论文部分内容阅读
问:小麦播种前怎样调查地下害虫发生情况?如何掌握防治标准? 答:麦播季节即将到来,掌握地下害虫的发生情况,是做好防治工作的基础。播种前选择有代表性的田块,按不同土质、地势、茬口、水、旱地等分别进行调查。一般在15亩左右的田块上,采用随机取样法,取8个样点,每点取样面积为四分之一平方米(即50厘米×50厘米)、深30厘米。仔细检查,查清优势虫种,折算每平方米虫数。
Q: How to investigate the occurrence of underground pests before sowing? How to control the standards? A: The sowing season is approaching, to grasp the occurrence of underground pests, is to do the prevention and treatment foundation. Select a representative plots before sowing, according to different soil, topography, crop rotation, water, dry land, etc. were investigated. Generally about 15 acres of plots, using a random sampling method, take eight samples, each sampling area of one quarter of a square meter (ie, 50 cm × 50 cm), 30 cm deep. Careful inspection, check the advantages of species, conversion per square meter number of insects.