Volume 55 Number 2 Article 18
Year 2001 Month 4
Title: ´Hedelfingen` Sweet Cherry Fruit and Tree Growth Responses to Thinning and Five Rootstocks
Authors: C. Choi and R.L. Anderson
Abstract:
Four dwarfing and one traditional, full-vigor, sweet cherry rootstocks; and several hand thinning vs.
unthinned treatments were studied for their effects on horticultural characteristics of 'Hedelfingen' scion
cultivar.
Tree sizes, expressed in terms of TCSA (Trunk Cross Sectional Area), of 'Gisela 1' and 'Damil'
were about 1/3 to 1/4 that of trees on 'Mazzard'. 'Gi 196/4' and 'Gisela 6' were about 1/2 of 'Mazzard',
with 'Gi 196/4' being slightly bigger than 'Gisela 6'. Fruit diameter was also influenced by rootstocks.
'Mazzard' and 'Gi 196/4' had relatively large fruit size among rootstocks.
Hand thinning increased fruit
size when averaged across rootstocks.
Its effect on fruit size depended on rootstocks.
Semi-dwarfing
rootstocks with high crop density responded well to thinning.
The photosynthetic resource limitation
began to be shown in the beginning of phase III of development because it was at this point that the difference in fruit size between the thinned and unthinned treatments was manifested.
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