Productive farming . en a heavy application of fresh stablemanure to the field just before the potatoes are planted. Itis better to manure the field one year in advance if possible,or to use some well-rotted manure. 2. When lime is applied to the soil the disease will likelybe worse on the potato crop. Green manure plowed underin preparing the field for potatoes will help to counteractthis action of the lime. 3. Soils from which a very scabby crop of potatoes has DISEASES OF PLANTS—SPRAYING 231 been harvested recently will probably cause the next cropto be diseased in hke manner. Rotation of c
Productive farming . en a heavy application of fresh stablemanure to the field just before the potatoes are planted. Itis better to manure the field one year in advance if possible,or to use some well-rotted manure. 2. When lime is applied to the soil the disease will likelybe worse on the potato crop. Green manure plowed underin preparing the field for potatoes will help to counteractthis action of the lime. 3. Soils from which a very scabby crop of potatoes has DISEASES OF PLANTS—SPRAYING 231 been harvested recently will probably cause the next cropto be diseased in hke manner. Rotation of crops is, therefore,advisable. Do not use beets and other root crops in thisrotation, as the scab disease also attacks them. 4. Seed potatoes are usually more or less scabby or havethe germs of the disease upon them. If these are plantedwithout treatment the disease will Ukely be introduced intothe soil. The treatment of seed potatoes to prevent the planting ofscab disease is now a very cheap and simple process. The. Fig. 147.—Apple rust on leaf and twig, seed potatoes are soaked for two hours in a solution of forma-lin. This solution is made by mixing one pint of the strong-est formahn in thirty-two gallons of water. This kills thedisease germs but does no harm to the potatoes. The liquidmay be used for several sacks of potatoes. Exercise.—Showing Potato Scab.—Specimens of Irishpotatoes haying the scab disease should be brought to schooland shown to all the students. Grain Smut.—In fields of grain, when it is in head, maybe often seen a black powder which clings to the husks ofthe grain (Fig. 148). This black powder is the fruit of adisease growing inside of the grain stalks. The disease is 23^2 PRODUCTIVE FARMING called grain smut, for it causes the black appearance, like stove soot, on the heads of grain. Oats and barley are often very badly injured by this disease. Any farmer can prevent his grain from having the disease by a very simple and cheap process. The seed
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu, booksubjectagriculture
