共查询到20条相似文献,搜索用时 718 毫秒
1.
2.
<正>采用大垄双行覆膜栽培技术是玉米制种的成功经验。从1998年开始在甘南县良种场进行覆膜制种,制种产量与未覆膜相比,成倍增产。大垄覆膜主要功能就是增温、保水、增产。选茬整地,改垄夹肥玉米的适应性较强,对土壤和轮作的要求不十分严格,从茬口的选择上,除甜菜茬、向日葵外均可种植,这两个作物的茬口属硬瘦茬,不适于种玉米。选地要选择排水良好,不积水的地块种植。要求做到伏秋整地,规方连 相似文献
3.
交三单交覆膜育苗移栽制种夺高产四川省内江市东兴区种子公司(641003)刘年亨我区杂交玉米交三单交(交S1×330)晚熟种,1994、1995两年均因授粉期高温影响,制种产量较低。为此,1996年起我们试用了地膜覆盖,早育苗,早移栽,抢伏旱前授粉,效... 相似文献
4.
5.
为了探究覆膜育苗移栽技术对鲜食玉米生长及鲜穗产量的影响,以覆膜直播为对照,分析比较了2种栽培方式对鲜食玉米出苗(成活)率、生育进程、株高、穗位高及穗部性状、鲜穗产量的影响。试验结果表明:覆膜育苗移栽的有效苗率较直播提高15.8%,且生育进程明显早于直播,鲜穗收获期提前;覆膜育苗移栽可使株高和穗位高降低,对穗长及鲜穗产量的影响不明显,但对秃尖的影响极显著。对鲜穗产量影响不明显的主要原因是覆膜育苗移栽使生育进程提前,有效灌浆期延长,百粒重增加。随着相关配套技术的应用,鲜食玉米覆膜育苗移栽技术在晋北高寒地区的优势突显,很好的推广这一技术将是该地区鲜食玉米产业发展的一次革命性突破。 相似文献
6.
覆盖地膜对玉米制种产量的作用王立华(吉林省通化市种子总站134001)地膜覆盖玉米杂交制种田(简称地膜制种)增产效益十分显著。我们在中单2号(mo17×330)制种田设覆膜与不覆膜(CK)试验区,获得覆膜区比对照提早成熟10天,种子产量(每亩281.... 相似文献
7.
覆膜方式对坡耕地春玉米产量、土壤水分和养分的影响 总被引:1,自引:0,他引:1
为了探讨覆膜对宁南山区坡耕地春玉米栽培的可行性,寻求合适的覆膜方式。在宁南山区坡耕地条件下,通过田间小区试验研究了裸地平作(CK)、垄沟不覆膜(NM)、垄沟全覆膜(WM)和垄沟半覆膜(HM)4个不同覆膜方式对春玉米产量、土壤水分和养分含量的影响。结果表明,相对于CK处理,WM和HM处理能显著提高春玉米产量,分别提高了65.4%和62.5%。WM和HM处理也能增加0~80 cm土壤含水量和储水能力,提高土壤氮磷钾速效养分含量,较好地维持土地生产力。综合考虑春玉米产量、土壤储水保水能力和土壤肥力维持等因素,在宁南山区坡耕地春玉米植种中,垄沟全覆膜和垄沟半覆膜都是较好的覆膜栽培措施。 相似文献
8.
9.
10.
1 覆膜制种的技术优势
根据黑龙江省气候特点和几年来的工作实践,采用覆膜制种技术具有很强的技术优势.首先,能有效的利用和增加积温.通过覆膜不但可保持土壤温度而且可以吸收太阳辐射的温度,使土壤温度急剧升高,为种子萌发和后期生长发育奠定了基础,覆膜制种较直播制种可增加有效积温200~250℃,较直播制种提前收获10d以上. 相似文献
11.
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
12.
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
13.
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
14.
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
15.
16.
17.
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
18.
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
19.
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