Qualidade do solo cultivado com algodoeiro em sistema plantio direto e convencional

Abstract

The objective of this study was to evaluate the quality of a Cerrado soil cultivated with cotton in no-tillage and conventional tillage systems. Was determined the bulk density, total porosity, macro and micro porosity, water infiltration into the soil and the contents of C and N. The study was conducted in long-term field experiment (9 years), with different management systems and cultures in a Rhodic Hapludox. The experimental design was a randomized block design with 6 treatments and 4 repetitions, divided as follows: [NT1, NT2 and NT3] no-tillage system with crop rotation (corn / cotton / soybean); [CT1] Conventional Tillage with annual rotation (soybean / cotton); [CT2] Conventional Tillage with biannual rotation (soybean / soybean / cotton) and [CT] Conventional Planting with cotton monoculture. An area of native cerrado vegetation was used as reference. Soil samples of soil were collected in the 0-5, 5-10, 10-20 and 20-30, 30-60 and 60-100 cm for determination of bulk density, total porosity, macro and microporosity, levels C, N in the laboratory. The infiltration assessments were made in the field with infiltrometer Mini Disk. The no-tillage system showed increased C content in the 0-5 cm layer. The bulk density, porosity, macro and microporosity did not differ between systems; water infiltration into the soil tends to be more influenced by this culture in the area at the time of evaluation, than the soil management system.