Soybean Field Herbicide Formula and Optimal Spraying Time

AbstractThe herbicide formula for soybean fields is: acetochlor 2kg + fomesafen 1.5kg + thifensulfuron-methyl 20g per mu. Herbicides can be applied after soybean sowing and before emergence, or as a post-emergence stem and leaf treatment at the 3-5 leaf stage of weeds. The pesticide should be sprayed evenly. Generally, it is suitable to apply herbicides on sunny or cloudy days, with no wind or a breeze below level 3, when the temperature is stable above 10°C, and when there is no dew on the leaf surface.

I. Herbicide Formula for Soybean Fields

Generally, acetochlor 2kg + fomesafen 1.5kg + thifensulfuron-methyl 20g per mu is used in combination, which can effectively control weeds in soybean fields.

II. When to Apply Herbicides in Soybean Fields

Herbicides can be applied after soybean sowing and before emergence, or as a stem and leaf treatment at the 3-5 leaf stage of weeds. The pesticide should be sprayed evenly. Generally, it is suitable to apply herbicides on sunny or cloudy days, with no wind or a breeze below level 3, when the temperature is stable above 10°C, and when there is no dew on the leaf surface.

III. Main Classification of Soybeans

1. Yellow soybean

Yellow soybean is a widely planted variety of soybean. Yellow soybeans are often used to make various soy products, brew soy sauce, and extract protein. The okara or coarsely ground powder is also often used as poultry and livestock feed.

2. Green soybean

(1) Green soybean is a soybean with a green seed coat. According to the color of its cotyledons, it can be divided into two types: green seed coat with green cotyledons and green seed coat with yellow cotyledons.

(2) Green soybeans are rich in unsaturated fatty acids and soybean lecithin, rich in anti-cancer components such as saponins, protease inhibitors, isoflavones, molybdenum, and selenium, and rich in protein and fiber. They are also one of the main food sources for the human body to obtain vitamin A, vitamin C, vitamin K, and vitamin B.

3. Black soybean

Black soybean is the black seed of the leguminous plant soybean, also known as ludou, black bean, etc. It is sweet in taste and neutral in nature. Black soybeans have the characteristics of high protein and low calories. The outer coat is black, and the inside is yellow or green.

4. Feed soybean

The seeds of feed soybeans are relatively small, flat and oblong-elliptical, with concave round dots on the two leaves. The seed coat is slightly glossy or non-glossy.

IV. Distribution Range of Soybeans

1. Soybean is native to China and is cultivated throughout China. It is also widely planted around the world. Soybean is one of China's important food crops, with a cultivation history of 5,000 years. It was called shu in ancient times, and Northeast China is the main production area.

2. Soybean prefers warmth. Seeds begin to germinate at 10-12°C. The optimal temperature for growth is 20-25°C, and the optimal temperature during the flowering and pod-setting period is 20-28°C. At low temperatures, pod setting is delayed. Below 14°C, it cannot flower. If the temperature is too high, the plant ends growth prematurely.

3. Seed germination requires relatively more water. During the flowering period, the soil moisture content is required to be 70%-80%, otherwise the flower bud abscission rate increases. Before flowering, soybean absorbs less than 15% of the total fertilizer uptake, while during the flowering and pod-setting period, it accounts for more than 80% of the total fertilizer uptake.