Biology of soil science by Charlotte Jhonson

By Charlotte Jhonson

«Biology of Soil technological know-how» is a vital department of agriculture which offers with stories of other components like soil physics soil chemistry soil fertility and plant meals soil survey, genesis and category, soil mineralogy, and so forth. it truly is, accordingly, crucial that this important ordinary source is known and conserved competently for sustained agricultural construction in India. nationwide agricultural creation is principally established upon one of many vital ordinary source like «soil».

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The new warp is allowed to lie fallow during the winter after being laid out in fouryard "lands" and becomes dry enough to be sown with oats and grass and clover seeds in the following spring. The clovergrass ley is then grazed for a year or two with sheep, after which wheat and potatoes are the chief crops grown on the land. Green manures are crops which are grown especially for the purpose of ploughing into the land in a green or actively growing state. The crop during its growth obtains a considerable amount of Green carbon from the carbon dioxide of the air, and builds it up Manuring into compounds which when ploughed into the land become humus.

An analysis of the innumerable outbreaks in various parts of Europe indicates that the geological features of the affected districts playa less important part in the incidence of the disease than soil dampness. In this connexion it is interesting to note the behaviour of the diphtheritic contagion in soil. Experiments show that pure cultures, when mixed with Introduction 33 garden soil constantly moistened short of saturation and kept in the dark at a temperature of 14°C, will retain their vitality for more than ten months; from moist soil kept at 26°C they die out in about two months; from moist soil at 30°e.

Soil acids, produced by these microorganisms and by OM decomposition, release 42 Microbiological Studies of Soil phosphates. Phosphorus availability is therefore dependent on the maintenance of high levels of biological activity and stable humus in soil. Under these conditions, phosphorus is continually recycled through the processes of OM decay. Some plants produce acidity around their roots which assists in the uptake of P; examples of these are legumes actively fixing nitrogen, rapeseed, oilradish and buckwheat.

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