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Cellulose Acetate Film and Layered Double Hydroxide as Determination Method of Available Phosphorus in the Soil

Journal of Agricultural Science and Technology(B) 2018年第7期8卷 420-432页

作者： Gustavo Franco de Castro Jader Alves Ferreira Allan Robledo Fialho e Moraes reinaldo Bertola Cantarutti Frederico Garcia Pinto Jairo Tronto Roberto Ferreira Novais Department of Soil University of VicosaAv.Peter Henry RolfsBulding Silvyo Starling BrandaoCEP 36570-000Vicosa(MG)Brazil Department of Chemistry University of VicosaRio Paranaiba CampusHighway MG-230KM 07CEP 38810-000Rio Paranaiba(MG)Brazil

The determination of available phosphorus(P)in soil is essential to the evaluation of the current fertility status,and therefore,for recommending the required phosphate fertilizers for the cultivation of *** mostly used extractants around the country are Mehlich-1(M-1)and anionic resins(AR)and mixed resins(MR).However,there are still controversies in relation to the method that should be used,due to of particularities of each ***,the main objectives of this work was to assess the applicability of films of binary combination between cellulose acetate(CA)biopolymer and calcinated layered double hydroxide(LDH-c),named CAF-LDH-c,as a new extractor of available P in *** this,two experiments were set *** the first one,sub-samples of an Oxisol layer 0-20 cm were used and submitted to increasing doses of total P(0,250,750 and 2,250 mg/dm3)in the form of monoammonium phosphate(MAP)at different incubation time(5,30,60 and 90 d).In the second experiment,samples of 20 soils from different origins and contents of available P were used with distinct chemical and physical *** analysis of available P by M-1,AR,MR,Mehlich-3(M-3)and CAF-LDH-c extractants was done in both *** efficiency of the extractants was evaluated by Pearson’s linear *** correlation between values of P extracted from soil in the first experiment was highly significant among all extraction methods used,including for *** the second experiment,CAF-LDH-c showed significant correlation(p<0.01)with M-1,M-3,AR and ***,the significant correlations of the extractant being tested(CAF-LDH-c)with those usually used indicates the possibility of this new method of routine laboratories for assessing the P availability of for the cultivation of crops.

关键词： Available P Mehlich-1 Mehlich-3 anionic resin mixed resin

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