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Crop Minimum Support Price versus Cost Subsidy: Farmer and Consumer Welfare 作物最低支持价格与成本补贴:农民与消费者福利
Pub Date : 2021-10-02 DOI: 10.2139/ssrn.3934848
Prashant Chintapalli, Christopher S. Tang
should the prevailing market price be below the pre-specified MSP. In this paper, we consider a market consisting of infinitesimally small, rational, and strategic farmers (with heterogeneous production costs) who face market and yield uncertainties. Our equilibrium analysis reveals that (i) Although both cost subsidy and MSP induce more production, cost subsidy leads to a higher crop production than MSP; (ii) MSP improves farmer's and consumer's surpluses; however, cost subsidy improves consumer's surplus but it can decrease farmer's surplus, which is unexpected; (iii) Although both programs achieve the same optimal net value (i.e., sum of farmer's and consumer's surpluses minus shortage cost and expenditure), MSP always o ers higher farmer's surplus than cost subsidy and (iv) it is beneficial to invest only in cost subsidy, in both cost subsidy and MSP, and only in MSP, when the budget availability is low, moderate, and high, respectively, so that the net surplus (i.e., sum of farmer's and consumer's surpluses less the shortage cost) is also maximized along with the net value generated being maximized
若现行市场价格低于预先订明的最低限价。在本文中,我们考虑一个由面临市场和产量不确定性的无限小的、理性的、有战略的(具有异质生产成本的)农民组成的市场。我们的均衡分析表明:(1)虽然成本补贴和最优补贴都能提高产量,但成本补贴导致的产量高于最优补贴;MSP改善农民和消费者的盈余;然而,成本补贴提高了消费者剩余,却减少了农民剩余,这是出乎意料的;(iii)尽管这两个方案获得相同的最优净价值(即农民和消费者的剩余之和减去短缺成本和支出),但MSP总是比成本补贴获得更高的农民剩余;(iv)当预算可得性分别为低、中、高时,只投资于成本补贴、成本补贴和MSP以及仅投资于MSP是有益的,因此净剩余(即农民和消费者剩余的总和减去短缺成本)也最大化,同时产生的净值也最大化
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引用次数: 14
Efficiency and factors for agricultural use of sludge in circular Bulgarian economy 保加利亚循环经济中污泥农业利用的效率和因素
Pub Date : 2021-09-18 DOI: 10.2139/ssrn.3926273
Hrabrin Bachev Храбрин Башев, B. Ivanov
The issue of utilization of sludge from wastewater treatment in agriculture is an important socio-economic and environmental problem in the European Union and Bulgaria. Its significance is determined by the fact that the amount of sludge formed is constantly growing, as the annual amount of sludge produced in Europe is 8.7 million dry matter, and in Bulgaria reaches 53 thousand tons of dry matter. One of the main ways to utilize sludge from wastewater treatment is its use as fertilizer in agriculture. It is becoming a topical issue along with the growing interest in effective “transformation of wastes into products” and their inclusion in supply chains and circular economy. In other countries, there are numerous studies on the effects, factors and efficiencies of sludge use in agriculture. Despite their relevance, in-depth studies of the diverse effects and critical factors of sludge utilization in Bulgarian agriculture are at an early stage. This paper presents the results of the first part of a large-scale study aimed at determining the socio-economic effects of sludge utilization in Bulgarian agriculture. First, an approach is presented to assess the multilateral effects, efficiencies and factors of sludge utilization in agriculture. Then the various factors stimulating and limiting the utilization of sludge in Bulgarian farms are identified. The results of a case study of a holding using sludge as fertilizer are then presented. Based on a qualitative analysis of regulations and institutional structure, and surveys with managers and experts of urban wastewater treatment plants, and farmers using and not-using sludge, the institutional, political, organizational, personal, educational, informational, social, economic, and environmental factors influencing the utilization of sludge in agriculture in two regions of the country (Sofia and Burgas) are identified. Impact factors are generally divided into two types: factors influencing the behavior of agents, and factors determining the type and extent of the effects of sludge use in agriculture. Research of this type is to continue and deepen to establish the economic, sectoral and regional specificities on the basis of more representative information from all participants and interested parties in the effective utilization of sludge in the country.
农业废水处理产生的污泥的利用问题是欧洲联盟和保加利亚的一个重要的社会经济和环境问题。它的重要性是由形成的污泥量不断增长这一事实决定的,因为欧洲每年产生的污泥量为870万干物质,保加利亚达到5.3万吨干物质。利用废水处理后的污泥的主要途径之一是将其用作农业肥料。随着人们对有效的“废物转化为产品”以及将其纳入供应链和循环经济的兴趣日益浓厚,这正成为一个热门话题。在其他国家,对农业中污泥利用的影响、因素和效率进行了大量的研究。尽管它们具有相关性,但对保加利亚农业中污泥利用的各种影响和关键因素的深入研究尚处于早期阶段。本文介绍了旨在确定保加利亚农业中污泥利用的社会经济影响的大规模研究的第一部分的结果。首先,提出了一种评估农业污泥利用的多边效应、效率和因素的方法。然后确定了各种因素刺激和限制污泥在保加利亚农场的利用。然后介绍了一个使用污泥作为肥料的控股的案例研究结果。基于对法规和制度结构的定性分析,以及对城市污水处理厂的管理者和专家以及使用和不使用污泥的农民的调查,确定了影响该国两个地区(索非亚和布尔加斯)农业中污泥利用的制度、政治、组织、个人、教育、信息、社会、经济和环境因素。影响因素一般分为两类:一类是影响药剂行为的因素,另一类是决定农业污泥使用影响类型和程度的因素。这种类型的研究是在所有参与者和有关各方有效利用该国污泥的更具代表性的信息的基础上,继续和深化建立经济、部门和区域的特殊性。
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引用次数: 3
COVID-19 Pandemic-Induced Economic in Sri Lanka Eye 2019冠状病毒病大流行引发的斯里兰卡经济
Pub Date : 2021-08-22 DOI: 10.2139/ssrn.3909392
Vishwanadhan Vinishya
Over the years, there have been a number of pandemics around the world, and some of them are still occurring today. COVID-19, a corona virus, is currently sweeping the globe, with a large number of variants having already infected a significant number of people a life’s work. As a result of this, the World Health Organization declared a global health emergency. And this review study examines the impact of COVID-19 on GDP, inflation and employment in a comprehensive manner in a Sri Lanka context: economic impact, employment, poverty, tourism, and Small medium enterprises (SMEs). This paper provides a visual representation of the data has found that the pandemic had severe impacts on agriculture, industry, and service sector. Moreover, COVID-19 had a negative impact on the tourism, construction, transportation, hotel, and apparel industries, while increasing the overall unemployment rate. A rise in the unemployment rate was accompanied by an increase in the poverty line as a result of job losses. This review is more specific. There are three main factors that influence the inflation rate in the past also valid and timely proofs. Theoretically, there is inflationary pressure on the economy of Sri Lanka. In addition, Colombo stock due to the COVID-19 outbreak, the exchange in Sri Lanka is financially unstable. For example, that we get in agriculture there was a huge loss. (The total export revenue of tea was USD 347.3 Mn in 2019 and it was reduced by 270.1 USD Mn in January to March in 2020. Earnings from some of other agricultural sectors such as fruits and vegetable products (15.9 USD Mn), coconut production (136. 9 USD Mn) have significantly decreased in March 2020 compared to March 2019. In 2019 from January to June, earning from tourism was 1,901USD whereas it was the least amount of 956 (from January to June) in 2020. As a result of these cases, the economy is in a critical state.
多年来,世界各地发生了许多流行病,其中一些至今仍在发生。COVID-19是一种冠状病毒,目前正在席卷全球,大量变体已经感染了许多人。因此,世界卫生组织宣布进入全球卫生紧急状态。本综述研究以斯里兰卡为背景,全面考察了2019冠状病毒病对GDP、通货膨胀和就业的影响:经济影响、就业、贫困、旅游和中小企业。本文提供的可视化数据表明,疫情对农业、工业和服务业产生了严重影响。此外,新冠肺炎疫情对旅游、建设、交通、酒店、服装等行业产生了负面影响,整体失业率也在上升。失业率上升的同时,由于失业,贫困线也提高了。这篇评论更具体。影响通货膨胀率的主要因素有三个,过去也有有效和及时的证据。从理论上讲,斯里兰卡经济存在通胀压力。此外,科伦坡股票由于新冠疫情的爆发,在斯里兰卡的交易所财务不稳定。例如,我们在农业方面有巨大的损失。(2019年茶叶出口总收入为3.473亿美元,2020年1 - 3月减少2.701亿美元。其他一些农业部门的收入,如水果和蔬菜产品(15.9亿美元),椰子生产(136亿美元)。9亿美元)与2019年3月相比,2020年3月大幅下降。2019年1月至6月,旅游业收入为1,901美元,而2020年1月至6月的最低收入为956美元。由于这些情况,经济处于危急状态。
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引用次数: 0
Impact of COVID-19 Pandemic on Financial Health and Food Security: a Survey-Based Analysis COVID-19大流行对金融健康和粮食安全的影响:基于调查的分析
Pub Date : 2020-06-04 DOI: 10.2139/ssrn.3619245
O. Akinleye, Risikat Oladoyin S. Dauda, O. Iwegub, O. Popogbe
This study investigated the impact of COVID-19 pandemic on the health, food security and financial lives of Nigerian households. The data for the study were collected using a questionnaire for 813 households from the six geo-political zones in Nigeria and the results were analysed using descriptive statistics and ordinal logistic regression model. The findings showed that the COVID-19 pandemic has affected households’ personal savings significantly. Majority of the households’ healthcare financing is borne out of their personal income and savings in the absence of a health insurance scheme. Households experiencing worse financial status largely do not have food during the pandemic. Many households have a positive expectation that they will recover from the unfavourable financial condition they are currently experiencing and there is a strong traditional support system existing in the localities during the study period. Food insecurity during the pandemic was significantly occasioned by increases in prices, fall in income and adverse financial well-being. The study thus suggested, among others, the need to urgently enhance the economic and financial well-being of the Nigerian populace to guide against the worsening and devastating impact of the COVID-19 pandemic on food security in Nigerian households.
本研究调查了2019冠状病毒病大流行对尼日利亚家庭健康、粮食安全和财务生活的影响。该研究的数据是通过对尼日利亚六个地缘政治区域的813个家庭的问卷调查收集的,并使用描述性统计和有序逻辑回归模型对结果进行分析。调查结果显示,新冠肺炎大流行对家庭个人储蓄产生了重大影响。在没有医疗保险计划的情况下,大多数家庭的医疗保健资金来自他们的个人收入和储蓄。经济状况较差的家庭在疫情期间大多没有食物。许多家庭对他们将从目前所经历的不利财政状况中恢复抱有积极的期望,在研究期间,当地存在着强大的传统支助系统。疫情期间粮食不安全的主要原因是价格上涨、收入下降和财务状况不佳。因此,该研究建议,除其他外,迫切需要加强尼日利亚民众的经济和财政福祉,以应对2019冠状病毒病大流行对尼日利亚家庭粮食安全造成的日益严重的破坏性影响。
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引用次数: 8
Credit Impact on Agriculture Production in Pakistan 信贷对巴基斯坦农业生产的影响
Pub Date : 2020-06-03 DOI: 10.2139/ssrn.3618660
N. Khan, S. Fahad, M. Naushad, S. Faisal
The study was carried out since June, 2020. The major objective was to see the credit impacts on agriculture production in rural area of Pakistan. Secondary data was used and total 32 articles were downloaded from the net and read many times and draw the result. The result indicates that without credit agriculture development in Pakistan is impossible. Therefore the government has established different banks in rural area of Pakistan. Among these the ZTBL, HBL, UBL, Cooperative, Alfalah, Khyber banks, Muslim commercial banks are the well known banks in Pakistan which provide credits to farmers in rural area of Pakistan. The Pakistani farmers are very poor and they have no money for purchasing inputs in the country because of this, the per acre production is very less than the developed countries. In developed countries the government provide multiple loan on easy term to the farmers and they also give subsidy and support price to farmer in the countries and there the marketing system is also developed while these facilities in the developing countries are poor and they sell their products to middle men on very low price and the targeted price they do not achieve, So in developing countries the farmers always poor and they never capable to purchase inputs in proper time for their agriculture activity. The agriculture credit impact on the agriculture production was found positive in Pakistan while in Pakistan the influential farmer get the loan very easily while the poor and small farmer have no access to these facilities in the country. The loan share in Punjab is 85 percent while the remaining part of the country get only 15% loan in the whole amount of agriculture credit. The process of the loan is very complicated and in time the loan is not available to farmer for their inputs purchasing. Some farmers get the loan while the interest rate is very high and the return of the loan is very difficult and sometime sell their land for returning the loan. The bank staff behaved very badly with the farmer in getting the loan. Similarly the loan amount is very less than the requirement while in some area the religious people do not allow the loan from the bank and tell that it is interest which is prohibited in Islam. On the basis of problems the study recommend that to provide huge amount loan to farmer in Pakistan for enhancing agriculture production; Support price should be imposed on agriculture output in the country; Subsidies price should be put on the inputs in the country; Free based education should be provided to farmer children in the country; Free based hospital should be constructed for health services to farmers in the country; Market facilities should be developed for farmer in the country; High quality varieties of all crop should be provided to farmers in the country; All farmers should be exempted from the tax in the country; Bank number should be increased for provision of loan to farmer in the country; Monitoring set up should be deve
该研究自2020年6月开始进行。主要目的是了解信贷对巴基斯坦农村地区农业生产的影响。利用二次数据,从网上下载共32篇文章,多次阅读并得出结果。结果表明,没有信贷,巴基斯坦的农业发展是不可能的。因此,政府在巴基斯坦农村地区建立了不同的银行。其中ZTBL银行、HBL银行、UBL银行、Cooperative银行、Alfalah银行、Khyber银行、穆斯林商业银行是巴基斯坦著名的向农村地区农民提供信贷的银行。巴基斯坦农民非常贫穷,他们没有钱在国内购买投入物,因此,每英亩的产量远远低于发达国家。在发达国家,政府向农民提供多种优惠贷款,他们还向国家的农民提供补贴和支持价格,那里的营销系统也很发达,而发展中国家的这些设施很穷,他们把产品以很低的价格卖给中间商,他们没有达到目标价格。所以在发展中国家,农民总是很穷,他们从来没有能力在适当的时候为他们的农业活动购买投入。在巴基斯坦,农业信贷对农业生产的影响是积极的,而在巴基斯坦,有影响力的农民很容易获得贷款,而该国的穷人和小农却无法获得这些设施。旁遮普邦的贷款份额为85%,而该国其他地区仅获得农业信贷总额的15%。贷款过程非常复杂,农民无法及时获得贷款用于购买投入物。一些农民在利率很高的情况下获得贷款,贷款很难偿还,有时他们会卖掉土地来偿还贷款。银行职员在贷款问题上对农民的态度非常恶劣。同样,贷款金额远远低于要求,而在某些地区,宗教人士不允许从银行贷款,并告诉这是伊斯兰教禁止的利息。针对存在的问题,本研究建议向巴基斯坦农民提供巨额贷款以促进农业生产;对国内农业产出实行扶持价格;补贴价格应放在国内的投入;应向农村儿童提供免费教育;为农村农民提供免费医疗服务,应建立免费医院;为农村农民开发市场设施;向全国农民提供各种作物的优质品种;在这个国家,所有的农民都应该免税;增加向农村农民提供贷款的银行号码;建立监测机制,对农民使用信贷的情况进行监测。柴油价格应以低税率提供给农村农民;为提高农业生产,应该向农村农民提供低息电力设施。发达的农民之所以把国家发展得很好,是因为他们及时为自己的农业活动购买了投入物。因此,要求巴基斯坦政府向该国农民提供足够的信贷,以提高巴基斯坦的农业生产。中转局应在作物播种季节及时发放信贷,并确保信贷的合理利用。此外,银行应通过培训讲习班和相关方案提供技术指导,以使巴基斯坦的作物产量最大化。扩大畜牧业有助于吸收失业和未经训练的农村劳动力,从而有助于减缓未经训练的农村劳动力向城市迁移的过程。畜牧业信贷投资的效益比种植业高出100%,因此应给予研究区畜牧业主更多的信贷。获得信贷的程序应简化和灵活,使小农受益;应利用电子和印刷媒体,提高农民对农业信贷重要性的认识;巴基斯坦政府应在农村地区建立新的村镇银行,这将是解决小农问题的有益金融机制;巴基斯坦政府应该引入新型的信贷计划,比如通过Khushhali银行有限公司提供低利率的实物贷款,因为这样更容易接触到小农户,从而提高农业生产率。发展农业研究和推广体系,加快最新农业技术在国内的传播和采用。
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引用次数: 0
Performance Labor in Agriculture Sector in Java Island Using Panel Data 2007-2014 爪哇岛农业部门绩效劳动力的面板数据2007-2014
Pub Date : 2020-06-01 DOI: 10.22487/agroland.v7i1.275
Joko Pranoto, A. Utomo, Muhamad Fathul Muin
The highest decrease in the number of food crop workers occurred in Java, as many as 2,87 million people in 2007-2014. The age of food crop agriculture workers in Java is dominated by workers aged over 45 years (64,95%). If there is no addition of new workers, then the food crop labor will be increasingly dominated by old age groups which will make it difficult for the agricultural sector to carry out its mandate to improve and maintain sustainable food security. The purpose of this study is to describe the condition of the food crop agriculture subsector from the aspect of labor absorption in Java for the period 2007-2014 and analyze the effect of the regional GDP of food crops subsector, real wages, education, and land area to the absorption power of agricultural food crops subsector on labor in Java. Central Java Province is a province with the largest decrease in the number of agricultural food crop subsector workers compared to the other four provinces on Java island. From the results of the estimation, the fixed-effect model with cross-section SUR is chosen as the best model. The results show that the variable of regional GDP, real wage, and size of land area has a significant and positive effect on the labor absorption of agricultural food crops subsector, while education has a significant and negative effect. Overall this model able to explain variations of this phenomenon by 89,32%. Meanwhile, another 10,68% is explained by other variables not included in the model.
粮食作物工人人数减少最多的是爪哇,2007-2014年减少了28700万人。爪哇粮食作物农业工人的年龄以45岁以上的工人为主(64.95%)。如果不增加新的工人,那么粮食作物劳动力将越来越多地由老年人群体主导,这将使农业部门难以履行其改善和维持可持续粮食安全的任务。本研究的目的是从爪哇2007-2014年的劳动力吸收方面描述粮食作物农业分部门的状况,并分析粮食作物分部门的区域GDP、实际工资、教育、土地面积对农业粮食作物分部门对劳动力的吸收能力的影响。与爪哇岛上其他四个省份相比,中爪哇省是农业粮食分部门工人人数减少最多的省份。从估计结果来看,选择具有截面SUR的固定效应模型作为最佳模型。研究结果表明,地区GDP、实际工资、土地面积对农业粮食作物细分行业劳动力吸收具有显著的正向影响,而教育对农业粮食作物细分行业劳动力吸收具有显著的负向影响。总的来说,这个模型能够解释这种现象的89,32%的变化。与此同时,另有10.68%是由模型中未包含的其他变量解释的。
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引用次数: 0
Identification of Product Groups Recommended for Trade on the Food Platform in Terms of Domestic and Foreign Turnover 根据国内外营业额确定食品平台推荐贸易的产品类别
Pub Date : 2019-12-18 DOI: 10.30858/zer/115187
I. Szczepaniak, Łukasz Ambroziak, J. Drożdż
The electronic trading platform for agri-food products could improve the efficiency and effectiveness of food trade and strengthen Poland’s position on the global market. In Poland, there has been no such solution so far, hence the Ministry of Agriculture and Rural Development has taken the initiative to create an electronic trading platform called “Food Platform”. Its essence will consist in matching secure buy and sell transactions. The purpose of the paper is to identify groups of products recommended for trade on the Food Platform in terms of domestic and foreign turnover. The study identifies sectors of the Polish food industry, with the most significant share, and identified agricultural products that are particularly important for Polish agriculture. In other words, the agri-food sectors that could potentially deliver products to the sales platform were selected. Next, this selection was verified in terms of the possibility of trade activities on the world market. The analysis shows that the product groups recommended for trade on the Food Platform are: cereals, rapeseed, sugar, fruit and vegetables, milk, red meat and poultry meat, together with their preserves. The selection of specific products which may be the subject of commercial transactions on the sales platform will result from further detailed analyzes of individual agri-food markets.
农产品电子交易平台可以提高食品贸易的效率和效果,加强波兰在全球市场上的地位。在波兰,到目前为止还没有这样的解决方案,因此农业和农村发展部主动创建了一个名为“食品平台”的电子交易平台。其本质在于匹配安全的买卖交易。本文的目的是根据国内外营业额确定推荐在食品平台上进行贸易的产品组。该研究确定了波兰食品工业中占有最大份额的部门,并确定了对波兰农业特别重要的农产品。换句话说,选择了可能向销售平台交付产品的农业食品部门。接下来,根据世界市场上贸易活动的可能性来验证这一选择。分析显示,建议在食品平台上交易的产品类别有:谷物、油菜籽、糖、水果和蔬菜、牛奶、红肉和禽肉及其蜜饯。具体产品的选择可能是在销售平台上的商业交易的主题,将来自于对个别农产品市场的进一步详细分析。
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引用次数: 0
Fundamental Surprises, Market Structure, and Price Formation in Agricultural Commodity Futures Markets 农产品期货市场的基本意外、市场结构和价格形成
Pub Date : 2019-04-25 DOI: 10.2139/ssrn.3378223
Xiaodong Du, S. Kane
Our study seeks to provide a better understanding of price formation process and determining factors of price volatility in agricultural commodity markets. We focus on corn and soybean futures traded in CBOT (Chicago Board of Trade). We innovatively construct two sets of variables to represent fundamental changes and market structure of the commodity markets. Fundamental changes are captured by the deviations of the supply and demand condition estimates released by USDA from the pre-announcement analysts’ forecasts published by Bloomberg. We employ the transaction databases of CFTC (Commodity Futures Trading Commission) to construct the percentage shares of detailed participation group trading in the market. While fundamental changes are based on public observations and analysis, transaction percentage shares of trader groups are private information of individual traders. Both the fundamental surprises and the market structure related variables are found to have statistically significant effects on price and price volatility. Furthermore, the impacts vary across quantiles of the conditional distributions.
我们的研究旨在更好地理解农产品市场价格形成过程和价格波动的决定因素。我们关注芝加哥期货交易所(CBOT)的玉米和大豆期货。我们创新性地构建了两组变量来表示商品市场的基本变化和市场结构。美国农业部发布的供需状况估计值与彭博社(Bloomberg)发布的分析师预测之间的偏差体现了根本性的变化。我们利用美国商品期货交易委员会(CFTC)的交易数据库来构建详细参与群体交易在市场中的百分比份额。虽然基本变化是基于公众观察和分析,但交易者群体的交易百分比份额是个人交易者的私人信息。发现基本面意外和市场结构相关变量对价格和价格波动都有统计上显著的影响。此外,影响在条件分布的各个分位数之间有所不同。
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引用次数: 0
Physio-Chemical Properties of Sugar Syrup Produced From Two Varieties of Yam (Dioscorea dumetorum and Dioscorea alata) Using Exogenous Enzymes 用外源酶对两种山药(薯蓣薯蓣dumetorum和薯蓣alata)生产糖浆的理化性质研究
Pub Date : 2019-02-10 DOI: 10.31248/RJFSN2018.055
D. Okafor, M. Chukwu
Physio-chemical properties of sugar syrup produced from two varieties of yam (Dioscorea dumetorum and Dioscorea alata) using exogenous enzymes were studied. Starch and flour samples of two yam varieties (Dioscorea dumetorum and Dioscorea alata) were converted into sugar syrup by enzyme hydrolysis using exogenous enzymes. The sprouted and unsprouted tubers were processed into dried starch by washing, peeling, and milling; stirring, settling for about 6 hours; the supernatant was decanted and the sediment which contained the starch was filtered with muslin cloth and oven-dried at 70oC for 30minutes to produce the dry starch. The sprouted and unsprouted tubers were also processed into fine flour by drying, milling and sieving with a 0.8 mm sieve. Alpha and Beta amylase enzymes were used in the syrup production. Physiochemical analysis was carried out on the syrup and results obtained were subjected to statistical analysis using analysis of variance (One-way ANOVA). The results obtained show that the pH values ranged from 4.45 to 5.65 while the moisture content values ranged from 67.42 to 72.25%; the dextrose equivalent results for the samples were 26.68, 26.47, 29.64, 27.13, 29.56, 26.34, 30.15 and 24.79% for the un-sprouted Dioscorea dumentorum flour (UD), sprouted Dioscorea dumetorum flour (SD), un-sprouted Dioscorea alata flour (UA), sprouted Dioscorea alata flour (SA), un-sprouted Dioscorea dumetorum starch (UDS), sprouted Dioscorea dumetorum starch (SDS), un-sprouted Dioscorea alata starch (UAS) and sprouted Dioscorea alata starch (SAS) respectively. This indicates that sample UAS had the highest level of hydrolysis. For the sugar syrups; sample SD had the highest viscosity value (950.05cp) while sample UA had the lowest value (835.10cp). The specific gravity of the sugar syrup samples ranged from 1.16 to 1.29 with sample SDS having the highest value and sample UD having the lowest value. Result from the analysis on sugar concentration (disaccharides) showed that the highest maltose concentration was recorded in sample SDS (57.27%) and the lowest was obtained in sample UA (51.65%). The glucose concentration of the sugar syrup samples ranged from 1.55 to 2.05%; sample SA recorded the lowest value of 1.55% while UAS recorded the highest value of 2.05%. The maltotriose, raffinose and starchyose concentrations of the sugar syrup samples ranged from 7.39 to 7.76%, 0.12 to 023% and 0.93 to 1.15% respectively. Results of this work suggest that sugar syrup can be made from underutilized yam species.
采用外源酶对两种薯蓣品种(薯蓣薯蓣dumetorum)和薯蓣薯蓣(Dioscorea alata)糖浆的理化性质进行了研究。利用外源酶将两个薯蓣品种(薯蓣dumetorum和薯蓣alata)的淀粉和面粉样品水解为糖糖浆。发芽和未发芽的块茎经洗涤、剥皮和碾磨加工成干淀粉;搅拌,静置约6小时;倒出上清液,含淀粉的沉淀物用细棉布过滤,70℃烤箱干燥30min,得到干淀粉。发芽块茎和未发芽块茎经干燥、碾磨、0.8 mm筛分等工序加工成细粉。α和β淀粉酶用于糖浆的生产。对糖浆进行理化分析,所得结果采用方差分析(One-way ANOVA)进行统计分析。结果表明:pH值为4.45 ~ 5.65,含水率为67.42 ~ 72.25%;样品中未发芽薯蓣面粉(UD)、发芽薯蓣面粉(SD)、未发芽薯蓣面粉(UA)、发芽薯蓣面粉(SA)、未发芽薯蓣淀粉(UDS)、发芽薯蓣淀粉(SDS)、未发芽薯蓣淀粉(UAS)和发芽薯蓣淀粉(SAS)的葡萄糖含量分别为26.68、26.47、29.64、27.13、29.56、26.34、30.15和24.79%。这表明样品UAS具有最高的水解水平。对于糖浆;样品SD的粘度值最高(950.05cp),样品UA的粘度值最低(835.10cp)。糖浆样品的比重范围为1.16 ~ 1.29,其中样品SDS最高,样品UD最低。糖(双糖)浓度分析结果表明,样品SDS中麦芽糖浓度最高(57.27%),样品UA中麦芽糖浓度最低(51.65%)。糖浆样品葡萄糖浓度范围为1.55 ~ 2.05%;样品SA最低,为1.55%,UAS最高,为2.05%。糖浆样品中麦芽糖、棉子糖和淀粉糖的浓度分别为7.39 ~ 7.76%、0.12 ~ 023%和0.93 ~ 1.15%。这项工作的结果表明,糖糖浆可以从未充分利用的山药品种。
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引用次数: 1
A Credibility-Based Yield Forecasting Model for Crop Reinsurance Pricing and Weather Risk Management 基于可信度的农作物再保险定价与天气风险管理产量预测模型
Pub Date : 2019-02-04 DOI: 10.2139/ssrn.2663932
Wenjun Zhu, Lysa Porth, K. S. Tan
PurposeThe purpose of this paper is to propose an improved reinsurance pricing framework, which includes a crop yield forecasting model that integrates weather variables and crop production information from different geographically correlated regions using a new credibility estimator, and closed form reinsurance pricing formulas. A yield restatement approach to account for changing crop mix through time is also demonstrated.Design/methodology/approachThe new crop yield forecasting model is empirically analyzed based on detailed farm-level data from Manitoba, Canada, covering 216 crop varieties from 19,238 farms from 1996 to 2011. As well, corresponding weather data from 30 stations, including daily temperature and precipitation, are considered. Algorithms that combine screening regression, cross-validation and principal component analysis are evaluated for the purpose of achieving efficient dimension reduction and model selection.FindingsThe results show that the new yield forecasting model provides significant improvements over the classical regression model, both in terms of in-sample and out-of-sample forecasting abilities.Research limitations/implicationsThe empirical analysis is limited to data from the province of Manitoba, Canada, and other regions may show different results.Practical implicationsThis research is useful from a risk management perspective for insurers and reinsurers, and the framework may also be used to develop improved weather risk management strategies to help manage adverse weather events.Originality/valueThis is the first paper to integrate a credibility estimator for crop yield forecasting, and develop a closed form reinsurance pricing formula.
目的提出一种改进的再保险定价框架,该框架包括一个作物产量预测模型,该模型使用一种新的可信度估计器整合了不同地理相关区域的天气变量和作物生产信息,以及封闭形式的再保险定价公式。还演示了一种产量重述方法,以说明随着时间的推移作物组合的变化。设计/方法/方法基于加拿大马尼托巴省1996 - 2011年间19238个农场的216个作物品种的详细农场数据,对新的作物产量预测模型进行了实证分析。此外,还考虑了30个站点的相应天气数据,包括日气温和降水。结合筛选回归、交叉验证和主成分分析的算法进行评估,以实现有效的降维和模型选择。结果表明,与传统回归模型相比,该模型在样本内和样本外的预测能力均有显著提高。本实证分析仅限于加拿大马尼托巴省的数据,其他地区可能会显示不同的结果。实际意义从风险管理的角度来看,本研究对保险公司和再保险公司是有用的,该框架也可用于制定改进的天气风险管理策略,以帮助管理不利天气事件。原创性/价值本文首次将可信度估计量整合到作物产量预测中,并开发了封闭形式的再保险定价公式。
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引用次数: 11
期刊
FoodSciRN: Other Agricultural Food Science
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