01913nam a2200361 a 450000100080000000500110000800800410001902000180006010000180007824500550009626000300015130000150018149000360019652010610023265000090129365000190130265000100132165000100133165000120134165000150135365000200136865000180138865000110140665000120141765300120142965300140144165300170145565300150147265300150148765300160150270000150151870000180153311471992015-08-04       1997    bl uuuu      00u1 u    #d  a92-9066-359-61 aLARYEA, K. B.  aMeasuring soil processes in agricultural research.  aPatancheru: ICRISATc1997  a99 p.cil.  a(ICRISAT. Technical Manual, 3).  aSoil and crop management strategies (e.g., tillage, bunding, cropping intensity, and crop sequencing) are location- and season-specific in the way they affect soil processes and resource utilization by crops. Research findings on these effects therefore need to be modeled if they are to be extrapolated to other locations with similar soils and climatic conditions. This manual presents practical methods for assessing management effects on such soil processes as water infiltration and erosion by water, and on water, air, and nutrient use by crops. It covers the basic elements of soil physical characterization, and deals principally with the role of soil structure on water infiltration and percolation, heat flow, aeration, and the mobility of roots and the mobility of roots and soil microorganisms. The authors discuss the agronomic and engineering practices that affect soil processes; and the effects of such strategies as contour cultivation, organic and inorganic amendments, watershed menagement, and soil surface manipulations are emphasized.  asoil  asoil structure  awater  aÁgua  aErosão  aEscoamento  aFísica do Solo  aInfiltração  aManejo  aUmidade  aErosion  aEstrutura  aInfiltration  aManagement  aPercolacao  aPercolation1 aPATHAK, P.1 aKATYAL, J. C.