Lotus root has a long history of cultivation in China. It is a perennial aquatic herb of Nymphaeaceae and one of the most popular vegetables. In the early stage of lotus root growth, the water layer in the field is relatively shallow, which is conducive to the occurrence of weeds, and there are many types and quantities of weeds. In the late and middle stages of the growth of lotus root, the water layer in the field is deep, and the lotus root plants are tall, the lines are sealed early, and the degree of field canopy closure is high. It is not conducive to weeds and occurs lightly. The grassy facies and occurrence degree of different types of plots are different. The shallow water pupae are mainly wet and weedy grasses, and the deep water pupae are mainly aquatic weeds; the weeds in new plowing fields are light, and the weeds in paddy fields are heavy (Figure 17). -161).
Because of its special growth environment (aquatic), coupled with its rapid growth, high plant height, early line closure, and high field canopy closure, lotus root is difficult to carry out weeding operations in its late growth stage. Therefore, in the large-scale prevention and control work, we should adhere to the "based on agricultural measures, control of pesticides as the focus, control after pressure, and control grass with grasshoppers" strategy, and control the grass to ensure that the damage caused by grass damage is minimized. limit.
Agricultural control measures are an important method of weeding in lotus fields. In places where conditions permit, regular implementation of paddy crop rotation can significantly reduce weeds; control water to suffocate weeds, in the early stage of lotus root planting, irrigation depth 2 to 3cm, when lotus leaves 2 to 3 pieces, irrigation depth can be increased to 10 ~ 16cm, keep the deep water for 4 to 5 days, can kill most of the weed seedlings; for the large weeds that have grown out of the water, after the artificial removal of the soil immediately after stepping on the manure; at the same time eradicate the field weeds.
Chemical weed control can effectively control all kinds of weeds. Production should be combined with the management characteristics of lotus root in a timely manner to control herbicides, seedlings planted 3 to 7 days after planting, to maintain a shallow layer of 3 ~ 5cm, in order to facilitate the increase in ground temperature, and promote the bud sprouting long. With the growth of plants and the formation of branches, the water layer is gradually maintained at 7 ~ 12cm, to the summer high temperature season, the water layer maintains 20 ~ 30cm, after entering the scarring period to maintain a shallow layer of 12 ~ 15cm, in order to facilitate the formation of And promote the rapid growth of lotus root.
In general, the new lotus field transplanted in that year can be applied to the lotus seed 7 to 10 days after the application of herbicides. At this time, most of the weeds in lotus fields begin to germinate. After application, they can not only kill the germinating weeds, but also cause the germination of late weeds. Play a role in inhibition, so that the early days of the lotus field will not suffer the damage of weeds.
After lotus roots are planted for 7 to 10 days, when the water temperature is stable above 20°C, 50% Prafulafil WP can be used 40 to 50g/mu, or 60% butachlor EC 75 to 100ml/mu, 12% oxalone EC 125 ~150ml/mu, applied to the weeds before they germinate, and mixed the granular toxic soil with fine soil and evenly spread it on the field surface to keep the water layer 3~5cm deep. The effect can be seen in 5~7 days. We must pay attention to three points when using chemical weeding: First, it is not suitable for spraying on rainy days; second, no spraying when the water temperature is lower than 20°C; and third, it is not suitable for string irrigation between fields after spraying to prevent phytotoxicity. However, because lotus root is in the aquatic environment, the water layer is generally deeper, and the herbicidal effect of herbicides is often difficult to ensure. The screening of novel herbicides needs further study.
When more grassy weeds occur, such as lotus roots, rushes, and thousand-gold, weeds and muddy waters are sowed in the 3 to 4 leaf stage of weeds. The following herbicides are applied:
10% refined quizalofop EC 40~80ml/mu;
15% fluazifop-mercury EC 50 ~ 100ml/mu;
12.5% ​​dilute acridine engine oil emulsion 50 ~ 100ml/mu;
10.5% high-efficiency fluphanopyrimidine EC 20~50ml/mu;
Spraying 50kg of water, weeds gradually died after 3 to 4 days. Normal water management later.
According to data, 20% isopropyl benzyl WP (a combination of metolachlor and bensulfuron-methyl) is better as a herbicide for the field of lotus fields. Prunus edulis, Porceus edodes, Alias ​​sedges, Bovine Felt, Houttuynia, Hymenoptera, Nobile, Terex, Tetrahyda, Wolfweed, etc. Control and inhibition. The drug not only has the double effect of pre-emergence weed control and post-emergence weed control, but also has a broad spectrum of herbicides; it is relatively safe for lotus roots.
Fruits And Vegetables,Fresh Fruits And Vegetables,Fresh Fruit And Veggies,Fresh Vegetables
Xi'an Gawen Biotechnology Co., Ltd , https://www.seoagolyn.com