Abstract

AMORIM-SILVA DO SACRAMENTO, José Augusto et al. Effect of agricultural correctives in the stocks of carbon and nitrogen of Oxisol in the brazilian amazon. Acta Agron. [online]. 2019, vol.68, n.4, pp.265-270. ISSN 0120-2812.  https://doi.org/10.15446/acag.v68n4.78564.

In a clay-colored dystrophic Oxisol from the experimental field of the Brazilian Agricultural Production Company (EMBRAPA) in the city of Belterra, State of Para, the effect of the agricultural corrective measures (cal dolomitay and gypsum) on the carbon and nitrogen reserves was evaluated. ground. The soil samples were taken in small pits of 0.60 x 0.60 x 0.60 in three replications and a random block design with three replications and five treatments (lime / gypsum -kg / ha) in agricultural systems under direct seeding (SSD): Treatment 1 (C0G0) = no lime / no gypsum, Treatment 2 (C1G1) = 1000/500), Treatment 3 (C4G2) = 4000/1000), Treatment 4 (C4G2) = (4000/1000) plus a witness in forest Native (BNA) without amendments. The soil samples were taken every 10 cm up to 60 cm deep. The results showed that the application of gypsum and lime in the direct seeding system of commercial crops increases the availability of nutrients in the upper layers of the soil up to 20 cm deep. The best results in the soil profile were obtained with the C4G2 treatment.

Keywords : No tillage; native forest; physical and chemical characteristics.

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