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Carbohydrate Model Results for May 21, 2018

Posted: May 21, 2018

Saturday in central Pennsylvania was overcast all day with early morning rain followed by rain on Sunday morning and sun in the afternoon.
M27 trees in bloom. Photo: Rob Crassweller, Penn State

M27 trees in bloom. Photo: Rob Crassweller, Penn State

The low solar radiation at some sites resulted in recommendations for lower chemical thinner rates while western, eastern and south-central areas of the state had sufficient solar radiation and temperatures to recommend standard thinner or an increase in thinner rates. This emphasizes the need for individual locations to be evaluating their local conditions. As mentioned in last Friday’s report, fruit size is still not very large but should continue to grow this week. Tuesday’s weather is calling for thunderstorms across the state with the rest of the week being somewhat clear skies and temperatures in the low to mid-70’s or higher.

Some of you may wonder how the recommendations are developed. On the NEWA site, under the More Info tab, the table describes the rules for the recommendation based on the 4-day average balance. For example, the recommendations for today were arrived at from taking the estimated values in the daily balance column for today, May 21, and those for May 22, May 23 and May 24 and determining the average. So the value suggested for today is based on the predicted temperature and solar radiation levels for those dates. As mentioned many times if the predicted weather turns out to be different, then the 4-day average balance will change.

Apple Carbohydrate Thinning Model Data