Shennong 6 (soybean)

[basic situation] Shennong 6 (original serial number Shennong 91-44) was selected by Department of Agronomy of Shenyang Agricultural University in 1986 with Fengjiao 66-12 as female parent and Kaiyu 8 as male parent. Since Shennong 6 was introduced to Pulandian City in 1996, it has been tested by different years and different climatic conditions (low temperature, low light, high temperature and drought). It has shown high yield, stable yield, disease resistance and lodging resistance, with an average increase of 18.7% to 24.7% higher than that of the control. in order to give full play to the excellent species character of Shennong 6, we summed up the high yield cultivation techniques of large area yield 3375kg/hm2 of Shennong 6 through experiment and demonstration. And it was widely popularized in production, which made the extension area of Shennong 6 soybean expand rapidly in a short time. At present, Shennong 6 has become the main soybean variety in Pulandian area, which has produced obvious social and economic benefits.

[characteristics] Shennong 6 is a variety with limited podding habit, with plant height 90~100cm, stout stem, 20 nodes of main stem and 3 branches. Shennong 6 has the characteristics of apical long inflorescence and short fruit correction, and the apical inflorescence is as long as 11cm.

The flowering stage of Shennong 6 was relatively late, the initial flowering stage was from July 15 to 20 in Dalian area, and the final flowering stage was about 30 days on August 15, which was more concentrated. There were many pods, with an average of 50 pods per plant, with a maximum of 157 pods and 320 pods per plant.

It is more resistant to soybean virus disease, drought and barren resistance, lodging resistance, good photosynthetic performance in the later stage, and the living stalk is mature. The grain is yellow, light navel, the average grain difference is small, there is no purple spot, brown spot, the insect feeding rate is low, the 100-grain weight is 22 ~ 24g. The protein content is 45.5%, the fat content is 18.9%, and the total egg fat is 64.4%. Belongs to the double high variety, the quality is excellent.

The growth period of spring sowing in Dalian is about 130 days and that of summer sowing is about 90 days. In 1998, Shennong No. 6 soybean was planted in Pulandian City, Wafangdian City and Jinzhou District respectively. Jiang Chuanhai, Yuantai Town, Dadian Village, Pulandian City, planted 3.3hm2 in the open space of peach trees, the average yield was 3375kg/hm2, 0.7hm2 was planted in Miaopu Village, Fuzhou Town, Wafangdian City, with an average yield of 3900 kg / hm ~ 2, and 6.7hm2 was planted in Dengshahe, Jinzhou District, with an average yield of 3645kg/hm2. 0.2hm2 is planted in Liujia Village, Taiping Township, Pulandian City, and the average yield is 405Okg/hm2.

The Science and Technology Commission of Pulandian set up a project to promote the new soybean variety Shennong 6 and demonstrated the planting of 66.7hm2 in 27 townships. Among them, there are flat and fertile land, thin land, mountain root land, but also water to dry land, which basically represents various soil types and farming levels in this area. According to the measured yield, the output is basically above 300Okg/hm2, and the output of some plots is about 3375kg/hm2.

[breeder] Department of Agronomy, Shenyang Agricultural University

[region and technology] after several years of experiment, demonstration and production practice, we summed up the high-yield 3375kg/hm2 cultivation techniques of Shennong 6, as follows.

After getting rid of diseased spot grains, insect eating grains and impurities, seeds were mixed with 46% soybean seedling strengthening agent (medicine: seed is 1RU 120) or 25 grams of multiple coating agents (medicine: seed is 1:60) to control underground pests and so on.

Choose non-stubble plots for continuous planting. Flat fertilizer land (corn yield 900Okg/hm2 in the previous crop, application of rotten organic fertilizer 7500kg/hm2, but no seed fertilizer), medium fertility plot (former maize yield 6000~900Okg/hm2, application of rotten organic fertilizer 1500Okg/hm2, diammonium 150kg/hm2, potassium sulfate 150kg/hm2 (or biological potassium 15kg/hm2) as seed fertilizer, low fertility plot (previous corn yield below 600Okg/hm2), application of rotten mature organic fertilizer 22500kg/hm2, diammonium 225kg/hm2, potassium sulfate 180kg/hm2 as seed fertilizer. If the growth is not enough, urea 45~75kg/hm2 will be applied at the early flowering stage of soybean.

Shennong No. 6 should be sowed late in order to reduce the height of Demo, and the best sowing date in Dalian is from May 10 to May 15. The suitable sowing amount in spring is about 52.5kg/hm2, and that in summer is about 112.5kg/hm2. After equidistant hole sowing, 3 seeds were planted in each hole, and the depth of soil cover was 3~5cm after sowing. The number of seedlings retained in spring sowing field was 150000 plants / hm2, that is, row spacing 57cm, hole spacing 23cm, 2 seedlings per hole, high fertility plot, 120000 seedlings / hm2; summer sowing field seedlings 375000 ~ 450000 plants / hm2.

After the two opposite true leaves were unfolded to the first compound leaf, the artificial hand seedlings were carried out according to the required hole distance, and the weak, small and diseased seedlings were removed and fixed at one time.

Three shovels were completed three times before the soybean ridge was sealed, with an interval of 10 to 15 days.

Before emergence after sowing, 20% 60g/hm2 was mixed with Acetochlor 2250kg/hm2, water 750kg was sprayed on the soil surface to control weeds. The plots in summer sowing soybean field with Magnolia mandshurica as the main weed can be killed by Jing Gao Ke or Jing Shang. The dosage of 750~1500ml/hm2 and 450kg to water were sprayed on the stems and leaves of the weeds at the stage of 3 ~ 5 leaves.

(1) Control of soybean aphids: from the middle and last ten days of May to the first and middle of July, 750g 40% dimethoate EC was evenly mixed into 150kg wet fine sand and sprinkled every 6 to 8 rows. Or use 40% dimethoate emulsion 1500-2000 times liquid spray, the amount of liquid 450~600kg/hm2. (2) Prevention and control of soybean heart borer: in mid-August, linoleum soft paper was dipped in 80% dichlorvos EC to make "sustained-release cards". The dosage of 1500g/hm2, 750 sustained-release cards were hung evenly in the field. Or soak 900-1050 corn cobs with 80% dichlorvos EC and 2250g/hm2, and distribute the field evenly. (3) Prevention and control of soybean Yuansizi: in the area where soybean Yuansizi is prone to occur, 40% dromethamine EC 100,150 times can be used, the dosage of 300~450kg/hm2, after the fourth compound leaf of soybean (before that, it is easy to cause drug damage), and sprayed on the soybean plant when it is harmful to transplant.

Shennong No. 6 concentrated in florescence, encountered drought in the flowering and podding period, and lost a lot of yield, so in the conditional areas, it is necessary to irrigate in time to ensure the yield.