Quality of cover crops in
Southwest Bonaerense under no tillage systems
No-tillage system with fall/winter cover crop (CC)
ensures that large amounts of different types of organic residue are supplied
to the soil. The biochemical composition of each residue, especially its C:N
ratio and lignin, plays an important role in nitrogen (N) and carbon (C) soil
dynamics, as well as the availability of nutrients for the next crop. The objective
of this study was to evaluate the quality parameters of CC based on the
quantity and quality of the residue contributed. The experiments were carried
out on Argiudioles typical of the Coronel Suárez (Pcia. de Bs. As.) Species
used as cover crops were: Oats (Avena sativa L.), Hairy vetch (Vicia sativa L.
Thell.), Clover persia ‘‘grazing’’ (Trifolium resupinatum L var. ‘‘Lightning’’), Clover Persia ‘‘coverage’’
(Trifolium resupinatum L. var. ‘‘Laser’’). The determinations
were: a) Production of forage (Mg MS ha-1), b) N, c) neutral
detergent fiber (NDF) and acid (FDA), nonstructural carbohydrates (CNES),
carbon (C%) and Lignin. The aerial biomass of Hairy vetch presented the highest
concentrations of N in the dry matter (MS) produced. When the oats were fertilized
they were able to increase the contributions of N to the soil present in the
aerial biomass of the residue to 50%. The aerial biomass of Hairy vetch
presented the highest yields and concentrations of lignin. The different CC
presented C:N and LIG:N ratios that were based on the amount of MS produced by
the aerial biomass of the crop and its phonological state at the time of
drying. The temperature and
the moment of evaluation modified quantity and quality of the residues. The
parameters evaluated were sensitive to these changes.
Cover crops, cellulose, hemicellulose, lignin.
Sá Pereira E., J.A.
Galantini, A. Quiroga. 2017. Calidad de cultivos de cobertura en sistemas de
siembra directa del sudoeste bonaerense. Ciencia
del Suelo 35(2) 337-350
No comments:
Post a Comment