A soil surface traffic - corn yield model for a soil under cerrado vegetation in Brazil with less than 10 years of cultivation.
1984
MANTOVANI, E. C. | EVANDRO CHARTUNI MANTOVANI, CNPMS.
Due to the rapid expandion of the brazilian agriculture frontier and adoption of mechanization technology, the "cerrados" area has begun to show some signs of mismanagement. One area of mismanagement is the mechanization process especially how it affects soil compaction. This study was conducted at the National Research Center for Corn and Sorghum EMBRAPA, Sete Lagoas, Minas Gerais, Brazil, 1983, with the objective to quantify the effect of surface traffic on corn yield in soil with less than 10 years of cultivation and also to model the effect of traffic on Dark Red Latosol soil. Five compaction levels (0, 1, 5, 10, 10 + subsoiler) and two irrigation levels in a split plot design were tested. The soil's critical moisture content range was 32-35% and was obtained by the Standard and 15-Blow Proctor. A Ford-6000 tractor carrying a disk harrow in an up position with 4900 kg weight was used as static force and its front and rear contact pressure was 0.70 and 0.78 kg/cm2. A soil characterization of the plotas was performed before and after soil compaction at 0-7.5, 7.5-15, 15-22.5, 22.5-30, 30-37.5 and 37.5-45 cm depth and the parameters studied were: bulk density, particle density, pore size distribution, particle size distribution, aggregate stability and soil stresgth. Also plant growth, soil moisture content, root weight and grain yeild were evaluated under the tested compaction levels. A stepwise regression program was used and the best set of independent variable was found to establish a regression (...)
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