The summer solstice has already reached the end of the solar term. In addition, after the recent introduction of the Meiyu period in our province, the amount of rainfall has gradually increased. According to the current weather conditions and the growth of corn in our province, experts have put forward such a proposal for field management.
The planting situation of corn in our province is as follows: the planting began in early June and the basic planting has now been completed. At present, the summer maize in our province is in the stage of emergence to the 5-leaf stage. At this time, the corn is relatively sensitive to waterlogging, and the rainfall is large. If the water is over-saturated, buds and sprouts will be stained. Seriously, it will cause a decrease in yield and loss. The current rainfall should arouse the attention of farmers. Experts recommend that they must clear the Sangou and discharge the water out of the field. When preparing for the broadcast, the characteristics of the areas along the Huaihe River and the Huaihe River are more watery. It is suggested that everyone should adopt ridges and planting, which is more conducive to Discharge water from the field in time to reduce waterlogging; discharge water at the same time, apply 10 kg per mu of urea to raise the seedlings in time, avoid waiting until the seedlings bloom yellow and fertilize, or spray a little humic acid leaf. Fertilizer, which can promote the growth of roots and leaves. Because there is still a part of spring maize in our province, the spring corn is currently in the tasseling period, and the rainfall may be lopsided. During the taunting period, we must pick up the corn sticks in time and if it is not enough to pick up the corn sticks, the corn may bend upwards. The upwardly-growing corn stick can no longer hold it up, because the roots on the side of the lodging have already taken place. Instead of lifting it up, the root system will lose more. It is better to let it grow naturally. If some of the corn is in front of the jointing stage and the leaves are visible before the nine leaves, they can still recover natural growth without any special treatment. Diseases and pests management Maize Brown spot corn stalk rot Stalk rot After the rainfall, the temperature is higher and the humidity is higher. It is prone to fungal diseases. Especially after corn lodging, it is easier to squeeze each other to cause diseases. Maize growers can advance to the lodging of corn. Spray a little carbendazim to prevent it. Brown spot occurs in the leaves, leaf sheaths and stems of corn. It first occurs at the tip of the top leaf. The lesions are the most common at the junction of leaves and leaf sheaths, and the lines are often densely integrated. The first is yellow-brown multi-functional or red-brown spots, the lesions are Round or elliptical to linear, the leaf tissue near the uplift is often red, small lesions often come together, and when severe, several or even all lesions on the leaves are full of lesions, appearing larger brown on leaf sheaths and veins. spot. If a brown spot has occurred before, use triadimefon or tebuconazole in advance for control.
There are also stalk rots during corn planting. The stalks are mainly rotted near the ground and have rancid odor. Most of them are bacterial stalk rot. Stalk rot must be promptly treated with agricultural streptomycin. For pests, the damage is mainly caused by ground tigers and armyworms, and it can be controlled by using flumethrin. Stem and leaf weeding Stem and leaf weeding in corn fields is controlled during the period from the second leaf stage to the fifth leaf stage of the corn seedlings. At this time, the weeds are also in the 2 to 5 leaf stage. Herbicides are basically all formulated with nicosulfuron and atrazine. The effect is still good. Special reminders to avoid the use of organophosphorus pesticides in corn fields one week before and after using this herbicide, otherwise herbicide-prone Phytotoxicity. There are herbicides such as mesotrione and oxacimone, these effects are also available, but the price is slightly higher. The top dressing time in topdressing corn field is mainly before the big bell mouth, and the amount of fertilizer is decided according to the amount of base fertilizer. If the base fertilizer can use 80~100 pounds of land per acre, it is recommended to top-dress up about 30 pounds of nitrogen fertilizer (3:1:2). )) It is not recommended to top-dress fertilizer too early, if the early recovery will cause fertilizer loss, it will easily lead to prosperous growth.
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