Soils and fertilizers . ioo aoo TZoO TbSd aioo POONDS OF FLOATS ^fiPUCO PER y^CR£. ?MO aoo aoo /600 sooo POUriDS OF FLOATS APPLIED F^R ACRE. Fig. 32. — In the upper diagram the heavy line shows how the yields ofcom were increased by graduated applications of phosphoric acid in will be seen that the increases in yields were proportionately much greaterfor small applications than for large. The lower diagram illustrates the rate at which the cost of the fertilizerapproaches and finally passes the value of the product as the size of the appli-cation increases. on the presence or absence

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Soils and fertilizers . ioo aoo TZoO TbSd aioo POONDS OF FLOATS ^fiPUCO PER y^CR£. ?MO aoo aoo /600 sooo POUriDS OF FLOATS APPLIED F^R ACRE. Fig. 32. — In the upper diagram the heavy line shows how the yields ofcom were increased by graduated applications of phosphoric acid in will be seen that the increases in yields were proportionately much greaterfor small applications than for large. The lower diagram illustrates the rate at which the cost of the fertilizerapproaches and finally passes the value of the product as the size of the appli-cation increases. on the presence or absence of certain conditions. The entireamount of any constituent of a f ertiUzer is never recovered by acrop in any one year. This is a very important considerationin the manuring of land, for under conditions as they fre-quently exist, the use of fertilizers is wasteful and extravagant. 218 SOILS AND FERTILIZERS The factors, within the control of man, that affect theavailability of fertilizers are the following: (1) the kind ofcrops; (2) soil moisture content; (3) soil acidity;

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Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectfertilizers