Functions of straw carbon:
1. Straw carbon has remarkable economic and social benefits;
the technology of returning crop straw to the field is mainly the technology of directly returning the crop straw to the field by mechanical crushing, which directly crushes the crop straw in the field and scatters it on the surface, and then ploughs it into the soil to decompose it, thus improving soil fertility and increasing agricultural production and income. Mechanized straw returning technology has remarkable economic and social benefits.
2. Increase soil organic matter and increase fertility.
Straw contains elements such as nitrogen, phosphorus, potassium, magnesium, calcium and sulfur, which are essential nutrients for crop growth.
According to the determination, the average content of organic matter in straw is about 15%. If the straw is returned to the field for 15t per hectare, the organic matter can be increased by 225kg/hm2. According to statistics, at present, China produces 6 million tons of straw every year, including more than 3 million tons of nitrogen, more than 7, tons of phosphorus and more than 7 million tons of potassium, which is equivalent to more than a quarter of the total amount of chemical fertilizers applied in China at present.
3. Improve the soil environment and transform low-and medium-yield fields.
Straw contains a lot of energy substances, and after returning to the field, the biological activity of soil is increased, and the activity of contact enzyme can be increased by 47%. With the increase of microbial fecundity, biological nitrogen fixation increases and alkalinity decreases, which promotes the acid-base balance of soil and tends to be reasonable in nutrient structure.
In addition, returning straw to the field can reduce the soil capacity, loosen the soil, improve the aeration, reduce the specific resistance of ploughing and obviously improve the soil structure.
4. organic matter cover is formed to resist drought and conserve moisture.
Returning straw to field can form ground cover, which has many advantages such as inhibiting soil moisture evaporation, storing precipitation and raising ground temperature. According to the measurement, for six consecutive years, the straw directly returned to the field, the soil's water retention, air permeability and thermal insulation capacity were enhanced, the water absorption rate was increased by 1 times, and the ground temperature was increased by 1 ~ 2.
After returning the corn stalk to the field, it is equivalent to adding 35kg of ammonium nitrate, 375kg of phosphate fertilizer and 37.5kg of potassium phosphate. If the straw is returned to the field for three consecutive years, the average yield of wheat and corn can be increased by 1% ~ 2%.
Extended information
Preparation of straw carbon:
Straw carbon is made of corn, cotton, soybean, wheat, rice and other crop straws, peanut shells, sawdust, dead branches and weeds, etc., using the principle that coal is formed underground, the raw materials do not need to be crushed, and there is no strict requirement for dry and wet. Straw biomass is naturally decomposed, and it can be obtained after 6-8 hours under the condition of air isolation.
in the carbonization process, no chemical raw materials, electricity and other equipment other than the carbonization tank are added, and the carbonization tank does not need to be sealed or covered, so the whole carbonization process has no cost and will not cause pollution, and the adhesive is added for molding.
At present, we can produce five kinds of products, such as honeycomb briquette, briquette, charcoal stick and barbecue charcoal. It is a tungsten-gold product that replaces traditional raw coal; A new type of clean and environmental protection energy with bright prospects and great attention from the state.
Baidu encyclopedia-straw coal