Fracionamento físico da matéria orgânica do solo após consórcios de segunda safra no ecótono Cerrado-Amazônia

Abstract

In order to solve the challenges resulting from crop succession, some conservationist practices have been implemented, including the no-tillage system and intercropping of main crops with cover crops. These measures aim to reverse the problems caused by crop succession, promoting soil conservation and improving its properties. The objective of this work was to evaluate the physical fractionation of soil organic matter, the carbon stocks and waste in the soil, as well as the carbon and total waste of different combinations of cover crops, in a Cerrado-Amazon transition region. . For this, an experiment was carried out at Embrapa Agrossilvipastoril, Sinop-MT. A soil sample was collected at a depth of 0 to 20 cm during the 2019/2020 season, from five pseudo-replications per treatment, eight treatments with different combinations of cover crops. The treatments used were: soybean cultivation followed by cotton (Algodão); and soybean followed by the following consortiums: Urochloa brizantha CV. Paiaguas + Cajanus cajan (Super N), Urochloa brizantha CV. Piatan + Vigna unguiculata (Cowpea); Urochloa brizantha CV. Paiaguás + Helianthus annuus (Sunflower); Urochloa ruziziensis + Crotalaria Ochroleuca (C. Ochroleuca), Urochloa ruziziensis + Crotalaria spectabilis (C. Spectabilis), Urochloa brizantha CV. Paiaguas + Raphanus Sativus L. (Turnip) and Eleusine coracana + Cajanus Cajan + Crotalaria Ochroleuca + Guizotia abyssinica + Raphanus Sativus L. + Urochloa ruziziensis (Sextuple). Total organic carbon, particulate organic carbon, mineral-associated carbon, total disease, as well as the relationships between carbon and disease were passed. The use of consortia with many cover crops in the Amazon biome promotes greater carbon stocks and diseases, and the use of cover crops promotes better soil physical quality. Keywords: Amazon biome, carbon, nitrogen, su