. Advanced biology. Biology; Physiology; Reproduction. entrance of air. Lime is sometimes added to soil to neutralize its acidity so that the nitrifying activities may be increased. Denitrification, If soil is poorly drained, poorly aerated, and contains fresh organic matter, denitrifying bacteria thrive. They convert the ammonia, formed in the decay process, into free nitrogen. The free nitrogen ?""^lilL^'e'dtrg^^sms!'" then escapes into the air and is lost to the plants. The denitrifying bacteria can also break down nitrates into nitrites, then into ammo- nia, and finally into
. Advanced biology. Biology; Physiology; Reproduction. entrance of air. Lime is sometimes added to soil to neutralize its acidity so that the nitrifying activities may be increased. Denitrification, If soil is poorly drained, poorly aerated, and contains fresh organic matter, denitrifying bacteria thrive. They convert the ammonia, formed in the decay process, into free nitrogen. The free nitrogen ?""^lilL^'e'dtrg^^sms!'" then escapes into the air and is lost to the plants. The denitrifying bacteria can also break down nitrates into nitrites, then into ammo- nia, and finally into free nitrogen. Soil should not be covered thicklv with unrotted manure as the activity of these bac- teria are then promoted. From the point of view of conserving soil fertility, the denitrifying bacteria are undesirable. Certain other bacteria are able, how^ever, to take free nitrogen from the air and again change it into a form in which it can be used. These are called the nitrogen-fixing bac- teria. Nitrogen-fixation. The ^ nitrogen-fixing bacteria Nitrogen-fixing bacteria form nodules or small swellings , l j u A' on the roots of pod-bearing plants. The countless bac- liave already DCen (lis- teria in these nodules fix free nitrogen of the air into a i • usable form, nitrates. CUSScd in the prcVlOUS. 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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Keywords: ., bookcentury1900, bookdecade1920, booksubje, booksubjectphysiology
