杂交水稻种子低温贮藏技术初探

由于杂交水稻种子生产经营上的许多不可控因素，种子企业常会遇到当年杂交水稻种子大量积压的情况。为使种子安全度过夏季和春未秋初这段高温时期，尽可能地保持好种子的播种品质，部分种子企业已相继修建起了杂交水稻种子低温冷藏库。本文拟通过人为控制低温库不同库温、入库种子不同含水量，探索出杂交水稻种子在不同冷藏条件下其发芽率和含水量的变化规律。为杂交水稻种子的低温贮藏选择合适的库温及恰当的入库含水量，同时也为科学安全贮藏杂交水稻种子提供理论依据。……     

istical perspective,

目前全国杂交水稻年种植面积 1 5 3 3万 hm2左右 ,约占水稻总面积的一半 ,而产量则占水稻总产的近 6 0 %。杂交水稻生产的高效和持续发展 ,在很大程度上取决于杂交水稻种子产业化。1　杂交水稻种子产业化的涵义杂交水稻种子产业化 ,就是将杂交水稻种子从品种 (组合 )选育到种子     

湖南:山区小县打造水稻制种大产业

<正>绥宁县委常委、副县长李玉贤从中华人民共和国农业部领回了"国家杂交水稻种子生产基地"的匾牌。这标志着绥宁县跻身全国杂交水稻种子生产品牌行列。该县是全国著名的杂交水稻种子生产大县,制种历史达37年。2013年全县杂交水稻制种面积达到7.3万亩,总产值近3亿元。制种规模为湖南省第一,产品远销二十多个国家和地区。2009年,袁隆平院士为绥宁县制种基地题词"中华杂交水稻制种第一县"。绥宁县是湘西南的一个山区小县。近年来,该县县委、县政府立足本地优势,把杂交水稻种子生产作为农村和农业工作的第一大富民工程来抓,先后编制了《绥宁县杂交水稻种子     

新形势下杂交水稻种子生产基地发展对策浅析

杂交水稻种子生产基地建设意义重大,优质种子是产品高产、高效的前提。首先分析了我国杂交水稻种子生产基地建设遵循的指导思想和原则,并在此基础上指出我国目前杂交水稻种子生产基地存在着审定不规范、监管难度大、技术提升难等问题,进而指出要想进一步提升种子生产基地建设,必须积极引进新品种、狠抓源头、完善基地基础设施建设等措施,以期促进我国杂交水稻种子生产基地的稳定发展。     

杂交水稻种子贮藏技术要点

杂交水稻是我国南方地区的第一大粮食作物,把握好杂交水稻种子贮藏关,对提高种子生产企业经济效益,解决制种丰产和歉收年矛盾,确保大田生产用种安全显得尤为重要.现根据我地实际情况,浅谈杂交水稻种子贮藏阶段应掌握的技术要点.     

杂交水稻种子质量控制技术

<正>种子质量是种子企业的生命,是决定种子生产、经营企业兴衰成败的关键因素,也是农户购种考虑的主要因素。因此,要控制好种子生产加工的各个环节,生产出合格的种子,保障用种农户的利益,提高种子生产、经营企业的利润。笔者通过总结20多年的工作经验,指出杂交水稻种子生产、加工过程中的质量控制及关键技术,确保杂交水稻种子质量。1杂交水稻种子质量内容及标准1.1种子质量内容种子纯度种子纯度是指种子经过当地正季(或     

在改革中探索种子生产经营发展的新路子──郫县种子公司试行“公司＋农户”生产经营模式的调查

在改革中探索种子生产经营发展的新路子──郸县种子公司试行“公司＋农户”生产经营模式的调查四川省种子站（成都６１００４１）柴玮四川省郫县是国家商品粮基地县和杂交水稻种子生产基地县。近两年，该县种子公司在四川种子行业中率先探索“公司＋农户”生产经营模式，...     

杂交水稻种子包装初探

随着《种子法》的实施，杂交水稻种子市场逐渐放开。呈现出经营杂交水稻种子的公司多、经营的杂交水稻种子品种多的竞争场面。杂交水稻种子对消费者、对经营企业、对生产企业来讲。和普通商品其本质是一样的，因此种子企业仍然要制定战略目标。做好市场定位，需要对种子产品做市场品牌经营和品牌包装，增强种子的市场竞争力。     

杂交水稻种子市场包装初探

随着<种子法>的实施,杂交水稻种子市场逐渐放开,呈现出经营杂交水稻种子的公司多、经营的杂交水稻种子品种多的竞争场面.杂交水稻种子对消费者、对经营企业、对生产企业来讲,和普通商品其本质是一样的,因此种子企业仍然要制定战略目标,做好市场定位,需要对种子产品做市场品牌经营和品牌包装,增强种子的市场竞争力.     

提高杂交水稻种子生产纯度技术探讨

杂交水稻种子纯度是种子质量纯度、净度、发芽率、水分四大因素中最重要的因素之一,直接影响杂种优势的发挥及农业生产的发展.因此,种子生产单位在进行杂交水稻种子生产时,必须对影响种子纯度的几大因素严格把关.     

Blood,timber, and the state in West Kalimantan,Indonesia

Abstract: West Kalimantan (West Borneo) has a history of violent communal conflict.¹ It also has extensive forests that have been looted for decades. The argument will be that these two are linked, but not by the grievances of the forest dwellers. Except in its first few days, the two main episodes of 1997 and 1999 were not driven mainly by grievances among marginal groups. Rather, explanations based on the ‘resource curse’ carry more weight. These focus attention on the contested nature of the state, rather than on rebellious activities of marginal groups. When state institutions were thrown into disarray by the sudden resignation of President Suharto in 1998, Dayak militants already close to state power rewrote the rules of local politics by demonstratively ‘cleansing’ certain areas of an unpopular immigrant minority. This theatrical manoeuvre impressed political rivals sufficiently to allow Dayaks to gain control over several timber‐rich districts, which had a thriving black economy. Malays later imitated these techniques to stem the tide.     

Helminth parasites of the digestive tract of the oystercatcher,Haematopus ostralegus,in the Wadden Sea,The Netherlands

The digestive tracts of 90 oystercatchers (equal numbers of males and females and of juveniles, subadults and adults) wintering in the Dutch Wadden Sea were examined for helminth parasites. The nematodes Capillaria sp. (36.7%) and Streptocara crassicauda (7.8%) were found in the stomach. Unidentified cestodes (76.7%) and the trematodes Psilostomum brevicolle (42.2%), Notocotylus sp. (81.1%), and unidentified gymnophallids (100%) were found in the intestine and caeca. Two birds were infected with Gymnophallidae only, while all other birds contained additional helminth species. Compared with subadult and adult birds, the juveniles had significantly more infections with Capillaria sp. and cestodes. Moreover, the juveniles were infected with a greater variety of species. No further relation was found between the presence of helminths or worm numbers and age groups or sexes of birds.     

Urbanization,interregional accessibility,and the decision to migrate

Trends in population and labor force growth in nonmetropolitan areas of the United States during the 1970s are analyzed. The authors investigate the relationships among migration behavior, urban accessibility, and externalities such as congestion that are associated with urban residence. "A model of the migration decision [is examined] that incorporates in an explicit fashion this proximity-centrality relationship. Estimates of the model are also discussed, with specific attention given to the relationship under question. In addition, the age selectivity of the relationship [is] examined. Insights on the nonmetropolitan reversal drawn from the model estimates are discussed in a third section, followed by concluding remarks."     

The inheritance of resistance to the blossom weevil, Anthonomus rubi, in the cultivated strawberry, Fragaria×ananassa

The objective of this research was to determine which strawberry germplasm could be used to combine late flowering with reduced susceptibility to the strawberry blossom weevil, Anthonomus rubi. Seven cultivars and three breeding lines were compared for their susceptibility to A. rubi, by introducing adult weevils onto detached inflorescences. No consistent differences were detected but this contradicted observations from field trials. Five late‐flowering strawberry genotypes were crossed in a half‐diallel programme and progeny were tested for their susceptibility to A. rubi by using detached inflorescences and in a field trial where plants were exposed to a natural infestation. There was good correspondence between the results from the two methods and heritable differences were detected in both experiments, with the additive genetic variance being the more important. The cultivars ‘Idea’ and ‘Alice’ were identified as promising parents for reduced susceptibility while progeny from ‘Sophie’ were most likely to be susceptible.     

Transport Costs,the New Economic Geography,and Rural Development

This paper explores land use conflicts between non-farm neighbors and farmers to illustrate the usefulness of the concepts of interdependence, rules, and property rights when doing rural development. Recognizing interdependence and its implications helps economic analysis focus on and understand the types of rules and institutions having the most influence on economic behavior, and thus identify policy alternatives. The resolution of land uses conflicts, for example, unavoidably changes the bundle of rights associated with land, and influences who can impose costs of whom; it makes a difference if a large farm has the right to produce odors, flies, or noise that reduces their neighbors' abilities to enjoy the neighbors' own land, or if instead, neighbors have the right to use their property without experiencing farm-produced odors, flies or noise the farm may be unable to use its own land for agriculture without being inconvenienced.     

Technical aspects of the breeding programme at the Cocoa Research Institute,Tafo, Ghana

The paper briefly reviews the objectives and methods of the breeding programme, and considers the reasons for and inplications of the decision to breed for varieties to be grown from seed. Hybrid vigour and incompatibility are discussed, and methods of preparing parents for subsequent hybridisation are considered, mention being made of efforts to obtain haploids or di-monoploids. Inter-specific hybridisation and polyploidy are mentioned.