Nutrition is the biggest expense a grower will face when establishing a crop, so efforts are taken to make sure it is matched to the requirements of the soil and the crop. Soil testing before establishment gives an indication of what these requirements may be, but it becomes more complex when tissue or sap analysis in the spring shows there are deficiencies within the plant. “When we look at macronutrients, phosphate is often the one that gets locked up,” explains Farmacy’s head of soil services, Jade Prince. “Growers will see indices of two or three, but this fails to show…