Artículos de revistas
Nitrogen Supply To Corn From Sunn Hemp And Velvet Bean Green Manures [fornecimento De Nitrogênio Ao Milho Pelos Adubos Verdes Crotalária Júncea E Mucuna Preta]
Registro en:
Scientia Agricola. , v. 66, n. 3, p. 386 - 394, 2009.
1039016
2-s2.0-69049121015
Autor
Ambrosano E.J.
Trivelin P.C.O.
Cantarella H.
Ambrosano G.M.B.
Schammass E.A.
Muraoka T.
Guirado N.
Rossi F.
Institución
Resumen
Due to their nitrogen fixation potential, legumes represent an alternative for supplying nutrients, substituting or complementing mineral fertilization in cropping systems involving green manuring. The objective of this study was to evaluate the N balance in a soil-plant system involving green manures [sunn hemp (Crotalaria juncea L.) and velvet bean (Mucuna aterrima Piper & Tracy)], both labeled with 15N. They were incorporated into two soils of contrasting textural classes: A clayey Eutrudox and a sandy-clayey Paleudalf, both cultivated with corn. The research was carried out in a greenhouse, using pots containing 6 kg of air dried soil, to which the equivalent to 13 Mg ha-1 dry matter of above-ground mass plus 2.7 or 2.2 Mg ha-1 of velvet bean and sunn hemp roots were incorporated, respectively, with 15N labeling of either shoots or roots. One hundred days after emergence of the corn, the velvet bean residues provided higher accumulation of N in the soil, higher absorption by corn plants and accumulation in the shoot. The green manure decomposition was more intense in the medium-textured Paleudalf. 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