دانلود رایگان کتاب Soil Fertility and Animal Health
The modern farmer and stockman has to be quite a man to stay in business. He has to have plenty of energy and character to keep things under control, meet emergencies, and not neglect any of his regular duties. But in addition he has to know more about more things than a lot of men who were allowed to practice medicine a half-century ago. He cannot afford any unnecessary guess-work and this means that he must make all use he can of scientific knowledge …..