论文部分内容阅读
密云县库北低山区,共包括高岭、不老屯、半城子、上甸子4个乡,总面积47万亩。全地区属于燕山余脉的低山区,北高南低,海拔140～800米。土层较厚、土质贫瘠。年平均温度10.2℃,年降水量357～731毫米(据上甸子气象站1983～1986年资料),无霜期176天左右。本区位于温带落叶果树带的北界边缘,自然环境条件对于大多数温带落叶果树的生长发育,仅能低度满足,问题不少,包括花期晚霜为害频繁,春季干旱又不具备灌溉条件等严重问题。一、重要病害发生情况 3年来,在当地11种果树上共收集到病害36种,其中苹果病害16种,梨病8种,栗
Miyun County, northern low mountains, including a total of Kaolinite, not Laotun, half Chengzi, Shangdi 4 sub-township, with a total area of 47 mu. The whole area belongs to the Yanshan Mountains of the low mountains, north high south, 140 to 800 meters above sea level. Thick soil, poor soil quality. The annual average temperature of 10.2 ℃, the annual rainfall of 357 ~ 731 mm (according to Shangdizi weather station 1983 ~ 1986 data), frost-free period of 176 days. This area is located at the edge of the northern edge of the temperate deciduous fruit tree belt. The natural environmental conditions are only low enough for the growth and development of most temperate deciduous fruit trees. There are many problems, including frequent frost damage in flowering late frost, severe drought in spring and lack of irrigation conditions problem. First, the incidence of important diseases 3 years, 11 kinds of fruit trees in the local collection of 36 kinds of diseases, including 16 apple diseases, 8 pear diseases, chestnut