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Hot Ball Mill Brief Introduction

We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment.If you are interested in our products or want to visit the nearby production site, you can click the button to consult us.

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  • 60s Online 1 60s Online

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  • One year 4 One year

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The reasons for choosing us

Pre-Sale Solutions: Based on the customer's request and budget, We provide you with the professional plan, process flow design and manufacturer equipment.

Sale Solutions:our experienced technicians is available on the phone and on the internet, so customer can get instance guidance asa

After-Sale Solutions:The quality guarantee is 12 months after finishing the trial run of machines which has been shipped to the buyer side

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evolution of the knowledge system for agricultural

Knowledge systems—networks of linked actors, organizations, and objects that perform a number of knowledge-related functions that link knowledge and know how with action—have played a key role in fostering agricultural development over the last 50 years. We examine the evolution of the knowledge system of the Yaqui Valley, Mexico, a region often described as the home of the green revolution for wheat, tracing changes in the functions of critical knowledge system participants, information flows, and research priorities. Most of the knowledge system's key players have been in place for many decades, although their roles have changed in response to exogenous and endogenous shocks and trends (e.g., drought, policy shifts, and price trends). The system has been agile and able to respond to challenges, in part because of the diversity of players (evolving roles of actors spanning research–decision maker boundaries) and also because of the strong and consistent role of innovative farmers. Although the agricultural research agenda in the Valley is primarily controlled from within the agricultural sector, outside voices have become an important influence in broadening development- and production-oriented perspectives to sustainability perspectives

Over the last 50 years, agricultural communities in developing countries have experienced dramatic changes in their requirements for and access to information, knowledge, and know how related to cropping systems and commodity markets (1). As part of a post-World War II effort to enhance agricultural production, research systems focused on development and deployment of improved genetic materials and management practices for key food staple crops (2, 3). Over time, with the changing landscape of agricultural production (4, 5), transformations in global food demand and marketing systems (6), and increasing foci on sustainability objectives, including environmental concerns, these systems have been required to evolve to continue providing relevant support

In this paper, we explore the evolution of knowledge systems for agricultural development that has occurred in the home of the green revolution for wheat. Knowledge systems are networks of linked actors, organizations, and objects that perform a number of knowledge-related functions that link knowledge and know how with action (including research, innovation, development, demonstration, deployment, and adoption).* They include the institutions, human capital, financial resources, and incentives that give such systems the capacity to function. Although knowledge systems are not the result of master design, they can be understood and manipulated in ways that improve their performance. Previous research has highlighted communication and translation among players within knowledge systems as key functions for managing the boundaries between scientific knowledge and decision making (7–9). To date, little attention has been paid to how these functions change over time in response to new challenges. We use examples from the Yaqui Valley (YV) in Sonora, Mexico, to examine the current state of the knowledge systems for agricultural development and their evolution in response to postgreen revolution agricultural sustainability challenges

As a leader in technology adoption and harbinger of change for northern Mexico, the YV is well-suited for a study on knowledge systems. It is home to a key research station of the Centro Internacional de Mejoramiento de Maiz y Trigo [International Maize and Wheat Research Center (CIMMYT)], one of the main centers of the Consultative Group on International Agricultural Research (CGIAR) system, and it was one of the earliest focal areas for developing country agricultural research and development. Involved in participatory research with agronomists, economists, and breeders, Yaqui farmers and farmer groups helped develop germplasm and management practices that led to dramatic increases in wheat yields. International, national, and producer efforts have all contributed to productivity gains in this intensively cultivated, irrigated valley, which is 233,000 ha in size

evolution of the knowledge system for agricultural

Like many other postgreen revolution agricultural regions around the world, the YV has struggled to address the offsite impacts of heavy fertilizer use (10–12), the growing competition for water from other sectors (13, 14), and economic and policy conditions that undermine farm profitability (15, 16). Such transitions have put new pressures on the YV knowledge system to create and apply different kinds of information at the local level, because support for agricultural extension and research has waned (SI Text has a more complete description of the site and its challenges). The knowledge system has grown and evolved in response, although considerable challenges remain

Using primary information collected through key informant interviews and farmer surveys and secondary literatures and descriptions, we trace the links between knowledge and action that allow the knowledge system to address the critical sustainability challenges that have emerged in recent decades. In-depth interviews with over 60 individuals from the organizations that comprise the YV knowledge system (including many farmers) are used to map its structure and dynamics. We analyze trends in farm management (e.g., cropping patterns and planting systems, input use, and marketing) using farm survey data collected by CIMMYT in the 1980s and 1990s (17, 18) and Stanford University in 1994/1995, 1995/1996, 2003/2004, and 2004/2005 (19)

The YV knowledge system integrates scientific knowledge with experiential knowledge built through decades of agricultural tradition. It has influenced creation, adaptation, and use of knowledge to address challenges facing the agricultural sector. Fig. 1 depicts a 2005 snapshot of the YV knowledge system—its organizations, their multiple interactions within and outside of the Valley, and the multidirectional flows of knowledge between them. Its structure lends insight into which issues garner attention and research effort

evolution of the knowledge system for agricultural

Many of the YV's agricultural research institutions were conceived alongside the green revolution to support development and delivery of agricultural inputs, services, and knowledge to farmers. CIMMYT releases improved germplasm (higher yielding and stress tolerant) into the National Agricultural Research System (NARS). The National Forestry, Agriculture, and Livestock Research Institute (INIFAP) and its subnational affiliates focus on adaptive breeding and management recommendations, with core budget support from the Mexican government. Recently, supplemental project funding from Mexican and international sources has replaced declining core budget support (20). Farmers have shaped research priorities through their local research and development funding arm, the Agricultural Research and Experimentation Board of the State of Sonora (PIEAES; known locally as the Patronato), which represents all farmers in the state of Sonora on agricultural research issues and supports agricultural research and development with funds raised from farmers through planting fees. The Patronato's success led to nationwide replication. In many cases, the most effective and relevant organizations rely on dynamic individuals who make critical linkages between knowledge producers and users

A decline in government support for agricultural development from the late 1980s led to downscaling and decentralization of federally financed agricultural extension. According to practitioners and scientists, this resulted in a marked decline in official linkages between researchers and farmers. Extension service delivery was subcontracted to private sector providers, and fees were introduced for farmers who could afford the services (21). Technical advisors used by the YV's credit unions have assumed many of the state's extension functions. According to interviews, credit union technical advice is dictated by the revenue-maximizing interests of farmers and credit unions; a mechanism no longer exists for supplying extension services motivated by other objectives, such as reducing agriculture's offsite impacts

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