Abstract
Abstract Soil temperatures around roots of apple (Malus domestica Borkh.), peach (Prunus persica (L.) Batsch), and cherry (Prunus avium L.), were modified during anthesis. Cool (1.5 – 9°C) and cold (1 – 4.5°) soil temperatures in the field were achieved with white plastic covers over insulation over snow, and with coolant coils in the soil covered with insulation and clear plastic. Warm (5 – 19°) and hot (18 – 26°) soil temperatures were achieved with clear and black plastic covers over bare soil and with buried heat tapes under insulation and clear plastic. Potted peach seedlings were subjected to freezing (−3°) and warm (18°) soil temperatures in a growth chamber. No advance or delay of anthesis resulted from any of the treatments except delay in frozen soil.
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