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agencies agricultural lands Alfisol bulk density Central Plains Chaguaramas clods conservaci6n de suelos conservation agreement conservation tillage controlling soil conventional tillage CPGS crop residues crusting curso-II Taller degradation DICET effects environment environmental farm-plan farmers farming system fertilizer goals Gondelles guidelines Halcrow implementation important incentives institutional loam LSWCA maize Maracay MARNR Mg ha"1 Ministry mulch National Research Council no-tillage nutrient Paez percent phosphorus Plains of Guarico porosity protection R6mulo Gallegos raindrop impact rainfall region reported root growth runoff runoff water Sierra Club sistema de labranza soil aggregates soil and water soil compaction soil conservation programs soil erosion soil loss soil management soil moisture soil physical soil quality Soil Sci soil strength soil structure soil surface soil surveys Soils Department splash erosion Steiner subsoiling SWCLA Taller sobre sistema tillage methods tropical Venezuela Voorhees water conservation policies water conservation programs watershed