Seedlings out of the flush, must often pull weeds; growing period of fertilizer 2 times, tamping seedlings after fertilizer 1 time, to human and animal manure and water-based, can also be applied to sulfuric acid according to the second May-June fertilizer, the first withdrawal of grass ash or circle fertilizer and calcium superphosphate, after the application of ploughing gleaned to the soil, and the implementation of shallow irrigation, do not cut off the water drought.

Harvest in winter when the seedlings wither, cut off the withered stems and leaves, digging tubers, wash, sun to eighty percent flat, into a bamboo cage, hit to remove the roots and coarse skin, or peeled off the outer skin, sun or kang to the whole dry.

Spring and fall digging tubers, remove the stem and leaves and roots, peeled off the skin, washed the soil, dried in the sun, sliced spare.

Raw or vinegar roasted (100 kg of trigonelline, 30 kg of vinegar). Perennial marsh herb. Spring sprouting, seeds, rhizomes and tubers reproduction. Often born in low-lying, poorly drained paddy fields, ditches and swamps.

Prevention should take the combination of agronomic measures and chemical weed control.

(1) Agronomic measures include: first, the establishment of a smooth ground and ditch, good water retention, irrigation, rice production environment; second, the combination of seed treatment to remove the seeds of weeds, and combined with the cultivation of turning, land preparation, eliminating the weed seeds on the surface of the soil; third, the implementation of regular drought and flood crop rotation to reduce the occurrence of weeds; fourth, to improve the quality of the sowing, sowing full seedling to seedlings, the grass pressure.

(2) chemical weed control, most places use a one-time sealing, that is, 1-3 days after sowing (germination), mu with 40% "live green" wettable powder 60 grams of water 40-50 kilograms, evenly sprayed, applying medicine when the field board to keep wet. After 3 days, resume normal irrigation and field management. After the chemical removal, if there is still a certain amount of weeds in the late stage, you can take the target method to make up for the removal.

If the field is dominated by barnyard grass and Chijinzi, in the 3-5 leaf stage of the weeds, 10% Chijin emulsion 50 ml with 30 kg of water can be used to spray the stem and leaves with the target method. The field must be drained the day before the drug is used, and then return to normal management 2 days after the drug.

If the field is dominated by sedge and broadleaf weeds, about 30 days after sowing, mu with 10% Mercury wettable powder 20 grams plus 20% dimethyl tetrachloro water 150 ml mixed with 30 kilograms of water against the method of spraying. Water slurry management as above.

If all kinds of weeds *** birth in the field, can be used 48% benadryl water agent 75-100 ml plus 20% dimethyl tetrachloro water agent 150 ml mixed, using the target method of spraying.