Abstract
The cover crops
(CC) is a good alternative to improve the lack of coverage and carbon balance
in soils under no tillage with soybean (Glycine
max L. Merr.) monoculture, predominant in the Pampean Region. In this study
(2006-2011) the effect of winter cover crops -wheat (T), oats (A), vetch (V)
and oats+vetch (A+V)- on water consumption, dry matter production and its
impact on the of soil organic carbon contents (TOC) was evaluated. Biomass
production of the CC was closely related to rainfall recorded between the
months of June and October. In general, T and A treatments contributed greater
amount of soil cover, on average, these grasses biomass were 24 and 91% higher
compared with A+V and V. The water cost of including CC was 13-93 mm compared
to traditional fallow (Ct). At the time of sowing of soybean, in general, Ct
presented the highest water content. However, this treatment showed a loss of
moisture by evaporation without biomass production, which is used by the CC to
fix carbon between 18 and 303 kg C ha-1 depending on the year
conditions. The use of CC -T, A and A+V- increased the TOC at 0-20 cm depth at
rates of 597 to 98 kg C ha-1yr-1, while it decreased at
824 and 289 kg C ha-1 yr-1 without CC or using legumes
(V), respectively. For conservation or increase the TOC, use of CC such as A,
A+V and T would be a feasible option given that exceeds the minimum source C
input of4,5 Mg C ha-1 necessary to maintain the TOC in soils south of Santa Fe.
Key words: Argiudoll; winter cover crops;
available water; organic carbon
Duval M.E.,
J.E. Capurro, J.A. Galantini, J.M. Andriani. 2015. Utilización de cultivos de
cobertura en monocultivo de soja: Efectos sobre el balance de carbono. Ciencia del Suelo 32 (2) 247-261.
No comments:
Post a Comment