Vegetables are often eaten in our daily lives. In the process of vegetable cultivation, weed problems are more common. When using herbicides , the following safety points should be noted.
First, the rational selection of herbicide varieties
There are many varieties of herbicides, different herbicides have different weeding objects, and different vegetables have different adaptability to herbicides. Therefore, rational selection of herbicides is essential. According to the test and demonstration, the following herbicides are safe and low-toxic to vegetables.
148% trifluralin emulsifiable concentrate, 100-150 ml per mu, suitable for Chinese cabbage, Chinese cabbage, celery, radish, carrot, kidney bean, and kidney bean. Before planting, the soil is treated before tomato, pepper, eggplant, cabbage, and broccoli are planted.
225% herbicide ether wettable powder 300-400 grams, used for kidney beans, cowpeas, carrots, celery, oysters before sowing and cucumber, tomato, pepper, broccoli before planting soil. It can also be mixed with 50% of 50% chlorpyrifos WP for better results.
350% chlorpyrifos WP can be used in 200-250 grams per acre for soil treatment of celery, root leeks, carrots and alfalfa before sowing.
433% Shitian emulsifiable concentrate, 100-150 ml per mu is suitable for soil treatment before bean, potato, pea, leeks, cruciferous seeding and colonization of Solanaceae vegetables.
520% dichlorfen emulsifiable concentrate, 250-300 ml per mu, suitable for radish, cabbage, kidney beans before sowing and soil treatment before eggplant, tomato, pepper, cabbage, potato, watermelon colonization.
Second, improve the quality of medication
The effectiveness of herbicides on weed control and the timing of drug use are closely related to the quality of the drug. Therefore, the following issues must be noted:
1 Master the amount of medication. It is necessary to achieve "two accurate", that is, the field area is accurate and the calculated dose is accurate. In the field with high organic matter content, the microbes are used to remove the herbicide, and the clay has an adsorption effect on the herbicide. Therefore, the dosage of such fields should be appropriately increased. Otherwise, the dosage of the thin field and the sandy field should be reduced as appropriate.
2 master the medication time. Trifluralin, dichlorfen, herbicide ether, chlorpyrifos and shitianbu are all soil treatment agents, which are mainly absorbed by the roots and shoots of weeds to inhibit the growth of weeds. It is usually applied before emergence or before planting after crop sowing. Jinghecao is a stem and leaf treatment agent, which is destroyed by the stems and leaves of weeds to destroy the dividing tissues. The time of application should be in the three to six-leaf stage of grass weeds.
3 The soil treatment agent must be sprayed after the rain or after watering, that is, when the soil moisture content is 20%-30%, the soil should be mixed 2-3 cm deep in addition to the Fluorine spray to prevent photolysis, other Types of herbicides generally need to protect the soil membrane, avoid mixing soil and trample.
4 master the amount of medication used. Each acre of 25-30 kg of water must be evenly sprayed, and the sprayer used does not run, run, drip or leak.
5 When using herbicides in solar greenhouses and greenhouses, high temperature should be ventilated and ventilated to avoid phytotoxicity.
6 Cucumber, lettuce, and Artemisia scoparia are sensitive to trifluralin and chlorpyrifos herbicides. Celery and carrot are sensitive to dichlorfen. Liliaceae vegetables such as leeks and green onions are sensitive to herbicides, and they are used in the past. The field of herbicides is also very sensitive, and care should be taken to avoid application and contact. The effect of herbicides on controlling weeds in vegetable fields and the safety of vegetables is closely related to the climate, soil quality, vegetable varieties and cultivation methods. Therefore, the use of each herbicide should follow the test and demonstration. The principle of “promoting†to achieve the effect of labor saving, safety, high efficiency and high yield.
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Site Selection for Mass Flow Meter Installation
a) Sensor stays away from mechanical vibration source, for example, pump. Use flexible pipe to connect meter with pipeline if inevitable. The housing of meter must be standalone, out of touch with any other device. There must be 3 times the size of sensor between 2 sensors if there are many flow meters on the same pipeline, to avoid resonance.
b) Do not install sensor on pipeline that easily expands with hot and contracts with cold, especially near expansion joint, which leads to a worse stability.
c) Sensor stays away from industrial electromagnetic field, such as large generator and transformer, better 5m at least. Such device influences the performance of drive coil and pickoffs. Make sure magnetic field intensity less than 400A/m.
d) Sensor shall be installed on lower pipeline, to be easily full of fluid.
e) Make sure Ex-mark meet application requirements if in hazardous area.
f) Build a sunshade if the meter is under direct solar radiation. g) Keep the meter from corrosive liquid.
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