排序方式: 共有81条查询结果,搜索用时 15 毫秒
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梨枣又名大铃枣,脆枣等,在左权县马厩村麻有生家种植有20亩。据观察,该品种果实多数似梨形,大果为椭圆形或卵圆形,平均单果重35克,最大单果重55克,果皮较薄,赭红色.品质上等。果实9月中下旬成熟。梨枣树体矮化,适宜密植栽培;且早果、丰产、稳产,遇雨不裂果,是一个优良的中熟食品种,以下是主要裁培技术要点: 相似文献
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ZHAO Yong-guo Ofori Atta LU Chang-ming 《中国农业科学(英文版)》2009,8(8):931-938
The Brassica oilseed crops went through two major breeding bottlenecks during the introgression of genes for zero erucic acid and low glucosinolate content, respectively, which may lead to reduced genetic biodiversity of the crop. This study investigates the impact of these bottlenecks on the genetic diversity within and across European and Chinese winter B. rapa cultivars. We compared eight cultivars from Europe and China, representing three different seed qualities from three different breeding periods: (1) high erucic acid, high glucosinolates (++); (2) zero erucic acid, high glucosinolates(0+); (3) zero erucic acid, low glucosonolates (00, canola quality). Diversity was estimated on 32 plants per cultivar, with 16 simple sequence repeat (SSR) markers covering each of the B. rapa linkage groups. The analysis of molecular variance (AMOVA) showed that genetic variations within cultivars, across cultivars and across regions (Europe and China) were significant, with about 60% of the total variation within cultivars. There was a slight, but non-significant loss in genetic diversity within cultivars when comparing the three breeding periods as indicated by effective number of alleles (2.39, 2.23, and 1.99 for breeding periods 1, 2, and 3, respectively), Shannon information index (0.93, 0.90, 0.75), and expected heterozygosity (0.51, 0.49, 0.42). By cluster analysis (UPGMA dendrogram) and principal coordinate analysis, Chinese and European cultivars were clearly divided into two distinct groups. In conclusion, quality improvement did not significantly reduce the genetic diversity of European and Chinese B. rapa cultivars. 相似文献
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二棱大麦的产量构成特点及综合高产栽培技术的研究 总被引:2,自引:1,他引:1
实现啤酒大麦高产与优质的统一,除选用良种外,采用与之相宜的高产栽培技术是关键。自一九八六年以来.作者相继以湖北的主栽及推广品种(系)鄂啤一、二号、浙农大三号,80435等为对象,研究二棱大麦的产量构成特点及高产限制因子,在此基础上,对练合配套裁培技术进行了探讨,推荐出一套湖北地区亩产400公斤的优化农艺方案,并在实际生产及辅助性试验中进行了试验验证,证实该方案具有一定的可靠性。 相似文献
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洋桔梗切花栽培管理技术 总被引:4,自引:0,他引:4
洋桔梗(Eustoma russellianum)亦称草原龙胆,由于具花姿优美、花色淡雅、瓶插寿命较长等优点,近年国内切花市场的需求量以年均30%以上的速度急剧上升。 相似文献
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中粳稻新品种连粳7号高产裁培技术 总被引:1,自引:0,他引:1
连粳7号系连云港市黄淮农作物育种研究所2005年选育而成的一个集丰产、稳产、优质及综抗的迟熟中粳稻新品种。2010年3月通过江苏省农作物品种审定委员会审定并定名。审定编号为苏审稻201008。 相似文献