Table of Contents Introduction Boron Manganese Iron Zinc Micronutrients For Berry Crops Deficiencies of micronutrients or trace elements are not wide spread in Ontario fruit plantings. The desirable range for micronutrients is quite narrow. More damage is possible if micronutrients are applied in excess rather than from deficiencies. For this reason, do not apply micronutrients to fruit crops unless leaf analysis or visible symptoms confirm a deficiency. Apply only the deficient nutrient in sufficient quantities to correct the problem.
Boron deficiency can have an effect on growth and fruiting.
There is currently no accredited soil test for boron in Ontario. Use a foliar analysis to check for boron deficiencies. Where a boron deficiency has been confirmed, soil or foliar applications of boron may improve boron in plant tissues. There are several sources of boron, check the manufacturer's recommended rates and timing of applications. In mild cases of deficiency there is a yellowing of the interveinal leaf areas of young leaves near the shoot-tip.