| Nitrogen is the plants' main nutrition element, and is the main composition composing the protein, and affects hugely crops' yield and quality. The quantity of nitrogen element (NE) supplying and quality of plants' NE nutrition produce an effect on plants' growth status in a large part. Because the NE fertility in the soil is weak on average, and nitrogen accumulates uneasily in the soil, moreover, the modern agriculture integration also hastens the organic matter and nitrogen consuming, fertilizing the NE fertilizer can advance the crops' yield observably, and improve the crops'quality, as well as enhance the soil fertility and productivity. But, if the fertilization is unreasonable or unscientific, not only its economic benefit is low, but also it may bring bad results to crops, soil and environment. So, scientific fertilization is very important. With the information technology of the time being used in the field of NE fertilizing, a series of NE fertilization recommendation systems (NEFRS) appear, and bring a great deal of economic benefit to agricultural production. However the NEFRS favours the wide agriculture, with the development of 3S technology, the NEFRS is less and less suitable to the accurate fertilization's request of precise agriculature. So, today, an important problem desiderating to solve is exploring a NEFRS, which can apply to the precise agriculture.This paper, taking Culai town of Daiyue county in Shandong province as a research area, taking NE fertilization models of winter wheat as a fertilization theory, basing on analysing the actuality——GIS technology of the time applies to the NE fertilization of winter wheat, puts forward a new NEFRS of winter wheat basing on GIS wireless service. This sytem integrates GIS service, GPS location, wireless communication and mobile application development. It has a beauty and simple face, supports inferior mobile devices, and faces the ordinary, popular users. It can promote the service of NE fertilization recommendation of winter wheat to the field plots farther, and realize the purpose of searching service of supplying nitrogen fertilizer fertilization recommendation at anywhere, anytime.This paper consists of seven Chapters. Chapter 1 first discusses this paper's research backgrounds and research significances, then puts forward the research contents and technical routes, basing on analysing the actualities: 1) researching the nitrogen fertilizer fertilization recommendation system of winter wheat development status at home and abroad; 2) researching the GIS technology, which applies to the nitrogen fertilizer fertilization of winter wheat, application status.Chapter 2 introduces the relative techniques of the GIS wireless service. It first discusses the connotation of the GIS wireless service, then introduces the Java ME technoque, locationg technique, wireless communication technique, and graphic display technique respectively by taking Java language as the platform.Chapter 3 first introduces the basic theory of guiding crops' NE fertilization, then designs the NE fertilization models aiming at winter wheat by using nutrient balance method and abundance index method.Chapter 4 first makes a general design for the system, then expounds the system design principle and realization purpose, system development environment, general frame and data flow, at last designs the function modules including server and mobile in detail.Chapter 5 is the system database design. To begin with, it relates how to deal with the geographical data, including land present usage data and sampling points data, then makes a design for the spatial database, including the transform between the Spaghetti structure and the planar table, SVG encoding and SVG map clolor library, at length structures the geographical data and attribute data respectively.Chapter 6 mainly dissertates how to realize the system functions. Basing on confirming the system solution, it relates how to develop and realize the main function modules, including map zoom, pan, full-extent, inquiry and measure operations, GPS location operation and nitrogen fertilizer fertilizing operation.The last Chapter makes a summary of this paper, puts forward research conclusions, and brings forward the relevant advices in allusion to the shortage of this study. |
