Yudou 21 (soybean)

According to the principle of selection and breeding of excellent × superior parents, the new soybean variety Yudou 21 was bred by the Economic crops Research Institute of Henan Academy of Agricultural Sciences after 10 years and 11 generations of directional selection in 1986, with Yudou 10, a medium-maturing variety with large grain, high yield and disease resistance, as its female parent and Yudou 6, a multi-branched, dense pod, high quality and multi-resistant small grain variety as its male parent.

The growth period of Yudou 21 (Zhengshuangjiao 8603-1) is 105 days, which is a mid-mature variety. Limited podding habits, plant erect, plant height of about 80 cm, strong branching, generally 3-4, compact plant type. There are about 60 pods per plant, and each pod has 2-3 pods. Leaf-shaped oval, medium size. Young stems green, white flowers, gray pods. The seed coat is yellow, the grain is oval, the navel is light brown and the deciduous leaves are good. One hundred grains weigh about 18 grams and belong to small grain type. Identified by the Institute of Plant Protection of Henan Academy of Agricultural Sciences, Zheng Shuangjiao 8603-1 was resistant to mosaic virus, purple spot and anthracnose. In the provincial test from 1992 to 1994, the average annual mosaic virus disease of this variety was 0.15-0.6, and the grain rate of purple spot disease was 0.5%-1.7%. There is no anthrax, all belong to the resistant grade. According to the provincial test and production statistics for many years, the average lodging degree of Zhengshuangjiao 0-1 is 8603, which is a lodging-resistant variety. Zheng Shuangjiao 8603-1 showed high yield and good yield stability in all levels of yield tests from 1992 to 1995. A total of 59 points were tested, of which 50 points increased production and 9 points reduced production, accounting for 85% of the total test points. The average yield was 13.8% higher than that of the control, ranking first or second among the tested varieties. In 1992, the average yield per mu in Henan Province was 180.20 kg at 12:00, which was 14.90% higher than that of the control Yudou 2. It ranks second in the tested varieties. In 1993, the average yield per mu in the provincial regional test was 175.19 kg at 18:00, 14.18% higher than that of the control Yudou 8, ranking fourth among the tested varieties; from 1993 to 1994, the average yield per mu at 35 points in the provincial regional test was 178.12 kg, 16.18% higher than that of the control Yudou 8, and ranked second in the total evaluation. In 1995, the average yield per mu in Henan Province was 167.3 kg at 12:00, which was 5.9% higher than that of the control Yudou 8.

This variety is high in protein. According to the national soybean breeding regulations of the eighth five-year Plan, soybean varieties with protein content above 45% are high protein varieties. The total content of protein and fat is more than 63%. According to the seed test results of Zheng Shuangjiao 8603-1 in 1991, 1993 and 1994 by the Chinese Academy of Agricultural Sciences and the Agricultural products quality Supervision, Inspection and Test Center (Zhengzhou) of the Ministry of Agriculture, the protein content was 46.38%, 47.48% and 48.0%, respectively, with an average of 47.29%. It is 3.38 percentage points higher than 43.91% of Ke S Yudou 8. The fat content was 18.32%, 17.85% and 17.24% respectively, with an average of 17.8%. The total protein and fat content was 65.09% for 3 years.

Breeder Institute of Economic crops, Henan Academy of Agricultural Sciences

Regional and technical Yudou 21 is suitable for planting in Henan province, northern Jiangsu, northern Anhui and southwestern Shandong.

Cultivation rules:

1. The sowing date and sowing rate are suitable for the first and middle of June, and the sowing rate is 3.5-4kg per mu. Practice 0.5m or 0.4m equal row spacing, practice hand-to-hand seedlings, plant spacing 10cm 13.8cm, leaving seedlings 12000 ~ 15000 plants per mu. Wheat ridge interplanting can be sown on demand 10 days before wheat harvest. There were 5000 points in each business, and 2-3 seedlings were left in each hole.

two。 Scientific fertilization of this variety is not strict to the soil, the yield is prominent in the medium and above fertility land, and the yield per mu can reach more than 250 kg in the land with high water and fertilizer. To create a high yield, the application of calcium magnesium phosphate fertilizer 40-50 kg, or diammonium 40 kg per mu. Topdressing diammonium 10-15 kg in the early flowering stage can also be foliar sprayed with micro-fertilizer.

3. Strengthening field management, ploughing and weeding soybean for 2 or 3 times before ridge closure, timely prevention and control of insect pests, and watering in case of drought at flowering and pod stage are also important measures for high yield.