There are obvious peaks of grass. According to the statistics of the past two years, the peak period of germination of weeds in shallow water fields was 10 to 20 days after planting, and the amount of grass weeds accounted for 60.3% to 69.5% of the total grass volume. Seen from the germination situation of various weeds, grassy weeds and sedges mainly occurred in 10 to 15 days after planting; broad-leaved weeds had two peaks, and the first peak was 15 to 20 after shallow water planting. In the day, grass yield accounted for 51.9% of the total grass volume, the second peak was 30 to 35 days after planting, and grass yield accounted for 36.5% of the total grass volume. The amount of occurrence is large. According to statistics, from the time of planting (from late April to early May) to the middle and late growth period (from late August to the end of September), the total germination of weeds ranges from 835 to 916 per square meter, including alfalfa grass, Qianjin, etc. Weeds accounted for 49.5% of the grass, sedges accounted for 10.9%, and broadleaf weeds such as water leeks and duckweed accounted for 36.1%. After 30 days of planting, the fresh weight of the weeds in the plots that were not removed was 5.03 kg per square meter, while the fresh weight of shallow water was only 1.65 kg per square meter, and the fresh weight of shallow water accounted for 32.8% of the fresh weight of weeds. There are many kinds of weeds. The weeds that occur in large amounts in shallow water fields and that are seriously harmful are grasses, thousands of gold, water leeks, duckweed, water peanuts, dwarf arrowheads, calabash and sedges. Water Distiller Price,Automatic Water Distiller,Veterinary Water Distiller,Stainless Steel Water Distiller ZHEJIANG FOMOS MEDICAL TECHNOLOGY CO.,LTD. , https://www.ifomos.com