000			02859nab a2200325 i 4500
003			BR-BrBNA
005			20250508122623.0
008			250508b2020 bl.mr|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aP33
100			_aGuedes, Rafael Silva
100			_aAlleoni, Luís Reynaldo Ferracciú
100			_aCorreia, Benedito Luiz
100			_aAlves, Luis Wagner Rodrigues
100			_aRamos, Sílvio Junio
100			_aFernandes, Antonio Rodrigues
245			_aTillage systems and cover plants change organic fractions of phosphorus in oxisol of eastern Amazonia
500			_aPublicação on-line; 43 ref.; 4 tables; Sumaries (En)
520			_a ABSTRACT: Due to the large extent of degraded areas in the Amazon, the use of conservation systems is very important to contain the advance of the agricultural frontier, and may favor the availability of nutrients such as phosphorus (P). This study evaluated effect of tillage systems on and cover plants distribution of organic P fractions (Po) in oxisol under soybean and grasses in crop successions. The experimental design was completely randomized with four replicates and five treatments: (i) conventional tillage (CT) with annual soil tillage; (ii) no-till (NT) in succession with Urochloa ruziziensis (NT1); (iii) NT in succession with U. brizantha (NT2); (iv) NT in succession with Panicum maximum (NT3); and (v) a control consisting of a fragment of native vegetation (NV). The Po fractions were quantified at depths of 0-5, 5-10, and 10-20 cm, before and after soybean cultivation and the P fractions were analyzed. The samples at a depth 0-5 and 5-10 cm had increased levels of biomass P in the NT1 and NT2. In addition, at depths of 0-5 and 5-10 cm, the treatments in no-tillage systems accumulated the most of the Po labile fractions. These results showed that conservation systems tend to accumulate most of the P fractions in soil through decomposition of organic residues. Thus, no-tillage system was shown to be important for Po supply, where the use of U. brizantha ‘Piatã’ (NT2) favored higher levels of organic P in labile and moderately labile fractions in soil, which was considered the best alternative for Po supply among the species tested. Key words: Glycine max, organic phosphorus fractionation, humic fractions, no-till.
650			_aSOJA
650			_aGRAMÍNEA
650			_aANÁLISE DO SOLO
650			_aSISTEMA DE CULTIVO
650			_aAMAZÔNIA
650			_aPLANTA DE COBERTURA
773	0		_01365 _9344637 _dCampinas-SP Instituto Agronômico - Coordenadoria da Pesquisa Agropecuária 1941 _o2024-4959 _tBragantia (Brazil) _x0006-8705 _gv. 49 p. 434-446; (2020) _wBR2025001025
856			_uhttps://www.scielo.br/j/brag/a/LpmjtN9mSswVdJdncWGSDvb/?format=pdf&lang=en
942			_cANA
999			_c331383 _d331383