. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. THE PLANT: ITS STRUCTURE, LIFE - PROCESSES AND ENVIRONMENT 11 the place. Some societies seem to be largely accidental in population, however, and others seem to be governed by definite laws or relationships. These laws of adaptation are very little understood. It is now suspected that there may be positive physiological incompatibility between some kinds, and toler- ance, conge
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. THE PLANT: ITS STRUCTURE, LIFE - PROCESSES AND ENVIRONMENT 11 the place. Some societies seem to be largely accidental in population, however, and others seem to be governed by definite laws or relationships. These laws of adaptation are very little understood. It is now suspected that there may be positive physiological incompatibility between some kinds, and toler- ance, congeniality or even symbiotic relationships between others. Under some kinds of , for exam- ple, certain kinds of herbaceous plants may thrive and others may perish, even when both are equally exposed to sunlight: it is doubtful whether this difference is to be explained by competition for food or moisture. We do not know why some weeds thrive in a corn-field and others do not. There may be bacterial or other organic relations between some kinds. There may be root-excretions that are hurt- ful to some plants and harmless or even useful to others. Perhaps the crop rotations that experience has found to be useful are dependent in some measure on such vital relationships as these. THE PLANT: ITS STRUCTURE, LIFE-PRO- CESSES AND ENVIRONMENT By W. J. V. Osterhout Plants resemble animals in their fundamental life-processes and in their essential requirements of food, air, water, warmth and light. But the green plants possess an important advantage over animals since they are able to manufacture food from air and soil-water. This process depends on the action of chlorophyll (leaf-green) in the sun- light, by the absorption of which the necessary energy is supplied. Other differences between animals and plants, as that plants take up food in dissolved form only and have cellulose walls, are of minor importance. The cell: protoplasm. Plants are composed of cells of microscopic size, th
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