Integrated Control of Soybean "Fire Dragon Seedling"

The soybean area of Wudalianchi City in Heilongjiang Province is 950,000 mu, and the continuous cropping area is 930,000 mu, accounting for 97.8% of the soybean planting area. Through investigation, the occurrence area of soybean "fire dragon seedling" is about 96.5%, most of the yield reduction is between 20~50%, and some plots reach the end of production. It can be said that soybean continuous cropping area can not be controlled due to the influence of market economy, but the occurrence of soybean "fire dragon seedling" can be reduced through comprehensive control, so that soybean can achieve high and stable yield. The comprehensive control techniques of soybean "fire dragon seedling" are introduced as follows:

1. Rational crop rotation and ploughing

Although crop rotation is difficult to achieve in production practice, from the perspective of ecological balance, reasonable crop rotation can fully and reasonably utilize land, reduce the occurrence of soybean "fire dragon seedlings" and other diseases and insect pests, and also help eliminate associated weeds. Rational crop rotation can not only increase soybean yield, but also improve soybean quality. Therefore, soybean can obtain high quality and excellent price. Higher economic benefits are obtained. If crop rotation cannot be done, autumn ploughing or stubble breaking can be adopted, which can destroy the roots of soybean growth in the previous year, thus reducing the occurrence of soybean "fire dragon seedling".

II. Selection of disease-resistant varieties

According to production practice, different soybean varieties have different resistance to "Huolongyangzi". Heihe 1152 and Heihe 38 (127) are resistant to "Huolongyangzi" cultivated in Wudalianchi City. These high-quality soybean varieties can reduce the occurrence of soybean "fire dragon seedling", thus improving soybean yield and quality.

3. Soybean seed treatment

The most common method of soybean seed treatment is to apply soybean seed coating agent for soybean seed coating. Soybean seed coating agent has the following advantages: 1. It can control pests because soybean seed coating agent contains pesticides. 2. It can control some underground diseases of soybean (including soybean "fire dragon seedling"), because soybean seed coating contains thiram, carbendazim and other fungicides. 3, can provide trace elements for soybean growth, because excellent soybean seed coating contains boron, molybdenum, zinc and other trace elements for soybean growth. The application method of soybean seed coating agent is generally 1∶75. We commonly used high-quality soybean seed coating agent Jiamusi pesticide factory production of multi-fork seed coating; Qiqihar synthetic additives factory production of continuous crop Ke No. 2; Bayi Agricultural University production of seed coating. These high quality seed coating agents have good effect on controlling soybean "fire dragon seedling".

IV. Application of soybean continuous cropping agent

Soybean continuous cropping agent is a new technology to control soybean "fire dragon seedling" in recent years. It overcomes the shortcomings of short duration of soybean seed coating agent. It is also flexible in the use method, because soybean continuous cropping agent is mixed with fertilizer when it is used, and can effectively control all hazards caused by soybean continuous cropping after being applied to soil. We commonly use soybean continuous cropping agent as follows: soybean CBT continuous cropping agent, Nongdafeng continuous cropping agent, fire dragon enemy, etc.

V. Widely used soybean foliar fertilizer

We know that soybean continuous cropping has a series of effects on soybean growth, such as single consumption of nutrients, aggravation of diseases and insect pests, increase of harmful substances in soil, etc. It is very difficult to make soybean grow normally, whether it is soybean seedling stage or soybean flowering stage, soybean growth does not get enough nutrients. We applied soybean foliar fertilizer at seedling stage, flowering stage and pod setting stage, which could supplement the nutrient deficiency during soybean growth. More importantly, through leaf fertilizer supplement nutrients, can promote soybean growth, greatly improve soybean disease resistance, thus reducing the occurrence of soybean "fire dragon seedling". There is also a point for farmers to realize that due to continuous cropping of soybeans, soybean root diseases are aggravated, and it is difficult for soybean roots to absorb sufficient nutrients from the soil. Only by supplementing leaf fertilizer can soybeans obtain sufficient nutrients. Because soybean leaf fertilizer is absorbed from soybean leaf stomata, its absorption characteristics are less absorption, but quick effect. This requires us to spray less leaf fertilizer at a time, but to increase the number of leaf fertilizer sprays, it is best to spray more than three times in the whole growth period of soybeans, respectively in the seedling stage, flowering stage and pod setting stage of soybeans. It is worth reminding farmers that soybean foliar fertilizer is very chaotic in the current market. We must choose high-quality soybean leaf fertilizer. Through our production practice, we can see that there are better soybean leaf fertilizer: Gold 655, soybean CBT leaf fertilizer, Nongda Fengye fertilizer Taiyang God, etc. The application of these leaf fertilizers has played a great role in increasing soybean yield and income.

In short, in order to make soybean "fire dragon seedling" occur less or not, we should comprehensively use the above technologies to effectively control the occurrence of soybean "fire dragon seedling", can not use a single technology, if only one of the above technologies, can not achieve the desired effect. Only by comprehensively applying the technology of soybean "fire dragon seedling" can the occurrence of soybean "fire dragon seedling" be effectively controlled, so that soybean can have high and stable yield and obtain greater economic benefits.