As some of you may remember, my allotment grape vines got badly hit by frost back in mid-May. They are both growing back nicely now, but on one of them almost all of the leaves are golden in colour, rather than green. I looked this up, and it seems it is almost certainly iron deficiency. Only iron deficiency will make the entire leaf, even the youngest, newest leaves, turn yellow like that. Other deficiencies cause inter-veinal yellowing or mottled yellowing, as too do any diseases which can cause yellowing.
What's odd is that I am at a loss for what caused it to suddenly be deficient of iron. The previous growth, before the frost came, was green and healthy, and the other grape vine, grown just a few metres away on much the same soil, is green and healthy, as are the grape vines on other people's plots. It's just this one. I suppose the dry weather is a possibility, but I think I've been keeping it fairly well-watered.
I plan on buying some sulphate of iron, both to add some to the soil and dissolve some in water to use as a foliar feed, and I've already given it a dressing of poultry manure, but I'm slightly concerned about what might have caused this, and whether it can be trusted to go away on its own with time and feeding.
What's odd is that I am at a loss for what caused it to suddenly be deficient of iron. The previous growth, before the frost came, was green and healthy, and the other grape vine, grown just a few metres away on much the same soil, is green and healthy, as are the grape vines on other people's plots. It's just this one. I suppose the dry weather is a possibility, but I think I've been keeping it fairly well-watered.
I plan on buying some sulphate of iron, both to add some to the soil and dissolve some in water to use as a foliar feed, and I've already given it a dressing of poultry manure, but I'm slightly concerned about what might have caused this, and whether it can be trusted to go away on its own with time and feeding.
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