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1.本文系根据作者两年来的試驗結果,确定短日照是过早播种情况下黃麻早花的主导因子。不同品种的早花现象与其光照阶段发育特性密切联系,要确定该品种的早播适期,关鍵在于了解它的光照阶段发育特性。2.不同的黄麻品种具有不同的光照阶段发育特性:粤园一号的光照阶段开始期在出苗后9——12天,而在10小时日照下經过15——21天便可以通过;东莞园果在出苗后12——15天起,而通过光照阶段要求9——15天;新长一号在出苗后6——9天起,而通过光照阶段要求6——12天。3.试验用的三个黄麻品种(新长一号、粤园一号及东莞园果)的光照临界长度均为13.5——14小时。4.在过早播种的情况下,当其日照长度短于光照临界长度时用人工延长光照至14小时以上或夜间給予短暂光照20——30分钟均可以明显地延迟黄麻的开花期,因而获得较高大的植株。
1. This article is based on the author’s test results over the past two years to determine the short-day light is the case of premature sowing Jute early flowers of the leading factor. The early flowering phenomenon of different varieties is closely related to the developmental characteristics of its light stage. The key to determining the suitable early sowing stage of this variety is to understand the developmental characteristics of its light stage. 2. Different varieties of jute have different light stage developmental characteristics: the first stage of the light of Yueyuan 9 - 12 days after emergence, and after 15 - 21 days under 10 hours of sunshine can pass; Dongguan The orchard is between 12 and 15 days after emergence, and requires 9 to 15 days through the illumination stage. The new one takes 6 to 9 days after emergence and requires 6 to 12 days through the illumination stage. 3. The test of the three jute varieties (New No. One, Gardenia and Dongguan garden fruit) the critical length of the light are 13.5--14 hours. 4. In the case of premature sowing, when the sunshine length is shorter than the critical length of light, prolonging the light by artificial lighting for more than 14 hours or by giving a short light at night 20 - 30 minutes can significantly delay the flowering period of the jute and thus obtain Tall plants.