At present, the wheat has entered its initial period, and management has entered a key stage of adjusting the wheat population. In this stage, scientific management should be carried out in accordance with the development of individuals and groups in wheat fields, soil moisture content, occurrence of diseases, pests and weeds. The second and third types of wheat fields with small populations, spring wheat seedlings with weak green fields, drought wheat fields, heavy wheat fields with red spiders, and wheat fields requiring spring chemical weed control are the key wheat fields. 1. The second and third types of wheat fields with small groups or weak individuals. The wheat fields that normally grow green are less than 700,000 in the wheat growing season, which is a group of small-scale wheat fields; the winter freezing damage is heavy, returning to late evening, the growth is slow, the plants are weak, the population is less than 800,000, and the population is small and the individual is weak. The first time of spring water management should be stepped up. Second, drought wheat fields. Due to the low rainfall after wheat returned to green and the failure to take early buckwheat buckwheat, the dry soil layer of the wheat field has reached 2-3 cm. In the wheat field with a population of 800,000 - 1 million, a standard wheat field has been established. However, if the drought seriously affects the growth of wheat, it is necessary to perform top dressing timely in the middle and later stages of wheat development. Third, the red spider harm the wheat field. When wheat ridges have a single row of 33 centimeters, 200 insects or 6 insects per plant, and most of the leaves are covered with white spots, they must be controlled in time. Before the jointing stage of wheat, the temperature is low, and it is advisable to spray at noon. It is possible to use insecticides such as chlorpheniramine, dimethicone, and bismuth. Fourth, the need for chemical weeding wheat fields. The period of wheat is the key period of wheat chemical weeding in spring and it should be used in time. It should be noted that: First, tribenuron plus tribenuron-methyl should be used to increase the amount of medication; Second, it should be in the sunny, windless sunny days from 9 am to 4 pm; Third, the concentration should be reasonable, generally per acre spray Application of 30-45 kg of liquid (2-3 sprayer); Fourth, the sprayer should be strictly cleaned, immediately after use, the bucket and parts should be washed with clean water several times, and then the water shall be filled with a sprayer and soaked for 12-24 hours. Wash 2-3 times; if the container is filled with 2,4-D butyl ester, wash thoroughly with 0.5% ferrous sulfate solution. Single Door Safe Box,Large Office Safe Box,Biometric Password Safe Box,Jewelry Safe Box Hebei Tiger Brand Group Jia Bao Cabinet Industry Co. LTD , https://www.cntigersafe.com