Distribution of organic matter fractions of an Oxisol under different integrated agricultural production systems.

Distribution of organic matter fractions of an Oxisol under different integrated agricultural production systems.

AUTHORS Juan López-Herrera, Augusto Rocha de Moraes Rego, Paulo Sergio Rabello de Oliveira, Eloisa Mattei, Antonio Saa-Requejo.

E-mail: juan.lz.herrera@upm.es, cassielcarlos@hotmail.com, rabelo.oliveira@hotmail.com, eloisa-mattei@hotmail.com, antonio.saa@upm.es

Abstract

The declining organic matter content (OM) in agricultural soils is due mainly to poor agricultural management as soil fertility is closely related to OM. This work studies the variation in the different fractions of the OM in 7 plots with different agronomic management following integrated agricultural production system (IAPS) with different type of management. Six plots presented two crops per year, one of oats grown in autumn-winter and then soybeans grown in spring-summer. Seed doses per hectare and the management of livestock grazing were different among them. The seventh plot had a natural resection of rye and forage turnip during the winter, with succession of soybeans in spring-summer. Two reference plots were selected with hay and native forest production. These IAPS were compared at two areas, haymaking area and native forest, classified as Oxisols.

In each plot, random samples were analyzed at three different soil horizons, between 0.00-0.05, 0.05-0.10 and 0.10-0.20 m. Based on the soil samples the following parameters were measured: Total Organic Carbon (TOC), Particulate Organic Carbon (POC) associated with sand fraction, carbon stock (TOCst), mineral-associated organic carbon (MOC) associated with silt and clay, and humic substances (Fulvic Acids FA, Humic Acids HA and humin HUM). The relationship between these seven carbon indices and the seven IAPS were statistically analyzed using Tocher's multivariate non-hierarchical grouping methods.

The results pointed out that the different fractions of MO minus AH have a positive correlation in the three layers studied compared to the native forest. Therefore, IAPS management strategies promote beneficial modifications to soil properties and are beneficial for soil preservation. The management systems studied can serve as options for producers who wish to replace exclusive hay production with integration between crops and livestock in an Oxisol area similar to this one. Finally, the adoption of these management systems can lead to better soil preservation and increased economic benefits.

 

Keywords: integrated crop-livestock system, soil management, fractions of soil organic matter.

 

Reference

REGO, C. A. R. M.; OLIVEIRA, P. S. R.; PIANO, J. T.; ROSSET, J.S.; EGEWARTH, J. F.; MATTEI, E.; SAMPAIO, M. C.; LOPEZ-HERRERA, J.; GONÇALVES JUNIOR, A. C. (2020). Chemical properties and physical fractions of organic matter in oxisols under integrated agricultural production systems. Revista de Agricultura. Neotropical, Cassilândia-MS, v. 7, n. 3, p. 81-89, jul./set. 2020. ISSN 2358-6303.

 

REGO, C. A. R. M.; OLIVEIRA, P. S. R.; PIANO, J. T.; EGEWARTH, J. F.; EGEWARTH, V. A.; LOPEZ-HERRERA, J. (2020). Organic Matter Fractions and Carbon Management Index in Oxisol Under Integrated Agricultural Production Systems. Journal of Agricultural Studies, 2020, Vol. 8, No. 3 ISSN 2166-0379 https://doi.org/10.5296/jas.v8i3.16325