02062nam a2200265 a 450000100080000000500110000800800410001910000220006024501510008226001660023352011560039965000210155565000220157665000160159865000240161465000190163865000110165765300180166865300200168665300100170670000150171670000180173170000230174970000240177220468432017-03-24       2016    bl uuuu     u00u1 u    #d1 aPEREIRA FILHO, A.  aNitrate in soil solution with use of plant cocktails as green manure in diferent tillage systems in the brazilian semi-aridh[electronic resource]  aIn: CONGRESO LATINOAMERICANO Y DEL CARIBE DE INGENIERÍA AGRICOLA, 12., 2016, Bogotá. Proceedings... Bogotá: ALIA: ASIAC: Universidad Nacional de Colobiac2016  aTillage systems strongly affect nutrient transformations and plant availability. The objective of this study was to assess the nitrate dynamic in soil solution in different tillage systems with use of plant cocktail as green manure in fertilized melon (Cucumis melon) in Brazilian semi-arid. The treatments were arranged in four blocks in a split-plot design and included three types of cover crops and two tillage systems, conventional tillage (CT) and no-till (NT). The data showed no strong effect of plant cocktails composition on NO3-N dynamic in the soil. Mean concentration of NO3-N ranged from 19.45 mg L-1 at 15 cm to 60.16 mg L-1 at 50 cm soil depth, indicating high leachability. No significant differences were observed between NT and CT treatments for 15 cm depth. The high soil moisture content at ~ 30 cm depth concentrated high NO3-N in all treatments, mean of 54.27 mg L-1 to NT and 54.62 mg L-1 to CT. The highest NO3-N concentration was observed at 50 cm depth in TC (60.16 mg L-1). High concentration of NO3-N in CT may be attributed to increase in decomposition of soil organic matter and crop residues incorporated into the soil.  aAdubação verde  aCobertura do Solo  aFertilidade  aFertilidade do Solo  aManejo do Solo  aMelão  aCucumis melon  aMacronutrientes  aMelon1 aGIONGO, V.1 aSIMOES, W. L.1 aTEIXEIRA FILHO, J.1 aFIGUEIREDO NETO, A.