Show the food Is the fundamental mistake out of which grew the gloomy doctrines of the older theorists was in measuring the possibilities of production by what they knew of soil culture science had not revealed to them that aside from proper temperature and moisture the essential factor in vegetable production is plant food that this may be given to the plant without the aid of the soil that what they understood by soil fertility is a comparatively unessential factor of agricultural production that in short the possibilities of the food supply in the future are measureless professor atwater in century |