The harm of Pesticide Chemical Fertilizer: chemical Fertilizer can also be used as Pesticide? Excessive harm of chemical fertilizer to soil

One of the biggest problems in agricultural production is the problem of diseases, insect pests and weeds. In order to control diseases, pests and weeds, pesticides are essential, and pesticides have a certain toxicity, which will have an impact on the environment and crops, so can chemical fertilizers be used as pesticides?

One of the biggest problems in agricultural production is the problem of diseases, insect pests and weeds. In order to control diseases, pests and weeds, pesticides are essential, and pesticides have a certain toxicity, which will have an impact on the environment and crops, so can chemical fertilizers be used as pesticides?

In fact, many fertilizers have the effect of killing and repelling pests, and ingenious fertilization can increase soil fertility and prevent pests. It is not only beneficial to human health, but also can prevent or reduce the resistance of diseases and insect pests, but also protect the natural enemies of pests, which can be said to kill many birds with one stone.

The following editor will introduce to you several methods of using fertilizer instead of medicine to control pests for your reference.

Phosphate fertilizer: Helicoverpa armigera is very sensitive to phosphorus during its spawning period and escapes when it encounters phosphorus. If the cotton bollworm is sprayed with 2% superphosphate solution during the spawning period, leaving 1 bed without spraying every 5-6 beds, it can drive the cotton bollworm to lay eggs centrally so that it can be wiped out.

Second, nitrogen fertilizer: urea, ammonia bicarbonate and ammonia water are volatile and have definite stimulation, corrosion and fumigation to insect pests. Using urea 25O?8OO grams, adding washing powder lOO grams, adding water 150 kg spraying wine, can control red spiders, aphids and other pests. Spraying with 1% ammonia bicarbonate solution during the occurrence period of insect pests, spraying once every 5-6 days for 2 times in succession, had obvious effect on red spiders, yellow spiders, thrips and aphids with small body and weak endurance, and the general insecticidal rate was 80%. However, the concentration must be strictly controlled in the process of use, and the concentration must not be too high and burn the crops.

Third, grass ash: that is, firewood, fallen leaves, straw, grain husk and other residual ash after combustion. It mainly contains calcium oxide and potassium carbonate, which is alkaline. Grass instead of pesticides? Ash, it is required to be dry and not damp when used. Usually use grass per mu? Grey lO?l5 kg, soaked in 5O?75 kg water, filtered after one day and night, filtered and sprayed with wine, can effectively control aphids. With grass? Grey 2O?3O kg, ditch or hole application around the roots of vegetables and fruits has a good effect on the control of vegetable root pests such as onions, garlic, leeks, melons and so on.

Lime: in the rainy season, leafy vegetable crops in vegetable fields with lower terrain and higher ground temperature are easy to be harmed by snails, so chemical control is generally difficult to be effective. After the dew is dry on a sunny day, when the air humidity is low, the sifted dry fine lime powder is scattered on the soil surface between the vegetable rows, so that when the snail climbs over the lime, the snail will stick to the powder and cause its software to dry and die without water, and the effect is remarkable. In cloudy and rainy days, lime powder is easy to form large aggregates and lose adhesion in rainy days, so it should be carried out in sunny days.

5. Green alum: farmers whose chemical name is ferrous sulfate and lack of plant ash can use 1 part of green alum with 3000 parts of clear water. after fully dissolving, watering the roots or rows of crops such as onions, garlic and leeks can effectively kill root maggots, and the control effect is more than 8%.

Silicon-calcium fertilizer: corn, soybean and other crops, apply silicon-calcium fertilizer 3040 kg per mu, can avoid corn borer, pod borer harm. The harm of armyworm can be greatly reduced by applying silicon-calcium fertilizer 20kg / mu to rice, wheat and other crops.

7. Mixed use of fertilizer and medicine: adding 50% dichlorvos EC (concentration 1%) to 1% urea solution to spray wine can kill red spiders that harm citrus, cotton and flowers. Spraying wine at the booting stage of rice with 40% dimethoate EC 50 grams per mu, urea 250 grams and water 50 kg per mu can not only control rice pests, but also promote rice yield. In the seedling and early flowering stage of soybean, 50 grams of ammonium aluminate, 50 grams of phoxim EC and 50 kilograms of water spraying wine per mu can control soybean molybdenum deficiency, aphids and pod borer.

8. Others: mix fresh rabbit, sheep and cow dung with 5 parts of water and pour them around the roots of chili, eggplant, tomato, cabbage and beans in sunny days, which can effectively drive away underground pests such as ground tiger, beetle, mole cricket and so on.

Harm of pesticides and fertilizers:

Lead to the change of soil pH, calcium superphosphate, ammonium sulfate, ammonium chloride and so on are all biological acid fertilizers, that is, after plants absorb nutrient ions in fertilizer, hydrogen ions in soil increase, which is easy to cause soil acidification.

Long-term large-scale application of chemical fertilizer, especially in the continuous application of a single variety of chemical fertilizer, can occur in a short period of time. Soil acidification will lead to the release of toxic substances, or enhance the toxicity of toxic substances, resulting in adverse effects on organisms.

Soil acidification can also dissolve some nutrients in the soil, under the action of rainfall and irrigation, infiltrate and recharge groundwater, resulting in the loss of nutrients, resulting in soil impoverishment, affecting the growth of crops, resulting in soil hardening and fertility decline.

The application of a large amount of chemical fertilizer does not support the land, resulting in the decrease of soil organic matter, and chemical fertilizer can not compensate for the lack of organic matter, which further affects the survival of soil microorganisms, not only destroys the soil fertility structure, but also reduces the fertilizer efficiency.

Harmful substances pollute the soil. Mineral raw materials and chemical raw materials for the manufacture of chemical fertilizers contain a variety of heavy metal radioactive substances and other harmful components, which cause pollution when fertilized into the soil.