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一、基本情况 衡山位於北纬27至28度之间,全年平均温度为17.8℃;月平均温度有九个月在11.3——30℃之间,很适宜於甜橙的生长。加以该县北面多山,境内河流纵横,温度的变化又得调节。每年甜橙的生长期,从惊蛰(3月6日)春梢开始萌芽,至立冬(11月8日)後,多梢停止生长,共有240日以上,这是栽培上很有利的条件。但每年12月至次年1月间,绝对最低温有时可降至—7℃,生长上仍然遭受妨碍,故对如何加强技术措施,以使安全越冬,需待研究。 当地各年度平均雨量,共计1,428m.m.,其中1—3月占20.5％,4—6月份占41.31％,7—9月份占21.69％,10—12月份占16.51％。全年雨量分布,偏於夏季,春、秋、冬三季依次较少。特别是秋季缺雨,影响秋梢生长,造成结果大小年和低产裂果现象,因此调节土壤的水份问题,值得我们注意。
First, the basic situation Hengshan located between latitudes 27 to 28 degrees, the annual average temperature of 17.8 ℃; monthly average temperature of nine months at 11.3 - 30 ℃, it is suitable for the growth of sweet orange. To the mountainous north of the county, the territory of the vertical and horizontal rivers, the temperature changes have to be adjusted. Every year, the growing season of sweet orange begins with spring shoots of Jingzhe (March 6). After the beginning of winter (November 8), many shoots stop growing for more than 240 days, which is a very favorable condition for cultivation. However, between December and January of the following year, the absolute minimum temperature may sometimes drop to -7 ° C and the growth will still be hindered. Therefore, it is necessary to study how to strengthen technical measures so as to ensure safe winter. The average annual rainfall in the region totaled 1,428m.m., with 20.5% in January-March and 41.31% in April-June, 21.69% in July-September and 16.51% in October-December. Annual rainfall distribution, partial to summer, spring, autumn and winter followed by less. In particular, the lack of rain in autumn affects the growth of autumn shoots, resulting in the size of the year and the fruit yield of low yield. Therefore, it is worth our attention to regulate the soil moisture.