Abstract

SOSA-RODRIGUES, Breno Augusto et al. Nitrogen dynamics of soil in agroecosystems under the effect of green fertilizers. Acta Agron. [online]. 2019, vol.68, n.4, pp.257-264. ISSN 0120-2812.  https://doi.org/10.15446/acag.v68n4.71963.

The green fertilizers (AV) are implemented in agroecosystems to improve and/or restore soil fertility. The objective was to evaluate the nitrogen (N) dynamics of soil in maize and soybean systems under the effect of AV. In a Typic Haplustert located in Valle del Cauca-Colombia, the association Mucuna pruriens var. utilis - corn and, 90 days after sowing, the residues were incorporated as AV or placed on the soil surface as organic mulch (AO). The corn- soybean crops were then planted in an intercalated form and 11 treatments were formulated under the randomized complete block design with a factorial arrangement of 32 +2 with three replications. The main parcels constituted AV, AO and fallow (B). The subplots corresponded to compost fertilization, industrial chemical synthesis fertilizer and no addition. At the same time, corn and soy monocultures managed in a conventional manner were planted as research references. In the stage of flowering and grain filling of the crops, some variables were analyzed, related to the soil: total N, ammonium, nitrate, total inorganic N, organic carbon; in vegetable tissue of corn and soybean: carbon and N. The results indicated that the addition of high quality organic materials, AV/AO, stimulated the mineralization of the C and dynamics of the different fractions of N in the soil, without significant changes in the content of these elements in the plant tissue of the corn and soybean crop.

Keywords : Corn; Soy; Agroecological Practices; Nitrogen; Plant-soil relationships.

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