. Botany for agricultural students. Plants. 92 GERMINATION OF SEEDS: SEEDLINGS Oxygen Requirement. — Although seeds are in the optimum temperature and properly supplied with moisture, they will usu- ally not germinate unless oxygen is supplied, as is often demon- strated in the laboratory by the use of some substance to absorb the oxygen in the germinator or by replacing the air in the ger- minator with hydrogen, nitrogen, or some other substance, so that oxygen is excluded. (Fig. 91.) However, since the air is about one-fifth oxygen, seeds receive enough oxygen to germinate well if only air i
. Botany for agricultural students. Plants. 92 GERMINATION OF SEEDS: SEEDLINGS Oxygen Requirement. — Although seeds are in the optimum temperature and properly supplied with moisture, they will usu- ally not germinate unless oxygen is supplied, as is often demon- strated in the laboratory by the use of some substance to absorb the oxygen in the germinator or by replacing the air in the ger- minator with hydrogen, nitrogen, or some other substance, so that oxygen is excluded. (Fig. 91.) However, since the air is about one-fifth oxygen, seeds receive enough oxygen to germinate well if only air is supplied, although germination is often hastened. W i -s- -. 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 Martin, John N. (John Nathan), b. 1875. New York, John Wiley ; London, Chapman & Hall
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
