1. Look at the sky:
We need to grasp the real-time weather in the local area, mainly to see if there is a sharp cooling, continuous rain, and continuous cold currents. Because our wheat after spring chemical weeding should not only achieve good weeding effect, but also to achieve absolute safety of wheat. So before applying the drug pay attention to observe the weather forecast in the next 3-5 days weather conditions, reasonable arrangement of the agent for chemical control, then Anhui Province after the spring weeding Gao Feng from the weather forecast to see after February 20, but after February 20 there is an uninterrupted cloudy day, light rain, then we have to cold tail warm head, see the seam needle application, while the choice of the drug is also exquisite!
2. Look at the seedlings:
Second look at the seedlings: due to the sharp cooling of some time ago, there are many areas of wheat frost damage problems of varying degrees, while the snow melts three ditches are not passable, there are also stains, seedling yellow problems, for such a field block this time is not recommended to weeding, it is recommended to solve the problem of low temperature frost damage, stain damage, weak seedlings, yellow seedlings! At the same time, for wheat that has not entered the jointing period, it is recommended to wait until after the 24th to weed!
Another to check whether the wheat is jointed; pull up the wheat and touch the base of the stem with your hand, there is a joint that begins to elongate 1-2 cm, generally measure a flat finger with your hand! This is the time to start pulling together! Wheat jointing is not recommended to apply medicine! If you must apply the medicine, wait for the wheat to be pulled more than 5-6 cm, and choose a relatively safe agent for chemical weeding! Because the wheat begins to joint is basically the first section to begin to elongate between the first section and the second section to begin to elongate, this time the joint is the key period of wheat ear differentiation; wait until the differentiation of young ears above 6 cm tends to be stable after applying the drug!
3. Look at the fields
Check the humidity problem in the field; the applied field block does not sink the foot, there is no standing water before and after the application; the snow in the previous period of time, resulting in a lot of field humidity is relatively large, then after the use of chemical herbicides after the application of water, the field must not have water, otherwise it will lead to wheat drug damage, water accumulation leads to wheat root anaerobic respiration can not normal nutrient transmission and safe detoxification, and eventually lead to serious yield reduction. Before and after this application, we must clear the three ditches! There was a few days of continuous rain in the back!
4, look at weeds: at this time, chemical weeding has reached the most critical period, we must go to the field to check the density and type of weeds to reasonably carry out pharmaceutical control! We can't blindly go to the store to buy medicine and follow the trend to go to the store to get medicine; because weeds are more complicated, and the situation is different from field to field! There is no chance of weeding after spring!
5. Chemical weeding appropriately increases the amount of medicine
Due to the temperature rise, the speed of weed growth is accelerated, the grass age is large, the density of weeds is large, and the chemical weeding must be carried out with sufficient dosage and reasonable compounding for one-time prevention after the temperature is stable! Even if you can't kill all the weeds, you can suppress the harm of weeds, and the harm after the wheat grows up is not much! So don't choose a single herbicide to use control, generally choose 2-3 kinds of herbicide compound use effect is good! Early spring administration is 15%-20% higher than pre-winter chemical weeding; early spring weeds are vigorous and dense, and the control agent should be improved, but it cannot be blindly improved!