Bloom is upon us in wine grapes and vines will see significant increases in nutrient demand in the coming weeks.
A proactive approach to nutrition management requires understanding of crop dynamics. As flowering subsides and berry set takes place we need to anticipate the deficiencies that may arise. Nitrogen and potassium are required in almost equal amounts with a peak demand mid-season. Calcium, on the other hand, is immobile and requires timely supplementation through the growing season. At berry set, adequate levels of Mg can support photosynthesis and also reduce bunch stem necrosis. Zinc and boron provide support for cell division and strengthening of cell walls and membranes respectively.
Nitrate carries cations with it. Ammonium uptake even hampers cation uptake.