Fertilizers the Source Character And Composition of Natural Home Made And Man
Fertilizers the Source Character And Composition of Natural Home Made And Man
Edward Burnett Voorhees
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Thus no unknown conditions of availability are involved, and when the nitrogen is so applied, the danger of loss by leaching, which would exist if it were all applied at one time, is obviated. This method also possesses many advantages, particu- larly where the " intensive " system is practiced, though it is also useful in quickly building up wornout soils, or those naturally poor, because in any case these must be provided with liberal supplies of the minerals, and when these only are applied,... the immediate outlay is far less Methods of Use of Fertilizers 207 than if the expensive element, nitrogen, were included ; and a greater economy in the use of nitrogen is accomplished if it is added in small amounts when required. Besides, in the improvement of soils, the liberal application of the min- erals is conducive to an abundant growth of the legumes, which are able to acquire their nitrogen from the air, thus reducing to some extent the outlay for this expensive ele- ment. This system is strongly recommended where cheap phosphatic and potassic materials are readily accessible, as is the case in those countries where it is successfully used.
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