You force some people to hang fruit past the point of optimum edibility. This is one danger of over-emphasizing red color in the market. The fruit becomes ever-more red, but of increasingly lower quality as time passes. If you want to see really red Galas, just leave them on the tree until it is well past the picking harvest time. Potassium is a critical macro-nutrient, but should be applied to pome fruits for good reasons, and with a good plan in mind. This may not be true at all in non-irrigated areas elsewhere. When applying K to the soil, you should not try to catch up all in one year add relatively light rates over a few years. We recommend that a low soil test be backed up with a low leaf analysis before you start a K nutrient program. K deficiency is rare in the irrigated, higher K soils of the Pacific Northwest USA. I have seen bitter pit induced by soil applications of K, so I do not recommend K unless there is a possible deficiency. I don’t know how much K-induced bitter pit we have seen in the past few years, though some have wondered. Some researchers have used K nutrient sprays on fruit as a research technique to induce or increase bitter pit. Some view this nutrient program with alarm, as we are concerned about the Ca:N, Ca:K and Ca+K:N ratios in fruit skins in relation to bitter pit and other fruit calcium disorders. Though the researchers never intended this result to be interpreted this way, this data triggered a stampede in Pacific Northwest USA toward potassium as a coloring aid. Actually, what I believe they showed was, the K deficient trees had poor color, the addition of K to the irrigation water corrected the K deficiency, enabling the fruit to have more normal red color. In the early 1990’s, research in Canada, on low-K soil & drip irrigation, showed an increase in red color when K was added to the drip irrigation water.
This product group has been replaced by……. Perhaps color would be improved if this deficiency was identified and corrected. There are some soils in NC Washington that are quite low to deficient in copper. Some still use these, though no researcher has been able to duplicate the results obtained in split-block orchard trials.
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No harm, except with initial product cost. Some still cling to this stuff, hoping for effect. The treated orchard had redder fruit, which was attributed to the use of the product. The treated one was organic, and had low N levels, the untreated one was relatively vigorous, with higher N. It turned out that the original work showing a color boost compared two neighboring orchards. This came & went fairly quickly, despite colorful advertisements in industry magazines.
#APPLE COLOR FRUIT SERIES#
La Informacion sobre el Programa de 4-HĬan Nutrient Sprays Improve Apple Fruit Color?Īfter the passing of Alar, a product that helped maintain fruit quality on the tree while you waited for red color to develop, there have been a series of products that have tried to take its place.
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