Productive Soils: The Fundamentals of Successful Soil Management and Profitable Crop Production

acid phosphate acid soils agricultural lime alfalfa amount applied average bacteria barley bushels cabbage calcium capillary water carbonate of lime cent Chapter chemical clover commercial fertilizers commonly contain corn cowpeas crocks crop rotation cultivation deep determine disk drainage drained erosion factors farmer farming favorable feeding fertilizing elements field furrows germination grain grass green manuring growing grown growth humid important inches increase inoculation irrigation legumes limestone litmus paper material mineral elements mixed moisture muck soils mulch muriate of potash nitrate nitrification nitrogen nodule oats organic matter pasture peas peat peat and muck phos phosphorus plant-food elements plants plowed potassium potatoes production profitable rainfall rock phosphate roots salts sand seed bed silt loam soil fertility soil mulch soil organisms soil particles soybeans subsoil sugar beets supply surface texture tile tile drainage tillage tilth timothy tons usually weeds winter wheat yield