The Performance of Agricultural Market Advisory Services in Corn and Soybeans

The purpose of this article is to evaluate the performance of market advisory services for the 1995–2003 corn and soybean crops. A new database from the Agricultural Market Advisory Services (AgMAS) Project is used in the evaluation. This database should not be subject to survivorship and hindsight biases. Overall, the results provide little evidence that advisory services as a group outperform market benchmarks, particularly after considering risk. The evidence is more positive versus the farmer benchmarks, even after taking risk into account. Results also suggest that it is difficult to predict the pricing performance of advisory services across crop-years.     

“微实习”：信息化环境下高职学生顶岗实习创新发展的路径思考

计算机网络信息化的普及,日益挑战着传统的教育教学模式.在信息化环境下,以职教新干线和微信为载体,前者重在顶岗实习教学辅之以管理,后者重在顶岗实习管理辅之以教学,两者优势互补,互为路径,构建碎片化、模块化、生活化的顶岗实习教学和管理互动模式,即“微实习”模式.     

基于市场均衡模型的中国玉米供需变化与趋势预测

当前国内外粮食供求形势在不断变化,为保障国家粮食安全,中国政府及相关部门提出研究构建国家粮食安全新战略体系。在此背景下,对中国玉米生产、消费、进出口的影响因素进行定量分析,通过构建市场均衡模型,对中国玉米供求平衡的变化与趋势进行预测分析。模型研究结果显示,对于玉米供给而言,到2025年中国玉米产量还有7.9%的上升空间,种植面积对于玉米价格的反应较为滞后,而农业补贴政策对于农民种植意愿的提高具有较为显著的效果;增强玉米生产科技要素的投入及提高抗击自然灾害的能力,有利于玉米单产水平的提高。对于玉米需求而言,到2025年中国玉米消费量将要增长38%,玉米饲用需求量和工业需求量呈刚性增长;由于玉米消费量增长速度高于生产量的增长,未来中国玉米产需缺口将会越来越大,玉米供求形势不容乐观。在此基础上,提出了立足国内生产、加大对农业四项补贴的投入力度、充分利用国际市场资源、科学调控玉米深加工等政策建议。     

不同规格根际调控基质块对玉米生长及Cd吸收的影响

污染土壤修复一直是科学家高度关注的问题。目前通常采用的是物理、化学和生物修复方法,但上述方法都有一定局限。为了探索新的方法技术,为根际调控修复污染农田提供技术和实践依据,采用4种不同规格基质块（直径×厚度分别为50 mm×20 mm、35 mm×20 mm、50 mm×25 mm、65 mm×20 mm,质量分别为40.0、19.6、50.0、67.6 g）与含5.19 mg·kg-1 Cd的土壤组合成5个处理的盆栽试验,探索不同规格根际调控基质块对玉米生长及Cd吸收的影响,进行基质块根际调控阻抗重金属研究尝试。结果表明,体积和质量最大基质块处理5比其他处理显著促进了玉米地上部生长,同时,该处理的总根系干重、块内和块外根系干重也显著高于其他处理。与不用基质块的处理1（CK）相比,应用基质块的玉米地上部Cd含量降低了11.5%~46.3%、根系降低了1.19%~56.0%,只有处理5的玉米地上部Cd含量显著下降。试验结果还表明,根际调控需要适当调节空间,验证了本科研组提出的重金属根际调控技术的可行性以及实际应用的可操作性。     

黑龙江省玉米产业现状与发展策略

该文分析了黑龙江省玉米产业的现状,阐述了黑龙江省发展玉米产业在地域条件、畜禽养殖等方 面的优势,以及专用玉米品种缺乏、精深加工比重低、社会化服务体系不健全等主要问题与制约因素,并 提出了应重视玉米新品种选育、推广标准化生产技术的、优化产业结构和布局和提高产业组织化程度及建 立产业化网络平台等促进黑龙江省玉米产业发展的策略。     

高温定时法测定高水分玉米水分结果不确定度的评定

180℃高温定时法测定玉米水分是新检验方法,对其应进行多方面印证。通过分析高水分玉米水分的测量结果、标准不确定度、扩展不确定度。佐证新方法可信。     

Beyond Illinois Brick: The Law and Economics of Cost Pass-Through in the ADM Price Fixing Case

This article reviews the legal standards and theeconomics of pass-through to indirect purchasers andillustrates these principles with a case involving ADMin the market for high fructose corn syrup (HFCS).With three assumptions about production technologies,buyers of HFCS experience a 100 percent pass throughof the direct overcharge. The extent of pass throughof the increase by buyers is shown to dependcritically upon the market structure of the purchasingindustry and the shape of the retail demand curve. Flexible demand functional forms are needed to avoidconstraining estimated pass through rates.     

Dynamic interfeed substitution: implications for incorporating ethanol byproducts into feedlot rations

This study examines interfeed substitution with a focus on the relationship between distiller’s dried grain with solubles (DDGS) and traditional feed grains. The dynamic linear logit model is used for the empirical analysis of interfeed substitution. The estimation results reveal that an increase in livestock and poultry outputs reduces the relative shares of corn and soybean meal to DDGS. The estimated adjustment rate indicates that the demand for feed grains is responsive in the short run with about 37% of the long-run response. This study also finds that the demand for corn and soybean meal remains inelastic even in the long run, showing the possibilities that livestock and poultry producers face high feed costs in response to an increase in the prices of corn and soybean meal. The pressures on feed costs can be alleviated by the substitutable relationship between DDGS and corn, but the substitution of DDGS for corn has a potential to provide livestock and poultry with different nutritional contents.     

超声辅助提取玉米醇溶蛋白的优化

本实验以黑玉米为原料,研究超声辅助提取黑糯玉米醇溶蛋白的方案,设计单因素试验和三因素三水平正交试验。用BCA方法测量醇溶蛋白的含量,结果表明:在30 min,30℃,乙醇浓度为60%时,醇溶蛋白的提取率最高。     

玉米产后流通中减损降耗应关注的主要环节

玉米是我国主要粮食品种,在不断提高产量的同时,研究减少玉米产后损失,降低粮食损耗和流通成本,对于确保粮食安全和提高玉米原粮品质具有重要的作用。