Block-Rate versus Uniform Water Pricing in Agriculture: An Empirical Analysis

In this article we adapt Burtless and Hausman's (1978) methodology in order to estimate farmers' demand for irrigation water under increasing block-rate tariffs and empirically assess its effect on aggregate demand and inter-farm allocation efficiency. This methodology overcomes the technical challenges raised by increasing block-rate pricing and accounts for both observed and unobserved technological heterogeneity among farmers. Employing micro panel data documenting irrigation levels and prices in 185 Israeli agricultural communities in the period 1992–1997, we estimate water demand elasticity at −0.3 in the short run (the effect of a price change on demand within a year of implementation) and −0.46 in the long run. We also find that, in accordance with common belief, switching from a single to a block-price regime, yields a 7% reduction in average water use while maintaining the same average price. However, based on our simulations we estimate that the switch to block prices will result in a loss of approximately 1% of agricultural output due to inter-farm allocation inefficiencies.     

农田水利设施建设制度的变迁与匹配性分析——以中国封建时期农田水利设施建设与治理为例

农田水利设施建设的成功取决于有效的制度保障,而有效的制度安排则取决于"基础设施属性—参与者特质—制度环境"三个要素之间的匹配,中国古代农田水利设施的发展历程便证明如此。对于中国新时期的农田水利设施建设,本文提出相应的制度安排,即大型灌区灌溉设施的集权型制度、小型灌溉设施的农民自治制度以及类经济自立型排灌区的混合型制度安排。     

中国封建社会农业基础设施建设与治理制度的变迁——以农田水利设施为例

中国封建时期农田水利设施建设绩效辉煌,其中制度起到非常重要的作用。历史上农田水利设施的发展经过了三个波动的阶段,产生了集权型、自治型和混合型三种制度安排与制度变迁,这些制度分别保证了与其相适应的设施建设绩效和灌溉绩效。中国封建时期农田水利设施建设与治理的制度变迁,为今天建立社会主义新农村和实现农业的可持续发展具有重要的启示意义。     

Adoption of improved irrigation and drainage reduction technologies under limiting environmental conditions

Modern irrigation technologies have been suggested as a means of conserving scarce water and reducing environmental pollution caused by irrigated agriculture. This paper applies an economic model of technology selection that provides a general framework to analyzing adoption of irrigation technologies under various environmental conditions. Data from the San Joaquin Valley of California is used to verify the theoretical relationships. Results suggest key variables to be considered by policy makers concerned with adoption of modern irrigation technologies. Among these variables are crop prices, water technology costs, farm organization characteristics, and the environmental conditions of the farm or the field. Policy implications were discussed and analyzed.This research was conducted while the first author was a visiting scholar with the Dept. of Agricultural Economics, University of California, Davis, and USDA-ERS, USA.     

中国全要素农田水利效率及其空间分布格局

选取我国31个省、自治区、直辖市1998—2015年的面板数据,运用数据包络分析方法测算农田水利全要素生产率。在此基础上,构建中国31省市的经济-距离空间权重矩阵,分析农田水利全要素生产率的空间相关性。研究结果表明:农田水利全要素生产率的年度波动明显,区域发展不平衡;农田水利全要素生产率的分布从高到低依次为东部地区、东北地区、西部地区、中部地区;规模效率普遍呈递减趋势,规模不经济是影响我国农田水利全要素生产率提升的主要阻力;从空间分布格局来看,农田水利全要素生产率高和低的地区都出现相对聚集的现象,而各省市具体地区的空间聚集特征强度差异较大。提出我国应注重农田水利规模效率的提升,扩大中西部地区农田水利投资规模以减少区域差异的建议。     

关于水库灌区建设及工程管理的探讨

水库灌区的建设是我国农业发展中十分重要的一环,它关系到灌区覆盖范围内的农作的收成。本文将结合灌区建设中工程管理工作当中出现的一些问题和现状进行探讨,希望能够对现在的灌区建设管理起到积极的作用。     

三网合一背景下农田水利工程可持续运行管理机制研究

2011年中央一号文件针对我国农田水利等基础设施十分薄弱的实际情况,提出了要突出加强农田水利等薄弱环节建设的重要措施。文章通过采用到有关市(县)进行实地查勘、问卷调查、走访农户、搜集数据和逻辑分析等方法,针对农田水利工程管理机制与考核历史沿革、现状、存在问题及成因进行实地调研,提出了三网合一背景下农田水利工程可持续运行管理机制主要通过内生性,"类生命体"式的方式发展。     

Latent vs. Observed Variables: Analysis of Irrigation Water Efficiency Using SEM and SUR

In this paper we compare conceptualising single factor technical and allocative efficiency as indicators of a single latent variable, or as separate observed variables. In the former case, the impacts on both efficiency types are analysed by means of structural equation modeling (SEM), in the latter by seemingly unrelated regression (SUR). We compare estimation results of the two approaches based on a dataset on single factor irrigation water use efficiency obtained from a survey of 360 farmers in the Guanzhong Plain, China. The main methodological findings are that SEM allows identification of the most important dimension of irrigation water efficiency (technical efficiency) via comparison of their factor scores and reliability. Moreover, it reduces multicollinearity and attenuation bias. It thus is preferable to SUR. The SEM estimates show that perception of water scarcity is the most important positive determinant of both types of efficiency, followed by irrigation infrastructure, income and water price. Furthermore, there is a strong negative reverse effect from efficiency on perception.