Kangxian No.2 (soybean)

Kangxian 2 is a cooperation between the Institute of Saline-Alkali crop breeding of Heilongjiang Academy of Agricultural Sciences and the Institute of Plant Protection of Chinese Academy of Agricultural Sciences. In 1982, Nenfeng 9 was used as the female parent and (Nenfeng lO × Frenklin) F2 as the male parent. The progenies were identified by continuous planting in soybean cyst nematode nursery, and combined with Nanfan plus generation, a new soybean variety with high resistance to soybean cyst nematode was selected by improved pedigree. Original code name: rich 8201-205.

The characteristics of this variety belong to infinite podding habit, plant height about 95cm, main stem 16-18 nodes, branches 1-2, round leaves, white flowers, gray hairs, mostly 3-positioned pods. Yellow grain, brown navel, 100 grains weigh about 18~2Og. Protein content is 38%, fat content is 20.54%. Race 3 and race 4 were highly resistant to soybean cyst nematode. Drought resistance, waterlogging resistance, salt and alkali resistance are strong. The growth period is about 120 days, and the active accumulated temperature is 2500 ℃.

From 1991 to 1994, regional trials of varieties were carried out in Anda, Dumeng, Lindian and Tailai in the west of Heilongjiang Province. the average yield of 130.82kg per mu at 21 points was 42.8% higher than that of the control variety Hefeng 25, which was 42.8% higher than that of the control variety Hefeng 25 in 1993 and 1994. The average yield per mu was 44.8% higher than that of the control Hefeng 25. The investigation showed that soybean cyst nematode disease occurred seriously in western Heilongjiang, and the harmful degree was aggravated by poor natural conditions such as salinity and drought. Hefeng 25 was not resistant to soybean cyst nematode. With it as control, Kangxian No. 2 increased yield (1%-138%) at all experimental sites, slightly increased yield in mild cases, and increased with the aggravation of the disease. From 1994 to 1995, production demonstrations of different previous crops (including continuous stubble) were carried out in western Heilongjiang, Baicheng and Daan in Jilin, Wulanhot, Zhalaite Banner and Chifeng in Inner Mongolia. the results showed that the yield of continuous cropping of Kangxian No. 2 was lower than that of normal rotation, and the yield was reduced by 2% and 7%. Generally, the yield per mu is about 150~200kg, and the highest 262.5kg.

Cultivator, Institute of Saline-Alkali crop breeding, Heilongjiang Academy of Agricultural Sciences, Institute of Plant Protection, Chinese Academy of Agricultural Sciences

Region and technology 1. Fine ground preparation. Soil preparation in autumn, deep ploughing, deep loosening or stirring ridges, prepare soil conditions for timely early sowing and strong seedlings. two。 adequate manuring. Base fertilizer: more than 1 ton of high-quality barnyard manure was applied in the previous crop or in combination with autumn soil preparation. Seed fertilizer: diammonium 10~15kg per mu, potassium fertilizer 5kg, seed 4~5cm or stratified deep application. Avoid the same position of seed and fertilizer, so as not to cause lack of seedlings and broken strips due to the harm of chemical fertilizer. 3. Timely early sowing: sowing in the western part of Heilongjiang in early May, about 15000 seedlings per mu, fertile land should be sparse. Kangxian No. 2 has developed root system and luxuriant plants, so don't be too dense. 4. Continuous cropping in nematode disease areas (including plots with serious yield reduction due to nematode damage): strengthen the control of major diseases and insect pests other than nematodes, such as root rot, root flies, heart-eating insects and so on. 5. Planting in low-lying saline-alkali land: deep turning (or deep loosening) ridging and sowing on the ridge can effectively reduce the harm of flooding and saline-alkali.

Scope of adaptation: the western part of three northeastern provinces and adjacent parts of Inner Mongolia are serious disease areas of soybean cyst nematode. According to the current identification results, most of the soybean cyst nematode populations belong to race 3, and Kangxian 2 can be applied. When the nematode disease areas with unknown physiological race types are ready to use this variety, physiological race identification or production demonstration must be carried out.