. Soils and fertilizers . e conditions enumerated above. 276. Response of sandy and of clay soils to fertilizers. —It is generally recognized that a sandy soil responds morepromptly to the application of fertilizers than does a claysoil. There are probably two reasons for this : (1) Absorp-tion may not be so complete both on account of the particlesbeing larger, and because in many sandy soils the particlesare largely composed of quartz, which does not have theproperty of forming combinations with bases, as does clay;(2) Drainage and aeration are likely to be better, as are mostof those condit
. Soils and fertilizers . e conditions enumerated above. 276. Response of sandy and of clay soils to fertilizers. —It is generally recognized that a sandy soil responds morepromptly to the application of fertilizers than does a claysoil. There are probably two reasons for this : (1) Absorp-tion may not be so complete both on account of the particlesbeing larger, and because in many sandy soils the particlesare largely composed of quartz, which does not have theproperty of forming combinations with bases, as does clay;(2) Drainage and aeration are likely to be better, as are mostof those conditions that make plant-food materials moreavailable. For these reasons, a sandy soil generally makesa greater response to fertilizers the first year, but shows lesseffect in subsequent years unless the treatment is the other hand, less fertilizing material is lost from a claysoil by leaching. 277. Cumulative need for fertilizers. — It is often re-marked that on land habitually fertilized there is a gradually. A sufficient supply of moisture makes a fertilizer more effective. Notethe greater response to fertilization in the vessels having more moisture. Vessel 45. Moisture 30 per cent, Vessel 49. Moisture 15 per cent, Vessel 58. Moisture 30 per cent, Vessel 64. Moisture 15 per cent, Vessel 69. Moisture 30 per cent. Vessel 78. Moisture 15 per cent, no fertilizer,no fertilizer,complete fertilizer,complete fertilizer,more fertilizer,more fertilizer. 1 1 « » 1 . h V , i _-4WilftiilI \ 1 _. AU / ! it r -JB-WJ lid >ji^^r iiilfi will Plate XIV — A soil may contain too much or too little moisture. Thebest crop is in the vessel having next to the largest quantity of water. Vessel 20. Moisture 11 per cent. Vessel 26. Vessel 22. Moisture 13 per cent. Vessel 28. Vessel 24. Moisture 20 per cent. Vessel 32. Moisture 25 per 38 per 45 per cent. THE USE OF FERTILIZERS 219 increasing need for greater quantities of fertilizers. This isdoubtless the
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