The focus of wheat management after the year is fertilization, weeding and pest control.
When it comes to weeding, 90 people now immediately think of what herbicide to spray and when to spray it, and few people think of using a hoe to weed. Why can't we do the same thing as before?
Chemical weeding has been carried out for so many years, I don't know if everyone has paid attention to it, and now the grass is getting rid of more and more, which is the first problem that appears. Before the 80s, no herbicides were used, crops did not grow as well as they do now, there was little miscellaneous in the field, and the main crops such as wheat, corn, and cotton were hoeed manually.
It can be destroyed after one or two times. The reason is that chemical herbicides are used year after year, weeds have developed resistance, every year the herbicide is sprayed, no one cares about the effect, how the weeds should grow, or the same growth, so that the grass seeds on the stubble leave stubble, causing a vicious circle, so the herbicide is more and more, the weeds are still growing luxuriantly, don't believe in their own fields to see but so? As the saying goes, "when you cut the grass, you have to remove the roots", the herbicide you spray does not remove the roots, while manual or mechanical hoeing can remove the roots at one time, so there were few weeds in the past.
The second problem caused by the use of herbicides is the excessive pesticide residues, which are the residual sequelae of herbicides. Some herbicides used in wheat fields affect the next corn crop, and corn fields also affect wheat. I say whether this is the case or not, growers know best.
The third question, how many pesticide residues in the grain produced by wheat or corn that have used herbicides, there is no authoritative test result, so I will not discuss it here, but there is no artificial weeding, and the food security produced by no herbicides is assured. Therefore, from the perspective of food security, it is better to weed manually or mechanically.
Then again, let's talk about spring wheat weeding. Do you throw away the herbicide, pick up the hoe again or use a cultivator machine to weed, or continue to use the herbicide? The author believes that weeding should be done manually or mechanically. There are at least the following benefits: first, hoeing in early spring, fusing and loosening the soil, increasing soil porosity, accelerating the exchange with external gases, absorbing more solar heat energy and increasing ground temperature, promoting the growth of the root system, and making the wheat quickly turn green.
The second is through the hoeing of artificial machinery, while loosening the soil, cutting off the capillary tube after the evaporation of soil water, reducing the evaporation of water in the underlying soil, retaining water in the soil aggregate, and retaining water and resisting drought.
Through cultivating, destroy the places of germs, eggs, and adults lurking in the topsoil between wheat rows, and use sunlight, low temperature, and birds to kill diseases and insects, which is why it is said that hoes have medicine.
By cultivating and hoeing, the ground temperature can be increased to increase the oxygen content in the soil, so that the microbial activity is enhanced, the nutrients in the soil are decomposed, the soil fertility is improved, and the nutrient needs of wheat growth are promoted. This is the reason why hoes are fat.
Manual or mechanical weeding is not comparable to chemical weeding, and there are people there.
In the 70s and 80s, experiments were conducted, and early spring hoeing could increase the yield by more than 15.
If there is a lot of grass in the wheat field, it will not work, and it will compete with wheat for light, fertilizer and space, which will have a great impact on the growth of wheat. But in the current situation that time is money, the cost of man-hours is several times or even dozens of times higher than before, so it is not cost-effective to remove the grass manually, how to remove the weed? Then use mechanical weeding, labor efficiency, can save investment, and reduce pesticide residues.