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Track: Agriculture
Sun Ling
JiangSu Academy of Agricultural Sciences
Nanjing
JiangSu, 210014
P.R. CHINA
Telephone: 0086-25-4438285
Fax: 0086-25-439-0185
E-mail: jaasm@public1.ptt.js.cn
Zhu Zesheng
GIS Implementation of Management System for Farm Scientific Fertilization
In recent years, scientific management of farm fertilization has been a very important research direction in the field of agricultural engineering and modernization. However, how to design and implement an optimal or highly efficient management system of farm fertilization in practice has been a very complex and difficult problem. This is because spatial variables relevant to the geographic position of the field strongly influence both the methods and the efficiency of scientific farm fertilization. Although there are a large number of papers that discuss the problem of how to construct and implement the management model of scientific fertilization related to the above system, the solutions to those problems are usually not satisfactory. The major reason resulting in this situation can be further discussed as follows. 1) The number of managed objects or fields in a management system of scientific fertilization is usually influenced by various complex geographical factors. 2) Some important physical and
chemical variables in those objects, such as nutrient level and physical properties related to soil spatial structure, have not be included in the past model. 3) Traditional methods for building a numeric management model of scientific fertilization have not effectively processed the above various complex factors related to spatial information. 4) Most of the farms cannot effectively execute scientific fertilization suggestions or advice from the field system especially in a complex field situation due to lack of map support for practical field fertilization operations. 5) These troubles in field fertilization operations usually result in a lot of waste of fertilizer and a loss of money as well as reduction of grain yield. However, our research has shown that an advanced scientific fertilization management system can be implemented in a GIS environment such as ArcView Version 2.1. This paper presents our new method for designing and implementing the system in the environment and our new advances in research
of scientic farm fertilization management system. First, the general principle and basic method of designing the basic model of the management system are discussed. Second, the basic GIS environment provided by ArcView Version 2.1 and how to implement the above basic model in it are investigated respectively. Third, some key techniques used to implement the management model of scientific fertilization in the ArcView Version 2.1 environment are discussed, which includes how to develop the customized ArcView Version 2.1 environment for the management system by the Avenue and Microsoft Visual Basic as well as Visual C++. Otherwise, we discuss some important experiences that include how to apply an object-oriented method for building the complex model of the management system and how to apply ArcView Version 2.1, Visual Basic 4.00 and Visual C++ 2.0 to develop and implement the model. We especially make use of the database engine function of Visual Basics 4.0 to implement a powerful database management module
for expanding the ArcView Version 2.1 data management function in order to implement our system perfectly. Visual C++ 2.0 is used to implement various DLLs to complete various complex numeric computation and simulation operations. In summary, our current research and achievements have shown that ArcView Version 2.1 with its Avenue is one of the most efficient and flexible environments for developing an advanced management system of farm fertilization.
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