水稻新品种吉农大3号的选育经过及高产栽培技术

The Primarily Studies of Successive Planting Tolerance and Its Heredity in Soybean

摘要:

水稻新品种吉农大3号，1995年经吉林省农作物品种审定委员会审定通过。该品种主要优点是优质、高产、抗病、适应性广等，2年累计推广面积已达16万hm²，深受广大稻农欢迎。

Abstract:

Sines 1985, our reserach group has carried out breeding program for Cyst Nemotode resistance in successive planting plots at the First Seed Farm of Tong Yu County. Nemotode resistancecultivars Jilin 23 and 32, and other four lines were developed one after another. The experiment alsoshowed that these cultivars and lines had strong successive planting tolerance. In one-year successiveplanting plot, the yield per plant and major agronomic traits, such as, plant height, pod number perplant, 100 seeds weight, were basically the same as in no successive planting plot. On the contrary, sixsuceessive lines showed significant decreases in yield perplant and major agronomic traits when plantedin one-year successive planting plot compared with those in no successive planting plot. Among the major agronomic traits, plant height can he used as the standard in the identifing and screeing for successive planting tolerance in soybean, on the basis of above experiment, two crosses were mad and geneticanalysis was condueted for the successive planting tolerance. The resuts indicated that successive planting tolerance belongs to quantitative charcter and F₂ directional selection showed that realized heritability for successive planting was high, suggesting that earlier generation selection be effective. This experiment suggeste that problems of successive planting stress can be reduced or prevented by selecting orbreeding plant genotypes with greater tolerance to it.