Statistical determination of the response of apple trees to cultural methods

Text from page 1: "Within recent years the subject of orchard tillage has come to be one of much interest to the fruit growers. It is only within the last few decades that tillage has been regarded as important. This may seem the more remarkable when we consider that other horticultural practices such as pruning, propagation, etc., reached a high degree of development some centuries ago. The improvement of varieties, too, has been developing for scores of years."