| Recently there are many problems, such as seeds and cultivate techniques, for forage maize planting under special ecological conditions of farm-animal husbandry region. The prolific and early combinations have high yield, nutritional value and good adaptability. In order to make full use of double-ear trait in the production of local forage maize, the ecological conditions of farm-animal husbandry region and the genetic, physiological and environmental elements affecting maize prolificacy are systematically analyzed in this thesis. Finally, a breeding and culture technical system of forage maize for farm-animal husbandry region is put forward centering on traits of high yield, double-ear and early maturation.Bashang area in north-west Hebei province beliongs to the typical farm-animal husbandry region, whose ecological character is small precipitation, low temperature and rich radiation. The studies on ecological adaptabilities of maize combinations were conducted in the cold upland of northwest Hebei province. The results showed that the high-yield combinations had better adaptabilities. They grew faster at low temperature during seedling stage. Their development courses were brought forward in favorable conditions furing boot stage, and their grain filling stages were longer. Meanwhile, in contrary to the results in Beijing area, the average values of double-ear ratio, ear fresh weight per plant and stem width were higher in the cold upland. It demonstrated that the ecological conditions of this area availed to increase the yield potential and feed quality of maize. The screening and variety testing experiments were conducted to obtained several excellent maize hybrids with traits of early maturation, double-ear, high yield and adaptability to the ecological conditions. The cultivation treatments were arranged with two prolific combinations Nongda 103 and Nongda 7. The results showed that the double-ear percent and fresh yield for the treatments of two row spaces (80+40cm) and basal organic fertilizer were higher than controls. But the treatment of plastic mulching was not effective as that.The "AD" genetic model and MINQUE (1) approaches were used to analyze the traits of double-ear, maturation and yield with 8 forage maize inbred lines and their FI crosses in four environments. The results showed that the additive and dominant effects and their interaction effects with environments are significant for the traits of double-ear silking and kernel bearing. The genetic effects controlling heading days are additive and environment interaction effect. The main genetic effect controlling silage yield is high (56.4%) , and the environment interaction effect is additive X environment interaction. Except silage yield, no traits have significant mean heterosis. And all the heterobeltiosis are negative. The correlation analysis showed that the correlation coefficients except that between silage yield and double-ear ratio are significant or high significant. Meanwhile, the genotypic values of inbred lines and FI crosses were estimated by the method of adjusted unbiased prediction.The studies on synchrony of differentiation, silking and kernel bearing between apical and sub-apical ear in forage maize were conducted in the cold upland of north-west Hebei province, where the maize prolificacy is enhanced. The results showed that the double-ear differentiation synchrony of prolifichybrid ND103 was distinct from that of non-prolific hybrid Kedan 6. The synchrony of double-ear differentiation, silking and kernel bearing was consistent for each of the two hybrids. In addition, the researches on 64 hybrids with different prolificacy demonstrated that there were significant positive relationships in double-ear synchrony between differentiation and silking, and between silking and kernel bearing. And according to their double-ear development synchrony, these hybrids were classified and their prolificacy was evaluated initially.The double-ear ratio and some other traits of maize materials with different prolificacy,...
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