MINERALIZAÇÃO DE FÓSFORO SOB DIFERENTES RESÍDUOS ORGÂNICOS EM NEOSSOLO REGOLÍTICO E ARGISSOLO VERMELHO

Abstract

The quality of the manure and availability are heterogeneous and are subject to conditions which dictate the rate of decomposition and mineralization of nutrients. However the knowledge of the characteristics and the dynamics of mineralization, the local climate. This study aimed to evaluate phosphorus mineralization coming from different types of manure on soils with textures cultivated contrasts with Buffel grass (Cenchrus ciliares L.) as test plant, being mounted in a greenhouse experiment in DSER the Universidade Federal da Paraíba. In the city of Areia and Remigio - PB, were collected soils of contrasting textures, Entisol and an Ultisol 0.2 m depth, containing 4.6 to 23% clay, respectively. The manure of cattle, sheep, swine, poultry litter and laying hens were collected in County properties Boa Vista - PB. Using as reference the cattle manure as a reference dose of 4Mg.ha-1, which set the other sources for the same dose of N (204 kg ha-1). Introducing the randomized design, the experiment was arranged in three replicates and factorial arrangement of treatments (2 x 6) with 2 different soils, 5 organic sources more witness, obtaining 36 experimental units. After incubation was carried out to obtain sowing 3 plants per pot keeping moisture at 50% of the pore volume were weighed daily and water replacement. The cuts were taken at 40, 70 and 100 DAE. The dry matter of shoots was ground and analyzed for total N content (Kjeldahl) and P after nitric perchloric acid digestion. Tukey's test at 5% probability for the sum of the cuts and calculated soil efficiency was realized. Regarding the supply of P to plants in Entisol, the best was the pig manure and Paleudult the witness had the best performance. Independent of the characteristics of each source and ownership of land, the poultry manure was what produced the highest amount of MS.