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Abstract
A pear anthesis phenology model was used to determine timing of placement of reflector boards near ‘Seckel’ pear trees, or polyethylene hotcaps over them to accelerate their bloom for optimum pollination of ‘Anjou’. The normal full bloom date of ‘Anjou’ was predicted from the Utah chill unit (CU) and growing degree hour (GDH) models. ‘Bartlett’ pear phenology and historical bloom divergence of ‘Seckel’ and ‘Anjou’ were used in the absence of ‘Seckel’ and ‘Anjou’ phenology to determine the timing and amount of supplemental thermal accumulation. Bloom-accelerating techniques were placed on the pollinizer trees at an intermediate anthesis stage. Polyethylene hotcaps accelerated bloom effectively.
Abstract
The influence of 6 rootstocks on growth and productivity of spur and non-spur ‘Delicious’ and ‘Golden Delicious’ apple (Malus domestica Borkh.) trees was investigated. The spur-type ‘Delicious strain (‘Miller Spur’) consistently produced more fruit per tree than the regular-type strain (‘Red Prince’). In contrast, standard ‘Golden Delicious’ produced as much or more per tree than the spur-type strain ‘Goldspur’ even in the early years. ‘Miller Spur Delicious’ trees were largest on seedling rootstock, intermediate on Mailing (M) 104, and smallest on M 111, M 106 and M 7. ‘Goldspur Golden Delicious’ resembled ‘Miller Spur Delicious’ in size, except that trees were significantly smaller on M 7 than on M 111 and M 106. At the end of the 9th season, ‘Red Prince Delicious’ and ‘Golden Delicious’ were largest on seedling, followed by M 111, M 106, M 7 and M 26 in descending order. Biennial bearing of some trees on all rootstocks reduced yield and increased tree-to-tree yield variance.
Abstract
Fruits of ‘Delicious’ apple (Malus domestica Borkh.) were grown under differing radiant flux densities (rfd
Abstract
A model has been developed that relates the stages of spring bud development of ‘Redhaven’ and ‘Elberta’ peaches (Primus persica (L.) Batsch) to an accumulation of growing degree hours following rest completion. The accumulation of growing degree hours is based on a lower limit of 4.5°C and an upper limit of 25°.