浙江省免耕小麦高产稳产的栽培技术分析     

张国平  陈明达 《浙江农业科学》1994,(1):11-13

本文在分析稻茬免耕小麦的生育特点和产量形成规律的基础上，提出了浙江省小麦高产稳产的栽培技术途径；适当压缩基础群体，控制群体发展规模，提高分蘖成穗率，扩大生育后期的养分吸收和干物质积累，防止早衰，提高单穗生产力。  相似文献   

怎样控制乳房炎致病菌     

Sear.  PM 王春明 《乳业科学与技术》1993,(1):17-20

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浅谈合理用油     

张国平  康秀江 《农机使用与维修》1992,(3):18-19

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影响啤酒大麦种子发芽整齐度的因素     

殷琛  张国平 《大麦与谷类科学》2001,(1):20-22

综述影响啤酒大麦种子发芽整齐度的因素 ,着重介绍了品种、籽粒整齐度 (包括粒重和粒位 )对发芽整齐度的影响 ,旨在为培育优质啤酒大麦提供借鉴。  相似文献   

人畜硒营养和土壤植物中硒存在状况的研究概述     

张国平 《世界农业》1993,(7):30-32

硒在地球上广泛分布,但含量差异十分悬殊。在富硒土壤上生长的植物,体内浓度可高达对人畜造成毒害。早在本世纪30年代初,就认识到动物的软化病、晕倒病和肝硬化病等与饲料中Se含量高有关。另一方面,饲料或饮水中Se含量过低,会引起人畜的血肌病等多种缺硒病,克山病、大骨节病等都与生态环境中Se缺乏有密切关系。1959年Sehwarz证明硒是动物的必要元素。  相似文献   

免深耕土壤调理剂在晚稻上的应用效果   总被引：6，自引：0，他引：6  

王月星  赵伟明  陈叶平  张国平  黄洪明 《作物研究》2006,20(2):114-115,118

通过免耕晚稻施免深耕土壤调理剂3kg／hm^2、不施免深耕土壤调理剂和翻耕晚稻3个处理田间试验，2005年在浙江绍兴等地研究了免深耕土壤调理剂对免耕晚稻生长发育和产量的影响。结果表明：免耕晚稻施用免深耕土壤调理剂．叶片叶绿素含量增加，光合作用增强，分蘖成穗率提高．穗粒结构改善．穗形大．每穗实粒数多，千粒重高．平均产量8433．8kg／hm^2，比不施免深耕土壤调理剂晚稻增产8．4％，比翻耕晚稻增产7．6％．每公顷纯收入分别增加971．27和1955．03元．投入产出比为1：2．4。  相似文献   

Cavitation and the interaction between macroscopic hydrophobic surfaces     

Christenson HK  Claesson PM 《Science (New York, N.Y.)》1988,239(4838):390-392

The interaction in water of neutral hydrocarbon and fluorocarbon surfaces, prepared by Langmuir-Blodgett deposition of surfactant monolayers, has been investigated. The attraction between these hydrophobic surfaces can be measured at separations of 70 to 90 nanometers and thus is of considerably greater range than previously found. Spontaneous cavitation occurred as soon as the fluorocarbon surfaces were brought into contact but occurred between the hydrocarbon surfaces only after separation from contact. The very long range forces measured are a consequence of the metastability of water films between macroscopic hydrophobic surfaces. Thus the hydrophobic interaction between macroscopic surfaces may not be related to water structure in the same way that the hydrophobic effect between nonpolar molecules is related to water structure.  相似文献   

Dynamic properties of molecularly thin liquid films     

Israelachvili JN  McGuiggan PM  Homola AM 《Science (New York, N.Y.)》1988,240(4849):189-191

An experimental technique is described for simultaneously measuring the static and dynamic interactions of very thin liquid films between two surfaces as they are moved normally or laterally relative to each other. Film thickness can be measured and controlled to 1 angstrom. Initial results are presented of the transition in the physical properties of liquid films only one molecular layer thick to thicker films whose properties are practically indistinguishable from the bulk. In particular, the results show that two molecularly smooth surfaces, when close together in simple liquids, slide (shear) past each other while separated by a discrete number of molecular layers, and that the frictional force is "quantized" with the number of layers.  相似文献   

William osler and comparative medicine   总被引：2，自引：2，他引：0       下载免费PDF全文

Teigen PM 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(10):400-405

During the last thirty years of the nineteenth century, comparative medicine deeply influenced veterinary education in Montreal, New York and Philadelphia. Of the many physicians and veterinarians involved in this movement, Sir William Osler has attracted the most biographical and historical attention. However, his contributions to comparative medicine have been characterized inexactly, partly because of his later prominence as a clinician and partly because little has been written about the history of veterinary education in Quebec.

Osler's teaching and research in comparative medicine as well as his efforts to promote a veterinary profession are described and set alongside the work of other physicians and veterinarians who were his contemporaries. As a result, Osler's contributions to comparative medicine are seen to be many and important but by no means unique. Other Quebec veterinarians, including Duncan McEachran, Orphyr Bruneau, Victor T. Daubigny and J.A. Couture, and such physicians as T. Wesley Mills and J. George Adami made as many, and in some cases greater, contributions to veterinary education in Quebec than did Osler. That they have not received the degree of recognition that Osler has received reveals Osler's ability to represent values and ideals and draws attention to some essential features of late nineteenth-century comparative medicine.

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Testing the serving capacity of beef bulls     

Packard PM 《New Zealand veterinary journal》1983,31(1-2):20

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