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非生产期内不同橡胶苗生长比较研究 总被引:1,自引:1,他引:0
为了研究非生产期内不同砧木类型橡胶苗对橡胶树茎围生长和可开割率的影响,利用从同一批次苗木中按砧木大小及其胶乳分级后选出的4种袋装苗和籽苗芽接苗(袋装苗),进行大田非生产期内的生长比较研究。结果表明:在定植时5种袋装苗之间的接穗直径存在显著差异,至开割前各种苗木茎围差异不显著,小苗和随机苗具有相对较快的茎围增长速率;定植7年后随机苗的可开割率最低,但达到开割标准;所有苗木的茎围生长呈现出规律性的增长,均拟合同一线性方程。说明对橡胶苗木进行分级后定植,有利于提高橡胶树的可开割率,非生产期内橡胶幼树的茎围生长呈线性增长。 相似文献
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南疆发展红枣产业有着得天独厚的气候条件。我团于2002~2003年开始栽种枣树,枣树成活率较低。2004年改进栽植方法,35.2hm2枣成活率达到90%以上,枣苗当年生长高度50cm以上,取得枣树当年定植的良好效果。1苗木质量1.1枣苗质量是定植成活率主要因素一定要选择品种优良、品质纯正、根系完整、无机械损伤的1级苗木。优质枣苗,其营养物质贮存多、发芽快、缓苗时间短、定植成活率高。1.2植株选择植株粗壮,茎干挺直,地径粗度1cm以上,主侧根4条以上,须根多、损伤小;体内营养物质贮存多的无病虫苗木。1.3根系活力枣苗根毛是吸收营养及水分的主要部位,… 相似文献
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在不改变育苗区域、土壤条件、种子来源和采集时间及处理方法、播种时间、播种量、圃地整理等条件下,通过运用芽苗移栽的技术,与对照比较实现了鹅掌楸育苗苗木质量的大幅度提高,苗木Ⅰ、Ⅱ级苗木出圃量提高10个百分点以上,且苗木须根发达,苗木栽植成活率明显提高. 相似文献
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三、栽培技术 (一)定植 1.苗木目前我国切花月季苗木主要有以下几类: ①嫁接苗:这类苗根系发达,长势旺盛,成苗迅速,栽种3—5个月即可产花,故在切花生产中普遍采用。②扦插苗:成苗时间较长,且由于有些品种自生根系较差,一般长势不旺,在切花苗生产中较少采 相似文献
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青钱柳苗木质量分级初步研究 总被引:2,自引:0,他引:2
为掌握青钱柳苗木质量分级标准,为贵州青钱柳栽培主要产区苗木检验提供依据,调查了贵州黎平青钱柳育苗基地的一年生芽苗育苗主要生长指标,通过主要指标相关矩阵并进行指标间的相关性分析,提出以苗高和地径作为青钱柳苗木分级质量指标,分别采用逐步聚类和平均值±标准差2种方法开展了苗木分级,初步制定了1年生青钱柳芽苗培育苗木的苗木分级标准研究。其苗木分级标准为:Ⅰ级苗,HⅠ≥150cm、DⅠ≥1.00cm;Ⅱ级苗,150cmHⅡ≥100cm、1.00cmDⅡ≥0.65cm;Ⅲ级苗,HⅢ100cm、DⅢ0.65cm。 相似文献
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摘要:【目的】为八角莲资源的可持续利用提供基础和科学依据。【方法】对八角莲进行人工辅助授粉、人工补种。【结果】经人工辅助授粉,庙坝石人山、松丰对窝山、槐坪山的八角莲结实率分别由8.1%、5.0%、2.5%提高到73.4%、91.6%、30.0%;人工补种八角莲栽培苗、种子育苗、组培苗定植苗、组培苗,成活率依次为96.7%、93.3%、50.0%、15.0%;定植一年,根部增重依次为80%、86.2%、103%、120%。【结论】人工辅助授粉明显提高了野生八角莲的结实率;人工补种方式增加了八角莲的种群数量及种群内个体数。 相似文献
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介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
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香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。 相似文献
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Automobile comfort dynamic simulation is necessary when we predict and evaluate the comfort of a automobile or optimize performance of automobile. The nine DOF vibration model of automobile is established , which acts root mean square value of body in multiple work conditions as comfort evaluation indices. Based on the comfort simulation, the Hongyan 1160 is predicted in the way of comfort. The programmes can be used in many different automobiles . The computational result indicates that the model can simulate vibration of automobile truly. It is significant to research automobile comfort evaluation to optimize performance of automobile and comfort simulation .The computational program can be applied to optimize or simulate which has some reference value. 相似文献
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南瓜降糖功能及其系列食品加工技术 总被引:3,自引:0,他引:3
阐述了南瓜在糖尿病辅助治疗方面的功能特性,介绍了南瓜降糖主要制品南瓜全粉、南瓜脆片、南瓜果酱和南瓜肉汁的工艺流程和操作要点。 相似文献
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母猪繁殖障碍成因分析 总被引:3,自引:0,他引:3
繁殖障碍是导致母猪淘汰的最主要因素,直接造成母猪非生产天数延长,繁殖猪群生产效率降低,严重影响猪场的经济效益。本文作者对引起母猪繁殖障碍的多方面因素,包括营养因素(如饲养水平、饲料品质、断奶日龄)、环境因素(如温度、湿度、通风、光照)、疫病因素、生产技术及管理因素进行了详细阐述。 相似文献
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Applicability of molecular markers in the context of protection of new varieties of cucumber 总被引:2,自引:0,他引:2
G. P. Bernet S. Bramardi D. Calvache E. A. Carbonell M. J. Asins 《Plant Breeding》2003,122(2):146-152
The growing number of candidate varieties presented every year at each national Plant Variety Protection Office and their decreasing genetic variability forces strategies to be adopted that will reduce costs without losing rigour when deciding about the acceptance or rejection of a candidate variety. Molecular markers have been envisaged as a reliable tool to establish differences, but can molecular markers be used for assessing distinctness? A comparison between a molecular and a morphological characterization of 41 seed samples belonging to 36 cucumber varieties and including several external controls has been carried out to investigate the applicability of molecular markers in the context of distinctness, uniformity and stability (DUS) tests and the protection of new varieties. Both types of character indicate the same relationships among main groups, Dutch and Beth‐Alpha types, and Gerking and Slice types, the correlation between distance matrices being only 0.6489. Varieties considered uniform for morphological traits proved not to be so for molecular markers. Therefore, molecular characterization is not offering the same estimates of uniformity and relatedness between varieties as does morphological characterization. External controls were used to establish distinction limits with morphological and molecular dendrograms to focus on those varieties, which were suspiciously similar. The results with cucumber show that molecular identity could be used to assess any lack of distinctness and so corroborate the morphological assessment of candidate varieties. The morphological trait ‘type’ provides distinct characterization of varieties and the molecular characterization of candidate varieties could be used to design better field experiments to assess distinction within each group of morphological cucumber type. 相似文献