Weeds and wheat are all plants. Herbicides have a limited selectivity. We must ensure that herbicides kill both weeds and wheat, and we must strictly control the amount of herbicides. We must not arbitrarily increase or decrease the amount of herbicides. The amount introduced in the manual sho…

I. Weaning is unreasonable

Farmers raise their pigs to take a weaning method and go on the market immediately after weaning. This makes the piglets have a mother-centered, cohabiting, and stable and comfortable living conditions suddenly changed. It is difficult to adjust to increa…