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我场栽植的苹果树,早春(4月中下旬)经常遭受霜冻危害,轻者花序受冻率在20％左右,重者可达60—80％。近几年,我们采取早春灌两遍水(3月下旬和4月下旬至5月初各一次),霜冻得到一定程度的减轻。例如1980年出现三次霜冻为害,4月13日、4月18日和5月16日,在灌水的果园,元帅花序和花朵受冻率分别为60.9％和24.7％;而未灌水的果园,虽小气候条件优于灌水果园,但元帅花序和花朵受冻率分别达97.9％和61.1％。
My field of apple trees planted in early spring (late April) often suffer from frost damage, light inflorescence by the freezing rate of about 20%, severe cases up to 60-80%. In recent years, we have taken irrigation in early spring twice (in late March and late April to early May), and the frost has been reduced to a certain extent. For example, three frost damage occurred in 1980, and on March 13, April 18 and May 16, Marshal inflorescences and flower frost resistance rates were 60.9% and 24.7% respectively in irrigated orchards. However, the non-irrigated orchards Microclimate conditions are better than irrigation orchards, but Marshal inflorescence and flower freezing rates were 97.9% and 61.1% respectively.