01662nam a2200253 a 450000100080000000500110000800800410001910000210006024501690008126001020025052008120035265000290116465000240119365000130121765000100123065000190124065000180125965300270127770000190130470000230132370000190134670000280136570000150139321080352019-04-09       2001    bl uuuu     u00u1 u    #d1 aMANTOVANI, E. C.  aEffects of chemical and physical soil properties spatial variability analysis on two-years no-tillage system corn productivity map in Brazil.h[electronic resource]  aIn: ASAE ANNUAL INTERNATIONAL MEETING, 2001, Sacramento. Technical paper... St.Joseph: ASAEc2001  aThe field data showed on this 1st year (1999/2000) great differences on com productivity, from 3.2 to 10.6 t/ha, on the same experimental area, of 38 ha under a central pivot irrigation system. Soils maps of chemical (plí, OM, P, K) and physical aspects were made in order to e"..plain these variability's. Comparing the soil chemical maps with com productivity mal' on this 1st year, the results indicate same pattem or similar distribution with' organic matter map. The physical properties maps are being processed now but they are showing a slight correlation of low com productivity area with soil compaction. On this second year (2000/2001), half of the experimental area was planted with soybean and half with com, trying to use similar situation no-tillage system ofthe Center-West region of Brazil.  aAgricultura de Precisão  aFertilidade do Solo  aFósforo  aMilho  aPlantio Direto  aProdutividade  aVariabilidade espacial1 aFRANÇA, G. E.1 aOLIVEIRA, A. C. de1 aSVERZUT, C. B.1 aANDRADE, C. de L. T. de1 aSANTOS, W.