doi (NATIONALLICENCE)springer-10.1007/s10705-006-9054-6 Evaluation of iron oxide impregnated filter paper method as an index of phosphorus availability in paddy soils of Tanzania [Elektronische Daten] [C. Shekiffu, J. Semoka] Phosphorus is a major yield limiting nutrient in rice production and yet most soil test methods for predicting P availability to plants have a number of shortcomings especially under flooded conditions. The objective of this study was to evaluate the iron oxide impregnated filter paper (Pi) method for assessing changes in P availability in soils subsequent to flooding and to determine the suitability of the method in assessing P status in paddy soils. The results indicated that available P increases considerably (between 34% and 256%) subsequent to flooding and this affected responsiveness of the soils to P application. Two versions of the Pi method namely; the Pi method used under flooded conditions (Pi-Pf) and Pi strips embedded directly in flooded soils (Pi-Pfe) were effective in assessing P availability in paddy soils. The two Pi methods were better correlated with rice dry matter yield than the traditional soil tests and are hence recommended for use in soil testing under flooded conditions. The tentative critical levels of P for the two procedures under pot conditions were 22mg/kg for Pi-Pf and 15mg/strip for Pi-Pef. Springer Science+Business Media B.V., 2006 Available P nationallicence Flooded soils nationallicence Paddy soils nationallicence Tanzania nationallicence Critical P level nationallicence Shekiffu C. National Soil Service, Ministry of Agriculture and Food Security, P.O. Box 5088, Tanga, Tanzania aut Semoka J. Department of Soil Science, Sokoine University of Agriculture, P.O. Box 3008, Morogoro, Tanzania aut Nutrient Cycling in Agroecosystems Kluwer Academic Publishers 77/2(2007-02-01), 169-177 1385-1314 77:2<169 2007 77 10705 https://doi.org/10.1007/s10705-006-9054-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10705-006-9054-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shekiffu C. National Soil Service, Ministry of Agriculture and Food Security, P.O. Box 5088, Tanga, Tanzania aut NATIONALLICENCE 700 1- Semoka J. Department of Soil Science, Sokoine University of Agriculture, P.O. Box 3008, Morogoro, Tanzania aut NATIONALLICENCE 773 0- Nutrient Cycling in Agroecosystems Kluwer Academic Publishers 77/2(2007-02-01), 169-177 1385-1314 77:2<169 2007 77 10705 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer