Getting the right nutrient levels in the orchard starts with answering the basic questions: How much of each element does a tree need, and when does it need it? For Lailiang Cheng at Cornell University, answering the question was a matter of exerting total control and then measuring. In a series of experiments, he set out to answer one question for a very specific situation: How much nitrogen and other nutrients are needed for high-density Gala apples on M.26 rootstock in their sixth leaf to produce a high yield of good size fruit? He grew the trees in sand so […]