Knowledge of the soil and its properties is necessary if the best agricultural use is to be made of the land, but as has been explained earlier, laboratory experiment and analysis can only play a limited part in the scientific approach to agricultural problems. They will often suggest new treatments and processes and, in particular instances, they may track down deficiencies and defects which are at the root of crop failure. In addition to such exploratory and explanatory work, experiment in the field is needed, and it is from this kind of work that modification in cultural practice is generally and finally brought about.
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