Atributos bioquímicos de um argissolo amarelo cultivado com adubos verde e de um latossolo húmico após aplicação de calcário

Abstract

The aim of this study was to evaluate the biochemical changes occurring in an Ultisol planted with green manure and an Oxisol Humic after liming. In the experiment with green manure was used randomized complete blocks with plot scheme on track with 5 treatments (Crotalaria; Soybean perennial; Guandu dwarf; Calopogonio and spontaneous vegetation) and 4 replications. We performed the chemical, biochemical and biological attributes, identification and quantification of organic acids in soil after application of the treatments. The dwarf pea had the highest dry matter production and green, higher accumulation of N, P, K and C. The perennial soybean showed higher levels of P and K. The sunnhemp higher concentrations of N, and dwarf pea higher C content in its dry mass. Green manures had lower C / N ratio The microbial biomass carbon showed higher value in the treatment dwarf pigeonpea (578.12 mg kg CBM-C-1). The microbial respiration was influenced by the use of perennial legume sunn hemp and soy. The highest levels of total organic carbon were observed in treatments with perennial soybean, calopo and crude. The treatment showed the highest content of water-soluble carbon was the dwarf pigeonpea (109.34 mg kg-C 1solo dry). The use of legumes promoted the increased enzyme activity in the soil. Treatment with pigeonpea contributes to higher levels of free light fraction organic matter. Treatment with calopo was what had higher C content in fraction F4, corresponding to 34% of TOC. BMI was higher in the soil with cultivation of pigeonpea dwarf, demonstrating that this legume plant residue promoted the maintenance of carbon stocks. In all treatments was observed only the presence of acetic acid, with the highest concentration in the soil after cultivation of perennial soybean. In the experiment with dystrophic experimental design used was completely randomized block in a 2x5 factorial arrangement with four replications, with the first factor represented by the SC treatments (without liming) and CC (with lime application), and the second factor 5 evaluation periods (7, 14, 30, 45 and 60 days). The liming treatments CC was 3.35 t ha-1. We performed the chemical, biological attributes, identification and quantification of organic acids in soil after application of the treatments. Liming increased soil pH and calcium, in addition to reducing the potential acidity of the soil. The phosphorus content was higher 30 days after the application of limestone (3.50 mg kg-1). The highest levels of sodium were observed within 60 days in treatments with and without liming. The higher nitrogen content was obtained 45 days after lime application. The content of the microbial biomass was higher at 7 days in the ground where there was liming with 383.68 mg C kg-CBM-1. The largest amount of total organic carbon was observed at 14 days in water without liming. The higher respiratory activity was observed in the soil where no lime application in periods of 30 and 60 days. For treatments with lime application, detected the presence of acetic acid in all periods, with a period of 30 days at the highest concentration, with 16.21 mg kg-1. Only in the period of 7 days in the treatment without lime application was observed the presence of acetic acid.