Bone meal is also a good source of calcium. Copper Copper is an excellent natural fungicide, controls diseases of vine crops, potatoes, leaf spot, anthracnose, downy mildew, powdery mildew, scab, fire blight, bacterial spot. Available in liquid or dust form. Excellent for use on melons and cucumbers. Can be used as a liquid for spraying or as a dust for dusting.
Magnesium Is available in Epsom salts.
Available at most drug stores. Magnesium will help to reduce stress on the plants. Plants can become stressed out due to minerals not being available to them. High nitrogen causes imbalances in the soil, and plants bio-mechanisms, resulting in the locking up of trace minerals in the soil, and the inability of the plant to intake the required minerals. You can apply at the rate of 1 cup Epsom salts to 1 gallon water, sprayed on leaves.