日本海棠促成栽培需冷量研究

Study on The Chilling Demand of Japanese Quince Forcing Culture

以日本海棠为试材，观测了4个不同品种解除休眠对低温的需求量，结果表明：不同品种的日本海棠解除自然休眠的低温需求量明显不同，在地处暖温带的鲁西南地区，复长寿、银长寿于12月上旬，长寿冠于12月下旬，世界一于1月上旬结束自然休眠。通过7．2℃模式、0～7．2℃模式、犹它模式的对比分析，发现7．2℃模式作为鲁西南地区日本海棠低温需求量的标准最为适合。按照7．2℃模式，供试品种的低温需求量范围是383-916h。

Usd Japanese quince as experimental materials,an experiment was carried out to observe the chilling requirement of 4 different varieties for breaking dormancy,which indicated the chilling requirement of different varieties for breaking dormancy were obviously different.In the southwest of Shandong province,belonging to the warm temperate zones,the duplicate longevity crab-apple and silver longevity crab-apple broke their natural dormancy in the first ten days of December;the longevity crown crab-apple broke its natural dormancy in themiddle ten days of December;the world optimum crab-apple broke its natural dormancy in the first ten days of January of next year.Based on the comparison and analysis of 7.2℃model、0~7.2℃model、Utahmodel,7.2℃model was regarded as themost appropriate criterion for calculating the chilling requirement of Japanese quince in the southwest of Shandong province.According to 7.2℃model,the chilling requirement of the 4 varieties for experiment was from 383 hours to 916 hours.