Fundamentals of Botany
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Thus it is seen that bacteria are essential to one of the oldest and most fundamental practices of agriculture.
298. Nitrogen-fixing Bacteria in Soil.-^In addition to the symbionts causing leguminous tubercles, there exist, in all soil, at least two other forms of nitrogen- fixing bacteria, which grow independently of other plants. The first, by the addition of oxygen, transforms the ammonia in the soil into nitrites, while the second, by the addition of more oxygen, transform nitrites into nit...rates.^ It is only in the latter form that nitrogen, so indispensible to nutrition, can be utilized at all by plants.
299. The Nitrogen Cycle.— From the above facts it is seen that there is, in nature, a nitrogen cycle quite as 1 The subject of rotation of crops is more fully discussed in para- graph 90 (pp. 91-93).
2 Cf. Chapter VII, pp. 82-83.
ECONOMIC IMPORTANCE OF FUNGI 319 remarkable as the carbon cycle. By respiration and burning, complex compounds of carbon (carbohydrates and hydrocarbons) are broken down and the carbon re- leased, either as pure carbon (C) or as the simple com- pound, carbon dioxide (CO2), which is taken in by green plants and recombined into the complex carbohydrates by the process of photosynthesis (page 77).
What to read after Fundamentals of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Gager, C. Stuart (Charles Stuart), 1872-1943 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Thus it is seen that bacteria are essential to one of the oldest and most fundamental practices of agriculture.
298. Nitrogen-fixing Bacteria in Soil.-^In addition to the symbionts causing leguminous tubercles, there exist, in all soil, at least two other forms of nitrogen- fixing bacteria, which grow independently of other plants. The first, by the addition of oxygen, transforms the ammonia in the soil into nitrites, while the second, by the addition of more oxygen, transform nitrites into nit...rates.^ It is only in the latter form that nitrogen, so indispensible to nutrition, can be utilized at all by plants.
299. The Nitrogen Cycle.— From the above facts it is seen that there is, in nature, a nitrogen cycle quite as 1 The subject of rotation of crops is more fully discussed in para- graph 90 (pp. 91-93).
2 Cf. Chapter VII, pp. 82-83.
ECONOMIC IMPORTANCE OF FUNGI 319 remarkable as the carbon cycle. By respiration and burning, complex compounds of carbon (carbohydrates and hydrocarbons) are broken down and the carbon re- leased, either as pure carbon (C) or as the simple com- pound, carbon dioxide (CO2), which is taken in by green plants and recombined into the complex carbohydrates by the process of photosynthesis (page 77).
What to read after Fundamentals of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Gager, C. Stuart (Charles Stuart), 1872-1943 to read onlineMoreLess
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