共查询到19条相似文献,搜索用时 343 毫秒
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文章依据比较优势理论,运用规模优势指数、效率优势指数和综合比较优势指数法,对沈阳市2000~2005年种植业主要作物的比较优势进行了分析,其研究结果表明:沈阳市在水稻、小麦、玉米、大豆、蔬菜、水果等的种植上具有比较优势,而油料、棉花、甜菜、烟叶等不具有比较优势,并在此基础上提出了种植业结构调整的建议。 相似文献
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巴音郭楞蒙古自治州土地辽阔,气候条件好,资源丰富。全州拥有耕地面积16.83万公顷,主要有小麦、玉米、棉花、甜菜、水稻等农作物,农业人口58万。1997年全州农业总产值37.5亿元,农民人均收入1830元。近几年,巴州技术监督局始终围绕自治区、自治州的经济发展战略,认真贯彻自治区以经济效益为中心,以县(团)示范为基础,行业为 相似文献
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农作物与蔬菜间作套种有学问合理安排间作套种,能充分利用地力、光能、空间和时间,增加复种指数,提高单位面积产量。间套种时要注意如下几点。1.高杆要与矮杆套种,如玉米与西瓜等既能充分利用空间,合理利用光能,又不影响通风透光,互不影响、共同生长。2.生长期... 相似文献
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水稻苗床期间营养及生长素质对大田生长状况及产量有一定影响。在水稻苗床施用苗床肥可提高水稻大田生长期间生育进程,返青快,秧苗长势强,提高分蘖力,增强水稻抵抗各种病虫害能力,提高大田水稻光能利用率,增强有机物质积累。经试验、应用结果表明,苗床肥对水稻生长发育各项指标的提高和单产的增加有明显作用。本试验通过对生产水平一致的水稻田施用不同的苗床肥进行试验观察。 相似文献
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Using survey data from China, frontier production functions are estimated individually for crops of rice, wheat and corn. Technical efficiencies and their determinants are analyzed. The results suggest that one cannot be optimistic about the future of China's grain sector as the scope for output growth through input injection and efficiency gain is found to be quite limited. 相似文献
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This paper shows that a seemingly simple assumption – that agents use a rolling planning horizon – can reconcile the puzzling long run price dynamics of exhaustible resources such as oil, gas and metals. A rolling horizon has the effect of removing the scarcity consideration of resource owners when stocks are large. Hence, extraction will be non-decreasing and resource prices non-increasing for a long period of time and there will be no connection between the price growth and the interest rate – in line with the trends of a majority of exhaustible resources in the last century. A calibration of the model to the oil market yields a price which closely fits the gradually falling real oil price after WWII and the sharply increasing price after 1998. This suggests that, while long run scarcity was not an important parameter on the oil market in the 20th century, it has been important in shaping the oil price from around 1998 and onwards. 相似文献
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文章通过实证性研究验证了消费者产品知识对有机蔬菜的购买影响并得出了影响系数。研究结果表明,消费者主观认知对有机蔬菜购买行为有正向影响,而创新性有微弱的负向影响;信息收集、客观认知对有机蔬菜购买行为有正向影响,有机蔬菜的消费者对其价格并不敏感。此外文章还研究了消费者人口统计变量对有机蔬菜购买的影响,部分人口统计变量对有机蔬菜购买存在调节作用。 相似文献
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目的:研究纳米生物技术对玉米的增产效益,为纳米增效肥料的推广提供依据。方法:在不同地块实验小区内,设计不同的试验方案,按随机排列的方法,分别研究纳米碳增效肥料对玉米的增产效益。结果:结果表明,与普通肥料相比,70%纳米硝酸磷肥纳米增效肥料使玉米增产16.75%。结论:该试验是在粮食上的研究,开拓了纳米材料在肥料应用方面的新领域。 相似文献
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日本钵育摆栽机械超高产栽培试验研究 总被引:2,自引:0,他引:2
引进日本钵育摆栽机械、钵育配套播种机械及配套秧盘成套技术,应用优良品种进行不同品种、不同钵体摆栽规格,利用大区对比进行超高产栽培机械钵育技术研究,将解决水稻生育期生长期短,产量低,米质量不稳定的问题。2009年在八五六分公司水田试验站进行试验示范研究,产量突破750kg/667m~2以上。 相似文献
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Growth, development and natural resources: New evidence using a heterogeneous panel analysis 总被引:1,自引:0,他引:1
Tiago V. de V. Cavalcanti Kamiar Mohaddes Mehdi Raissi 《The Quarterly Review of Economics and Finance》2011,51(4):305-318
This paper explores whether natural resource abundance is a curse or a blessing. To do so, we firstly develop a theory consistent econometric model, in which we show that there is a long run relationship between real income, the investment rate, and the real value of oil production. Secondly, we investigate the long-run (level) impacts of natural resource abundance on domestic output as well as the short-run (growth) effects. Thirdly, we explicitly recognize that there is a substantial cross-sectional dependence and cross-country heterogeneity in our sample, which covers 53 oil exporting and importing countries with very different historical and institutional backgrounds, and adopt the non-stationary panel methodologies developed by Pesaran (2006) and Pedroni (2000) for estimation. Our results, using the real value of oil production, rent or reserves as a proxy for resource endowment, reveal that oil abundance has a positive effect on both income levels and economic growth. While we accept that oil rich countries could benefit more from their natural wealth by adopting growth and welfare enhancing policies and institutions, we challenge the common view that oil abundance affects economic growth negatively. 相似文献
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Seed diversity and soil preservation are the foundations of healthy agriculture. Over many generations, farmers have developed varieties of wheat, rice, corn, and other crops that are adapted to local growing conditions. Industrial-chemical agriculture has abandoned that local knowledge, replacing seed diversity with genetically uniform crops that require large doses of fertilizers and chemical poisons to survive. One way the United States exerted control over Iraq, starting in 2003, was to enable agribusiness to disrupt thousands of years of tradition by imposing industrial methods on the country where evidence of the earliest mass production of food was discovered. Thus, it seems that conquest of people goes hand in hand with conquest of soil. There is resistance to agribusiness around the world. In the United States, small farms and urban agriculture are not only providing healthy food but also reconnecting people who grow up in cities with the life of the soil. 相似文献