FRUIT THINNING AND MARKET PRICE OF GOLDEN DELICIOUS AND COX'S ORANGE PIPPIN PRODUCTION

H. Janssen
There is a negative correlation between the density of fruit setting (yield of crop respectively) and the fruit diameter of apples. A big crop gives small apples and vice versa. Furthermore there is a negative influence on the yields of the next year (biennial bearing) when the crop of this year exceeds a certain limit (biennial bearing limit). This limit depends on the individual situation of an orchard (apple varieties, soil conditions, micro-climate, intensity of cultivation etc.).

The economical aims of fruit thinning are:

  1. in short run view: getting a better price and thus a higher gross return in the same year by increasing the average of fruit size,
  2. in long run view: getting a higher return in the following year by reducing the crop of this year and increasing it next year.

Undoubtedly a medium degree of fruit thinning against biennial bearing will be of economical utility, because in the "off"-years there are usually higher prices to be gained than in the "on"-years. Whether there will be an economical profit by fruit thinning in the same year or not, depends mainly on:

  1. the initial fruit setting degree,
  2. the scale of fruit setting reduction,
  3. the resulting scale of fruit size increase,
  4. the market prices for the different classes of fruit size.

Furthermore the special costs of fruit thinning and of fruit picking will influence the economical results of fruit thinning.

This paper, by means of model calculation results, is dealing only with the short run influence of fruit setting and market price on the gross returns of Golden Delicious and Cox's Orange Pippin production.

Janssen, H. (1969). FRUIT THINNING AND MARKET PRICE OF GOLDEN DELICIOUS AND COX'S ORANGE PIPPIN PRODUCTION. Acta Hortic. 13, 152-169
DOI: 10.17660/ActaHortic.1969.13.16
https://doi.org/10.17660/ActaHortic.1969.13.16
13_16
152-169