. Advanced biology. Biology; Physiology; Reproduction. 410 BENEFICIAL ACTIVITIES OF BACTERIA tato blight will not affect wheat. Rotation of crops also kills insect pests that live only on a certain plant. (3) The un- gathered roots and stalks of crops remain in the ground, decay, and produce organic acids. These acids are sometimes injurious to the plant producing them, but not to other plants. Hence, the crops should be changed. Bone meal or lime is added to neutralize these acids. Each commercial fertilizer used, how- ever, adds that much to the farmer's expense. (4) Almost all crops remove
. Advanced biology. Biology; Physiology; Reproduction. 410 BENEFICIAL ACTIVITIES OF BACTERIA tato blight will not affect wheat. Rotation of crops also kills insect pests that live only on a certain plant. (3) The un- gathered roots and stalks of crops remain in the ground, decay, and produce organic acids. These acids are sometimes injurious to the plant producing them, but not to other plants. Hence, the crops should be changed. Bone meal or lime is added to neutralize these acids. Each commercial fertilizer used, how- ever, adds that much to the farmer's expense. (4) Almost all crops remove great quantities of nitrates from the soil. These may. /bacteria A number of different bacteria aid in transforming nitrogen into a form which plants, can use. There is a constant renewal of nitrogen in the soil. be restored in a variety of ways. Animal waste, manure, may be spread over soil and allowed to decay. This increases the nitrogen. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wheat, Frank Merrill; Fitzpatrick, Elizabeth T. New York ; Boston [etc. ] : American Book Company
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