Lotus root has a long history of cultivation in China. It is a perennial aquatic herb of the Nymphaeaceae family and is one of the main vegetables that people love. In the early stage of lotus root growth, the water layer in the field is shallow, which is conducive to the occurrence of weeds. There are many types and large numbers of weeds. In the middle and late growth stages of lotus roots, the water layer in the field is deep, and the lotus root plants are tall, the closure is early, and the field is closed. It is not conducive to the occurrence of weeds and occurs lightly. Different types of fields have different degrees of grass and their occurrence. Shallow water mites are mainly wet weeds, deep sorghum is mainly aquatic weeds; new sorghum weeds are light, and even weeds are heavy (Figure 17 -161).
Lotus root is difficult to carry out weeding work in the middle and late growth stages due to its special growth environment (aquatic), coupled with rapid growth, tall plants, early closure, and high degree of canopy closure in the field. Therefore, in the large-area control work, we should adhere to the strategy of “based on agricultural measures, focusing on chemical control, and controlling the grass before we press, to control the grass†to ensure the loss caused by grass damage is minimized. limit.
Agricultural control measures are an important method of weeding in lotus root fields. Where conditions permit, regular water and drought rotation can significantly reduce weeds; control water weeds and weeds, in the early stage of lotus root planting, the depth of irrigation is 2 ~ 3cm, when the lotus root leaves 2 to 3 pieces, the irrigation depth can be increased to 10 to 16cm, keep deep water for 4 to 5 days, can kill most weed seedlings; for large weeds that have grown out of the water, manually remove them and then step on the soil to make fertilizer; at the same time, remove the weeds.
Chemical weeding can effectively control various weeds. In the production, we must combine the management characteristics of lotus roots in time to take herbicides and control. After 3 to 7 days of planting, we maintain a shallow water layer of 3 to 5 cm to improve the ground temperature and promote the growth of axillary buds. With the growth of plants and the formation of branches, the water layer is gradually maintained at 7 to 12 cm. To the high temperature season in summer, the water layer is kept at 20 to 30 cm, and after entering the crusting period, a shallow water layer of 12 to 15 cm is maintained to facilitate crusting. And promote the rapid growth of lotus root.
In the new lotus field transplanted in the same year, the herbicide can be applied after 7-10 days under the lotus root. At this time, most of the weeds in the lotus field begin to germinate. After the application, not only can the weeds be killed, but also the weeds of the later weeds. It plays a role in suppression, so that the lotus field will not suffer from weeds in the early stage.
After 7-10 days of planting lotus root, when the water temperature is stable above 20 °C, 50% turf wet WP 40-50 g/mu, or 60% butachlor EC 75-100 ml/mu, 12% oxaloin emulsifiable concentrate 125 ~150ml / acre, apply the herb before the germination of the weeds, mix the fine soil with granulated toxic soil, evenly spread on the surface of the field, maintain the water layer of 3 ~ 5cm deep, about 5-7 days can see the results. There are three points to pay attention to when applying chemical weeding: one is not suitable for spraying on rainy days; the other is not applied when the water temperature is lower than 20 °C; the third is that it should not be irrigated between the fields after application, to prevent phytotoxicity. However, since lotus root is in an aquatic environment, the water layer is generally deep, and the herbicidal effect of herbicides is often difficult to ensure. The screening of new herbicides needs further study.
When there are many grass weeds such as lotus root grass and Qiangjin, the weeds are drained in the 3 to 4 leaf stage of weeds, and the following herbicides are applied:
10% fine quizalofol emulsifiable concentrate 40 ~ 80ml / acre;
15% refined flurazepam emulsifiable concentrate 50 ~ 100ml / acre;
12.5% ​​rare stilbene oil emulsion 50 ~ 100ml / acre;
10.5% high-efficiency flupirtine emulsifiable concentrate 20~50ml/mu;
Spraying 50 kg of water, 3 to 4 days of weeds gradually dying and dying. Normal water management later.
According to reports, 20% isopropyl bromide wettable powder (a compounding agent of metolachlor and bensulfuron-methyl) is better as a herbicide for lotus field, and the herbicide is applied to the lotus field, three Edge grass, eye dish, shaped sedge, cow felt, water sedge, firefly, squash, ragweed, four leaf ping, wolf and grass have good control effect, also have a certain effect on purple back Control and inhibition. The drug not only has the double-layer effect of pre-emergence weeding and post-emergence weeding, but also has a wide spectrum of herbicides; it is relatively safe for lotus root.
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