Improved Soybean Variety-- Guizao 2 (original code: 199)

Variety approval No.: Guiyindou 2004001

Breeding unit: Institute of Economic crops, Guangxi Academy of Agricultural Sciences

Variety source: selected from Guangxi farm variety "Lacheng soybeans".

Institute of Economic crops, Guangxi Academy of Agricultural Sciences

Characteristics: the variety belongs to limited podding type, erect, plant type convergence, spring sowing growth period of about 98 days, general plant height 59.1cm, main stem 13.3 nodes, branches 2.4, white flowers, gray hairs, mature pods light brown, good defoliation, non-cracking pods, the number of pods per plant is about 28.5, the number of seeds per plant is 56.1, grain weight per plant is 8.7g, 100-grain weight is 16.5g, purple spot rate is 2.8%. The seed is oval, the seed coat is yellow and glossy, the appearance quality is good, and the navel is light brown. The grain protein content is 42.48% and the fat content is 19.59%.

Yield performance: participated in the spring soybean experiment in the autonomous region from 2000 to 2002, the average yield per mu of three crops in three years was 149.51kg, which was 6.5% higher than that of the control variety Liudou 1 (not significant).

The main points of cultivation techniques are as follows: spring seeds are sown from the end of February to early March, and autumn seeds are sown from the end of July to early August. When purebred, the density of plots with better water and fertilizer conditions is 2.0-25000 plants / mu, and the density of lean land can increase to 30, 000 plants / mu. When sowing, 300-500kg organic fertilizer per mu was applied as base fertilizer, compound fertilizer 10kg per mu as seedling fertilizer at the first compound leaf stage, and topdressing according to the growth at flowering and pod stage. The whole growth process, ploughing and weeding twice, combined with topdressing and soil cultivation.

Intercropping: 1 row of sugarcane, corn, cassava and other high-stem crops can be planted between rows, and can be planted in a strip in young orchards, sowing time as early as possible, sowing when the temperature is stable at 12 ℃, and timely management after emergence. The amount of fertilizer application is less than that of purebred varieties. The leaves turn yellow and begin to be harvested in time when the leaves fall, so as to facilitate the growth and field management of the main crops.

Autonomous region quality Review Committee approval opinion: after examination, this variety meets the soybean variety approval standard of Guangxi, and can be planted in soybean production areas in the whole region, especially in arid and barren areas, but attention should be paid to the prevention and control of downy mildew and purple spot.