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acid gas acre amount animals atoms bacteria body breeds butter butter fat called capillary capillary action carbonic acid carbonic acid gas cattle cell cent clods clover contains cotton cows crop cultivator dairy decay disease eggs Farm Management farmer feed fertilizers flowers food materials fruit fungi glass grass green manure grow grown growth hogs horses humus inches income insects irrigation keep kinds of plants labor land layer leaves legumes less lime limestone livestock loam manure milk mineral molecule muck soil mycelium nitrate nitrogen Office of Farm organic matter ovule oxygen pistil plant food plowing pollen potatoes pounds produce profitable purebred quantities quicklime rain rainfall regions rock particles root hairs rootstocks sandy soil scion shown in Figure slaked lime soil grains soil water soluble spores stems substances surface tile tillage U. S. D. A. Fig usually vegetable matter weeds wheat