COATED DIAMMONIUM PHOSPHATE EFFECT ON SOIL-NITROGEN LIXIVIATION AND ITS RELATION WITH PROPERTIES KINETICS

Citation
L. Garcia et al., COATED DIAMMONIUM PHOSPHATE EFFECT ON SOIL-NITROGEN LIXIVIATION AND ITS RELATION WITH PROPERTIES KINETICS, Communications in soil science and plant analysis, 26(19-20), 1995, pp. 3405-3416
Citations number
19
Categorie Soggetti
Agriculture Soil Science","Plant Sciences","Chemistry Analytical
ISSN journal
00103624
Volume
26
Issue
19-20
Year of publication
1995
Pages
3405 - 3416
Database
ISI
SICI code
0010-3624(1995)26:19-20<3405:CDPEOS>2.0.ZU;2-2
Abstract
Slow-release fertilizers were prepared by coating diammonium phosphate (DAP) with rosin and tricalcium phosphate. The DAP dissolution kineti cs in water of these products is of the Ist order, leading to the conc lusion that the values of the dissolution rate constants depend on the coating percentage. A glasshouse test with rye grass was carried out in order to evaluate the efficiency of the fertilizers as regards nitr ogen (N) uptake by the plant and N lixiviation in high leaching condit ions. It has been proved that by using coated products the loss of N w as reduced, but the yields of dry matter were still good as was the N uptake by the plant. It has also been proved that losses through lixiv iation are lower when the fertilizers are mixed with the soil. Finally it was possible to establish linear correlations between kinetic indi ces deduced from the solubility of the products in water and indices d educed from the response of the soil-plant system.