In the process of planting soybeans, farmers often encounter yellowing of soybean leaves and dwarfing of plants, which seriously affects soybean yield. What is the cause of yellowing and dead seedlings in soybean leaves? How to prevent it?
1, soybean top blight causes dead seedlings
Soybean seedlings are infected with top blight, brown ring spots appear on the cotyledons of seedlings, necrosis of growth points, and severe whole plants die; plants that are susceptible to the early flowering stage, the diseased plants are prolonged, the top buds become brown, and they are bent into hooks. The plants begin to become brittle and easy to fold; the plants that are susceptible to the disease from the late flowering stage to the blast stage are easy to fall, the stems and the pith of the branches are brown, the pods are small, the stunt is poor, and the pods are in the pods. Not full, often delayed maturity, until the harvest has been green.
Prevention:
(1) The plots where the spots occur should be removed.
(2) When it is confirmed that the soybean top blight is infected, it should be sprayed with 64% antivirus cockroach 600 times liquid or 75% chlorothalonil 600 times liquid in time.
2, soybean cyst nematode caused dead seedlings
2, soybean cyst nematode caused dead seedlings
Soybean cyst nematode damage occurred in soybean seedling stage, cotyledons and true leaves turned yellow, developmental retardation, and the whole plant died in severe cases; soybean cyst nematode harmed in the adult stage, the plant dwarfed, the leaves turned yellow from bottom to top, and the flowering period was delayed. Pod pods but the seeds are not full and the color is darker. When the diseased plant was pulled out, it was found that the root system was underdeveloped, the roots were many, and the nodules were few. The roots were attached with many cyst nematodes (small yellow granules in shape).
Prevention:
(1) Adding organic fertilizer. Promote healthy growth of soybeans by increasing soil fertility.
(2) Watering at the right time to increase soil moisture. Soil drought is beneficial to the damage of soybean cyst nematodes.
(3) Applying 40% of omethoate 1000 times solution to the base of the stem of the plant in time for the diseased field.
3, bean stalk fly disease
It mainly occurs in the application of soybean fields or heavy land with more than fully decomposed organic fertilizer. Soybean seedlings were characterized by normal leaves in the lower part of the plant and yellowing of the upper leaves. Peeling the rhizome, the stalk flies and sputum can be seen in the stalk. Control measures: Spray 40% of omethoate or phoxim 1000 times in the seedling stage and flowering stage.
4, nutritional disorders
Nutritional disorders mainly occur in the lack of fertilizer fields, or partial application, single application of a chemical fertilizer plot, or severely dry plots. Soybean plants have different degrees of leaf yellowing, shrinkage, and growth retardation.
Prevention:
Each mu of spraying Huimanfeng 50 ~ 80 ml plus potassium dihydrogen phosphate 100 grams of water 30 ~ 50 kg, can relieve or disappear symptoms, so that soybeans return to normal growth.
5, the herbicide residue of the upper mites
First, the herbicides in the wheat field were applied too late. Due to the low temperature in early spring, the chemical weeding time of some farmers in wheat fields was postponed until April 10. Due to the large grass age, the use of superstars and bensulfuron-methyl was increased accordingly, which increased by 0.5 to 1 times than the conventional dosage. Soil pesticide residues. Summer soybean sowing date is mostly from June 5th to 10th. The use period of superstars and bensulfuron-methyl is a safe period after 60 days of sowing of the next crop, so that the application time of the upper pot of some farmers does not reach the safety period until the planting period of the lower jaw, resulting in the occurrence of phytotoxicity.
Second, the use of A, chlorsulfuron and its compounding agent in wheat fields. The soil in Huaibei area is mostly neutral to alkali. A and chlorsulfuron are difficult to decompose in alkaline soil, which is easy to cause phytotoxicity to the lower crop. After using such herbicides in wheat fields, the lower sorghum soybeans are weaker and stiffer, and the weight is not able to stand on the seedlings, so that the yield is reduced by about 80%. Although such pesticides have been banned, the resulting phytotoxicity has been repeated due to the fact that the pesticide market still sells.
Prevention:
After the phytotoxicity is found, water is sprayed in time, and foliar fertilizer or plant growth regulator is sprayed.
More pesticide encyclopedia, please pay attention to China Pesticide Network
(Source: Good Agricultural Resources Network)
Protein covers a percentage of 55 to 60 in Corn Gluten Meal, other contents are amino acid, various vitamin and micro-element.It's a kind of good feed purified additive for poultry and live stocks growing and disease-resistant. Furthermore, it can also be used to extract natural pigment and various amino acid.usually called corn_coloring element and widely used in industries. With high protein, they are widely used in feeds industry, especialin shrimp breed aquatics , shrimps are grown well with this supplement.It's a kind of good feed purified additive for poultry and livestocks growing and disease-resistant. Furthermore,it can also be used to extract natural pigment and various amino acid.
Corn Gluten Meal,High Protein Corn Gluten,Corn Gluten Meal 60,Cgm 60
MIDI FEED BIOTECH LIMITED , https://www.chinabromine.com