Deficiency: nf The vine can suffer from various deficiencies, particularly in mineral and nutrient elements.
Nitrogen deficiency, cause of yellowing and premature leaf drop.
Phosphorus deficiency resulting in poor leaf growth.
Potassium deficiency first manifesting as a change in leaf color or sheen. It becomes shiny or tanned. Subsequently, the sheet tends to curl. Finally, marginal discoloration may appear which is...
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