. Cyclopedia of farm crops. Farm produce; Agriculture. 48 THE MEANS OF CONTROLLING PLANT DISEASES ease, especially those which find permanence in the soil, that may be controlled to a large degree through proper culture, rotation of crops, soil resting, and soil weathering. In certain types of troubles, chemical applications have been found to. Fig. 72. Showing difference in growth of wheat from rusted and unrusted mother plants of the same crop (alternating). Seeds phiuted same day and plants same age. be efficacious. All such methods and treatments de- pend for their basis on the nature of t
. Cyclopedia of farm crops. Farm produce; Agriculture. 48 THE MEANS OF CONTROLLING PLANT DISEASES ease, especially those which find permanence in the soil, that may be controlled to a large degree through proper culture, rotation of crops, soil resting, and soil weathering. In certain types of troubles, chemical applications have been found to. Fig. 72. Showing difference in growth of wheat from rusted and unrusted mother plants of the same crop (alternating). Seeds phiuted same day and plants same age. be efficacious. All such methods and treatments de- pend for their basis on the nature of the particular disease-producing organism. Proper crop rotation rests the land, keeps up an equable plant-food ration, and lessens the possibility of disease accumulation, because each plant disease is special in its wants and cannot increase in the absence of its host. Soil disinfection by means of chemical substances directly applied does not yet give great promise. The disease - producers are usually possessed of greater powers of resistance than the delicate roots of cultivated plants. Careful study of the soil constituents and physical condition often allows of soil treatment that is beneficial in reducing the efi'ects of disease. Some diseases, such as potato- scab and flax-wilt, caused by soil fungi, are found to develop with much greater damage on markedly alkaline soils than on soils of neutrality. This is comparatively easy of correction through the use of barnyard manures, the growth of grasses, and the like. Soils of poor texture often result in such weak growths that ordinary infectious diseases become more destructive than under proper tillage. Such features must be remedied by proper methods of handling the soil preparatory to cropping. To this end, plowing and cultivating at the proper time aerate the soil, allow it to weather and become a large factor in destroying germs of disease that hold over in the soil from year to year. This, we are rapidly learning, is o
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