The new encyclopædia Britannica: in 30 volumes |
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Page 1018
... soil micro - or- ganisms contribute much greater quantities of nitrogen . Organic matter bound in the tissues of soil animals is perhaps as much as a ton per acre , expressed as fresh weight . This is a reservoir of nutrients that is ...
... soil micro - or- ganisms contribute much greater quantities of nitrogen . Organic matter bound in the tissues of soil animals is perhaps as much as a ton per acre , expressed as fresh weight . This is a reservoir of nutrients that is ...
Page 1023
in 30 volumes. Variation in humus The poly- genesis of soils Precise definition of soil properties Figure 6 : Fundamental characteristics. O metres 0.25- depth 0.50- 0.75 O feet 2 natric solonetz ( natrargid ) Ah Ae Bt E G poor drainage ...
in 30 volumes. Variation in humus The poly- genesis of soils Precise definition of soil properties Figure 6 : Fundamental characteristics. O metres 0.25- depth 0.50- 0.75 O feet 2 natric solonetz ( natrargid ) Ah Ae Bt E G poor drainage ...
Page 1024
... soils with clays that came from the centre of Brazil , and many soils of northern India have 2 : 1 clays that have been formed in the Himalayas . The frequent variation in conditions during soil forma- tion , resulting in polygenetic soils ...
... soils with clays that came from the centre of Brazil , and many soils of northern India have 2 : 1 clays that have been formed in the Himalayas . The frequent variation in conditions during soil forma- tion , resulting in polygenetic soils ...
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