Weeding technique of Potato in Intertillage

In potato cultivation, loam with deep tillage layer, loose soil, good drainage and rich organic matter should be selected as far as possible. It is not suitable to choose the land with heavy soil, low-lying stagnant water and barren fertility. Corn stubble is the best choice, followed by soybean stubble. Must be 2 years without the use of chlorosulfuron, Pushter, atrazine and other herbicides with a long residual period. No matter which stubble is chosen, the previous stubble should be crushed or planed and removed from the field after the autumn harvest.

? 1. Weeding

One is to close and kill weeds. Before emergence after sowing, Metolachlor EC and azinone were mixed according to the instructions and sprayed evenly on the ridge surface, which could effectively control annual grasses and some annual broad-leaved weeds.

The second is weeding after seedling. Post-seedling weeding can be used to control Gramineae weeds by using herbicides such as dimethylethidine, high-efficiency cover grass energy, fine grass energy or emperor brand potato, and different agents should be used strictly according to the instructions.

? Second, intermediate ploughing

Combined with chemical weeding, we should do a good job of artificial control of broadleaf weeds and loosening soil. For the first time, when the emergence of potato seedlings is more than 90%, it is necessary to shovel deeply, mainly by weeding and raising temperature; the second time is carried out in the stage of plant emergence, so as to achieve fine shovel, mainly weeding; the third time is carried out in the early flowering stage of potato, with a shallow shovel, with the principle of not hurting the stolon, and wading to the ground in time after each shovel. Urea 150-225 kg / ha and potassium sulfate 75 kg / ha were applied twice. Potassium dihydrogen phosphate was sprayed once in the early stage of potato flowering, and expander was sprayed once according to the instructions in the early stage of potato expansion (full flowering stage).