Rape Spring Field Management Technology
Clear trench drainage. There are more rains in the spring in our province. Waterlogging not only seriously affects the normal growth and development of rape, but also easily causes the occurrence and prevalence of diseases such as Sclerotinia. Therefore, spring should pay particular attention to the drainage of rapeseed in Tianqinggou, especially in the cold-water immersed fields in the mountainous areas and some blocks with poor drainage.
Spray boron fertilizer. In our province, the soil is generally deficient in boron, and the lack of boron in rape can lead to flowering and flowering, so pay attention to the application of boron fertilizer. There are three ways to apply boron: bottom dressing, top dressing or foliar spray. For the application of boron-free fertilizer, foliar spraying was conducted during bud stage and initial flowering stage; boron was severely deficient in soil and boron fertilizer was not applied at the end of the crop. Spraying boron fertilizer generally uses 100 grams of borax per acre. After being dissolved in warm water, the water is sprayed in an amount of about 50 kg.
Apply manure. In order to prevent late lodging and greediness, it is generally not advisable to apply fertilizer after the year. However, it is necessary to apply fertilizer in appropriate amounts to fields where wax fertilizer is insufficient, growth is poor and there is a trend of premature aging. For the large amount of wax fertilizer, the growing field will no longer apply manure. Feifei should be applied at a height of 7 to 10 centimeters. It should be sooner rather than later.
Remove old leaves. Rape plants during the flowering stage are tall, with poor ventilation in the lower part. In addition, there are more rains in the spring in the province, and the humidity in the field is relatively high, which is easy to cause diseases. Therefore, we must promptly remove the diseased, old, yellow leaves in the lower part of the body to prevent and reduce the occurrence of diseases such as Sclerotinia.
Prevent lodging. Hybrid rape plant tall, such as poor management in the previous period, excessive growth, or excessive fertilizer and later, will cause rape lodging. Especially in the Dongting Lake area, rape can be easily affected by the strong winds in spring and the rape can be deposited in large areas. After lodging the rape, it is also prone to flowering. In case of lodging of rapeseed, the plant should be straightened as far as possible, and some tree branches should be cut. The cotton area can be properly left in the field with some cotton stalks as a support. For high-humidity plots, attention should be paid to clearing trenches.
Sclerotinia. The type and dosage of the agent are: 40% sclerotium net wettable powder 1000 to 1500 times liquid 1 to 2 times, 50% carbendazim powder 500 times liquid 2 to 3 times, 20% methyltric tocopherol 1000 times liquid 1 to 1 2 times, 70% thiophanate-methyl wettable powder 500 to 1500 times 2 or 3 times. When the flowering rate of the main stem is more than 95% and the flowering rate of the primary branch is about 50%, the rate of the diseased plant is more than 10% and the rate of the stem disease is 1% or less. Spray 1 or 2 times, 7 to 10 days apart.
Control locusts. Pharmaceuticals: 40% Dimethoate EC or 40% omethoate 1000-2000X, 20% Quinson Pine 1000-1400X, 50% Xenon Mist WP 3000x, 40% Acetophos Emulsion 1500 times liquid, 2.5% enemy emulsion kill 3000 times liquid and so on. Aphid control can also be used to set yellow plates in rapeseed fields, trap and kill locusts, or use locust bees, grasshoppers, ladybugs, and hoppers for biological control.
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