共查询到20条相似文献，搜索用时 93 毫秒
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九江县棉田中黑盲蝽的发生危害及简易测报方法的研究 总被引：1，自引：0，他引：1
棉盲蝽是农田常见的重要害虫之一。危害棉花的盲蝽在我县发生的种类主要有绿盲蝽和中黑盲蝽两种。50年代末期以前,棉盲蝽发生较少,至70年代,盲蝽的危害逐渐加重,但危害尚不突出。进入80年代以后,棉盲蝽的危害日益加剧,已成为棉田常发性的必治害虫。究其原因,耕作制度的变化,是造成棉盲蝽 相似文献
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棉花是天津市宁河县主要经济作物,也是宁河县支柱产业。近几年种植面积都在2.0万~2.67万hm2,占全县耕地面积的60%~70%。2005年棉盲蝽中等偏重发生,个别地块大发生。本县棉盲蝽优势种群为绿盲蝽。由于抗虫棉的推广应用,棉田用药次数减少,棉盲蝽由过去的次要性害虫上升为主要性害虫,危害逐年加重。据调查,2005年7月下旬-8月上旬棉田落蕾落铃严重,主要是因棉盲蝽为害,一般地块减产20%~30%,严重地块减产50%以上。针对这一现状,笔者2005-2006年对棉盲蝽发生危害特点及重发原因进行了调查研究,制定出了一套防治棉盲蝽的综合技术措施。1发生及危害… 相似文献
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长江流域棉盲蝽防治的商榷 总被引：1，自引：1，他引：0
长江流域棉田的棉盲蝽主要是绿盲蝽、三点盲蝽、中黑盲蝽和赣盲蝽。随着抗虫棉品种的推广,化学防治次数减少,近年来棉盲蝽一般导致减产10%～20%,成为当地棉花害虫防治的主要对象,防治不及时的减产可达50%以上;而且水肥条件越好、生长越茂密的棉田发生越重。由于棉农对棉盲 相似文献
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江苏沿海棉区盲蝽象为害棉花幼铃消长规律 总被引：7，自引：0，他引：7
在不同长势棉田，定期定点系统调查棉株的开花结铃及棉盲蝽（中黑盲蝽和绿盲蝽）的发生数量动态变化，结果表明，棉株的开花结铃与棉田盲蝽数量的消长时期基本一致，棉花幼铃的受害率和盲蝽的发生量表现为同步增长，同时，棉铃受害率与脱落率呈正相关。观察棉铃受盲蝽为害后留下的的刺孔数得知，脱落棉铃的刺孔数明显较未脱落的为多，说明棉铃脱落和盲蝽为害程度有密切关系。在棉株生育过程中，７月２５日至８月２５日为最佳结铃期，亦是防治棉盲蝽和保护棉花产量与质量的关键时期。 相似文献
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棉花是开封市主要经济作物之一 ,常年播种面积 8万～ 1 0万公顷。近几年 ,开封市棉区盲蝽象发生危害逐年严重 ,特别是 2 0 0 3、2 0 0 4年连续两年大发生 ,成为阻碍开封市棉花发展的最主要害虫。1发生特点1 .1以苜蓿盲蝽为主多种盲蝽混合发生。据调查 ,开封市棉区盲蝽象的种类以苜蓿盲蝽为主 ,与中黑盲蝽、绿盲蝽和三点盲蝽混合发生 ,其中 ,苜蓿盲蝽占44.3% ,中黑盲蝽占 34.6% ,绿盲蝽占 1 5 .1 % ,三点盲蝽占 6.0 %。1 .2危害时间长 ,世代重叠严重。棉盲蝽因其种类不同 ,发生世代、迁入棉田的时间和危害高峰略有差异。三点盲蝽一年发生 3代… 相似文献
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Subramanian Senthilkannan Muthu Frency S. F. Ng Yi Li Patrick C. L. Hui Yueping Guo 《Fibers and Polymers》2013,14(10):1776-1781
This research article discusses the modelling and simulation results of carbon and eco-footprints of adult incontinence products. Four types of products are considered in this study: two types of diapers-commercial and new diapers and two types of pants-commercial and new type of pants. New types of diapers and pants were developed by our research team in the Institute of Textiles & Clothing of The Hong Kong Polytechnic University. Carbon and eco-footprints were modeled by using IPCC 2001 method (100 Years) and ecological footprint method (taken from Ecoinvent 2.0) of SIMAPRO 7.3.2 version of LCA software. Datasets from Ecoinvent database inbuilt with SIMAPRO software were used to build the life cycle scenarios. Life cycle scenarios of four types of incontinence products were built for the entire life cycle of products from cradle to grave stages. In this research study, the contribution analysis (hot-spots in the life cycle stages) of carbon and eco-footprints of each type of product under consideration are highlighted. From the modeling and simulation results, it was noticed that the new reusable pants created the lowest carbon and eco-footprints compared to its counterparts. New type of diaper created slightly higher carbon and eco-footprints compared to the commercial diaper type. From the process contribution analysis, it was found that the production and disposal of SAP, generation of electricity for polypropylene, production processes of cotton were the contributors of major impacts in the order of hierarchy. From this detailed LCA study, it was understood that if the new type of reusable pants will be used without disposable inserts, it can bring carbon and eco-footprints significantly down. 相似文献
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中国长绒棉研究与生产概况 总被引：4，自引：0，他引：4
该文采用国内外最新研究成果,简述了世界长绒棉主要生产国的研究与发展现状,重点阐述了中国长绒棉育种研究和发展简史及进展,还对中国长绒棉育种研究水平与其它国家进行了粗略比较,并根据育种家们的研究列出了近期中国长绒棉育种的具体指标。 相似文献
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Effect of machine washing on structural behavior of core spun cotton/spandex interlock fabrics made with high, medium and
low tightness factors has been investigated. Results are compared with those for similar fabrics knitted from 100 % cotton.
Structural behavior of cotton/spandex and cotton fabric samples was observed under full relaxation and washing treatments
up to 10th cycle. Based on these data, dimensional constants (U-values) were predicted under 95 % significance level. Higher
course and wale densities, stitch densities, dimensional constant values, linear and area dimensional shrinkages are reported
with cotton/spandex interlocks. After treatment levels, cotton/spandex showed the dimensional constants with lesser CV %.
With increasing fabric tightness, decreasing of length shrinkages and area shrinkages and increasing of width shrinkages are
reported in cotton/spandex interlock structures. Cotton/spandex interlocks showed longitudinally and highly deformed shapes
after treatments. Fabric tightness affects significantly on structural behavior of cotton/ spandex and cotton structures during
relaxation. 相似文献
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为了中国棉花流通现代物流的发展和物流服务的标准化建设,确保棉花经济的发展和安全。作者通过对棉花物流行业的调研,分析了中国棉花流通领域存在“棉花物流缺少统一管理和规范、棉花现代物流发展滞后、物流管理人员不足和专业人才匮乏、物流标准化基础研究不足、标准体系尚未形成”等现状,提出了“加强基础研究、提高企业物流标准化制订的参与程度、从供应链的角度构建棉花物流全流程标准体系”的现阶段适合棉花流通领域物流标准化建设的思路,并提出了“棉花仓储服务规范和运输服务规范”两个棉花物流标准化建设的重点领域。 相似文献
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本文就植物生长调节物质对棉花成铃、早熟及生长发育的影响，对增强棉花的抗逆性以及对棉花器官发育的影响等方面做了总结，并分析了这些研究结果在棉花生产中的实际意义。 相似文献
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《Journal of Crop Improvement》2013,27(2):229-239
Summary The agronomic and physiological response of cotton to deficient irrigation as well as its influence on yield quality was determined. Plant growth expressed as plant height and accumulation of fresh weight was significantly affected by water deficit. Nevertheless, neither seed cotton yield nor lint quality were decreased. Turgor pressure was maintained positive for the entire growth cycle. The relationship between growth and yield parameters is discussed. 相似文献