Preventive remedy measures for dead seedlings in cotton fields

The selection of disease-resistant varieties according to local conditions is the main way to solve the problem of dead seedlings caused by diseases. The cotton varieties promoted in production are broadly divided into two types. One type of disease resistance is stronger, and it is more common in diseased and seriously diseased areas. Strong production advantages, although the disease resistance ability of one class is poor, but in the general disease and mildly diseased areas with relatively strong disease resistance, the yield performance is better, so the disease should be selected in the seriously ill place where the dead seedlings are severe. Stronger varieties, but in mildly diseased and diseased areas, it is advisable to choose varieties with high yield performance, so as to obtain a balanced increase in yield, and the selection of varieties cannot be stereotyped.

Strictly control the amount of pre-emergence herbicides For the problems caused by excessive herbicide consumption and cumulative drug poisoning during the past few years, the first problem is to control the dosage and the second is to use drugs alternately. The dosage of trifluralin is 2-3, and the spraying should be uniform. The spray should not be sprayed, and the soil should be mixed in time after spraying. Acetochlor dosage, according to the content of active ingredients, in strict accordance with the amount of instructions, high organic matter content of the soil on the line, the organic matter content of the press line, the plastic film covering the cotton field to calculate the amount of area. Replacement of other pre-emergence herbicides such as DUR, BED, etc., has been used for continuous use.

Application of base fertilizer, fine soil preparation, adequate planting and planting in the next planting period. This is the four magic weapons for seriously cultivating strong seedlings and preventing dead seedlings. In the northern cotton area, the basic fertilizer is applied in spring to plow, and the average fertilizer should be 1-2 per acre. Fang, diammonium 20-25 kg, 15-20 kg of potassium fertilizer, urea 5-7.5 kg, after the cultivation of pouring water at the end of the water, pouring water after the flooding, security, watering time should be about half a month earlier, so not only conducive to conservation, increase temperature, at the same time Can achieve the virtual reality, enough to plant under the seed, and create good conditions for emergence and strong seedlings; Southern cotton in the fertilization should be at the end, chase and weight, combined with soil preparation for drainage in order to prevent debt, the distance between 1 - From 1.2 meters, single ridges are preferred, which is beneficial to air and light transmission. Cotton is a thermophilic crop, so planting should not be premature, especially in severely diseased areas. In the northern cotton region, when the 5 cm ground temperature stably passes 15C, the planting should be started. The farmer said, “10 days early, 5 days late, and 7 days emergence.”

This is also the reason. The time for cultivating seedlings in mulching film in the southern cotton area should be determined according to the planting pattern and transplanting time. The general principle seedling age should not exceed 30 days. One year of mature cultivation, seedlings in early April, transplanting in early May; wheat transplanting, seedlings in the middle and mid-April, transplanting in the middle and mid-May; rapeseed transplanting, seedling raising in late April, mid-late May Transplanting. Nutritional seedlings should be carefully selected for prevention measures such as the selection of disease-free soil, decomposing fertilizers, disinfecting seedbeds, and strengthening the management of seedbeds to prevent the emergence of tall seedlings.

Strengthen the field management after the emergence of a timely cultivator loose soil cultivating loose soil in the north warming and protecting the river, the south has a role in reducing moisture and stain, we must adhere to early cultivating, diligent cultivator, fine cultivator, to promote strong seedlings early hair, improve Dead seedlings ability. The second is to adhere to the principles of early seedlings and seedlings in the evening. This is very important for the more serious dead seedlings over the years. Early seedlings can increase the nutrient space of individual plants and prevent the spread of germs among the seedlings. Late seedlings can be effectively prevented. After the dead, the seedlings are cut off. The time of young seedlings should start from the seedlings and it should be divided into two times. Ding seedlings should be carried out after the onset of the early blight. After the emergence of plastic film cotton seedlings in a timely manner, especially in May especially easy to burn seedlings, can take the first hole to release the wind, and then put the seedlings approach.

Comprehensive prevention and control of diseases at the seedling stage The comprehensive prevention and control of the three diseases that caused serious death, tumbling and withering in the cotton field should be adhered to. The more effective preventive agents are grade A topiramate, carbendazim, potassium permanganate, mancozeb, fulvic acid, etc., and application should be carried out before onset.

In addition, spraying urea water before the onset of wilting, before the three leaves, and before the onset of withering in the early stage, the biological leaf regulator has the effect of preventing seedlings from seedlings.

Remedy after dead seedlings The above comprehensive measures can greatly ease and control the death of the cotton seedlings. Even if this happens every year to varying degrees, how to take remedial measures after the dead seedlings in the cotton field to achieve less or no reduction in production. Comprehensive experience should take the following measures: First, to stay two plants, in the time when the seedlings are short of seedlings in one or two heads to stay with the two plants, the second is to keep the leaves in the pruning so that the lack of seedlings space has been effectively supplemented; Transplanting, large-scale transplanting is a successful experience for many years, simple and easy to implement, no watering, no slow seedlings, no dead seedlings, large Taiwan transplants from 1-2 to 4-5 true leaves can be carried out The method is to dig a large pit according to the standards introduced in the shortage of seedlings, and then select a standard seedling in the dense seedlings of the cotton seedlings. The left digging will lift the seedlings and lift the seedlings to the excavated pits. Keep the soil around. The fourth is to strengthen the field management of seedling cotton fields and give full play to the potential of individual plants.

Medical Wound Plaster

Adhesive Wound Dressing,Medical Small Wound-Care Plaster,Medical Waterproof Transfusion Wound Plaster,Medical Elastic Adhesive Aid-Band

Surgimed Medical Supplies Co.,Ltd , https://www.surgimedcn.com