The Fruit Variety and its Environment

Abstract

Of the thousands of fruit varieties that have been named and described, experience has eliminated all but a few. Most of those now propagated in America are grown commercially, some of them profitably, in some environmental complexes. Besides soils and rootstocks, some of the environmental complexes. Besides soils and rootstocks, some of the environmental features that may determine the suitability of a deciduous variety for a situation are (1) temperature in the coldest winter, spring or autumn nights; such nights preclude successful commercial ofchard culture from much the largest part of the United States and Canada, and influence the choice of varieties in some areas; (2) length of the frost-free period; (3) summer temperature and humidity; (4) number of hours of winter temperature as low as 45°F of lower; (5) undetermined influences; (6) competition and (7) enemies.