Publication Date: 2018.
In the Southeastern region of Buenos Aires province, soybean monoculture has led to a decline in soil organic matter (SOM) levels in soil, mostly the labile fractions. The reduction of SOM has a negative impact on the soil environment. Cover crops (CC) constitute an alternative to maintain or improve SOM levels. The aim of this study was to determine the effect of oat as CC on (a) the SOM dynamics and (b) the availability of macro- and micronutrients in a representative soil of the Southeastern region of Buenos Aires province. Total organic carbon (TOC) and nitrogen (TON), as well as their labile and mineral-associated fractions, and macro- and micronutrient availability were determined. The treatments were soybean monoculture with and without oat as cover crop. The increases in SOC and TON were 22.7% and 11%, respectively, when CC was included to the soybean monoculture. These increases were observed mostly in the labile fractions, with increases of 61.3 and 38.7% for the particulate coarse organic carbon (PCOf) and particulate fine organic carbon (PCOf), respectively, and 79.2% for the particulate coarse organic nitrogen (NOPg). Regarding the nutrients, an increase of 47.6% was observed in manganese (Mn) in the first 5 cm of soil depth, and a decrease in phosphorous (P) availability in the same soil layer due to its consumption and retention by CC. It can be conclude that CC presented a surface soil effect on the dynamic of SOM, increasing C, N, and available Mn contents, but decreasing soil P availability.
Instituto de Suelos
Author affiliation: Beltran, Marcelo Javier. INTA. Instituto de Suelos; Argentina
Author affiliation: Sainz Rozas, Hernan Rene. INTA. Estación Experimental Agropecuaria Balcarce; Argentina
Author affiliation: Galantini, Juan Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina
Author affiliation: Romaniuk, Romina Ingrid. INTA. Instituto de Suelos; Argentina
Author affiliation: Barbieri, Pablo. INTA. Estación Experimental Agropecuaria Balcarce; Argentina
Keywords: Plantas de Cobertura; Materia Orgánica del Suelo; Disponibilidad de Nutrientes; Avenas; Soja; Monocultivo; Compuesto Orgánico del Nitrógeno; Carbono Orgánico del Suelo; Cover Plants; Soil Organic Matter; Nutrient Availability; Oats; Soybeans; Monoculture; Organic Nitrogen Compounds; Soil Organic Carbon; Buenos Aires.
Repository: INTA Digital (INTA). Instituto Nacional de Tecnología Agropecuaria