Design And Implementation Of Nongan County Fertilization System

The application of chemical fertilizer is of great significance to increasing the yield and efficiency of crops,but the unreasonable application of chemical fertilizer will cause a certain degree of environmental pollution and waste of fertilizer,even the decline of land quality,which will result in the negative effect of reducing production.In order to solve this problem,this paper collate and summarize the relevant data through a certain investigation and study,and comprehensively analyze the influence of soil testing formula fertilization on crop yield increasing and efficiency,through the study of the theory of plant nutrition,the application of statistics to describe the status of fertilizer application,and the establishment of a statistical zoning fertilization model.With the growing maturity of computer communication technology and soil testing technology,an expert system for soil testing and fertilization is introduced in China,which uses computers to guide farmers to carry out fertilization.After years of development,the expert system of soil testing and formulated fertilization has made great contributions to the popularization of soil testing and formulated fertilization in China.With the development of 3S technology and computer technology,the real-time popularization of soil testing and formulated fertilization technology has become a reality.At present,the most commonly used model of soil testing formula fertilization is to use ARCGIS Engine to establish expert client system,build up the local fertilization model,and generate the recommended fertilizer card by replacing the soil nutrient and yield index,and then distributing it to the farmers' hands.Some experts also use mobile terminal WebGIS to carry out research on soil testing and fertilizer recommendation technology.According to the development of soil testing formula fertilization and its application to computer technology,based on the data of a large amount of yield and soil fertility,this paper put forward a statistic based fertilization model,and set up a special family system based on short message and GIS.In this paper,by statistical analysis of the cultivated land and soil nutrients in certain areas,a statistical zoning model(Statistic Division Fertilization Model,referred to as SDFM)is established,and the interval of high,middle and low yield and soil nutrient content are divided according to the model parameters.Multi point experiments were carried out in the region to obtain the appropriate amount of fertilizer for their regions.Then,on the basis of suitable amount of fertilizer in the region,the results of the final fertilizer recommendation were obtained by adjusting the actual yield of the decision point and the value of soil nutrient,and the decision of the amount of fertilizer was made.Taking the data of the output and nutrient sampling points of Nongan County for 2006~2011 as the original data,the decision comparison was made by using the nutrient balance method of target yield and the model of statistical zoning fertilization.The results showed that the probability of abnormal value of decision results in the statistical division model was only 2%,while the probability of abnormal value of decision results for nitrogen,phosphate and potassium fertilizers by the target yield method was 45%,47% and 47% respectively.It can be seen that statistical regionalized fertilization greatly improves the accuracy of decision-making results,and thus promotes the application of soil testing and formulated fertilization under the county level.Taking the statistical regionalized fertilization model as the calculation model of the amount of fertilizer,combined with the short message cat technology,GIS technology and database technology,we have established a precise fertilization recommendation system for the majority of farmers.The system integrates the two development components of short message cat and the.Net component of ArcEngine,and realizes the automatic sending and receiving of SMS by multi thread technology.The system can be divided into the construction of database and the SMS transceiver module two,database module is used to generate the decision-making of grid data and model parameter data;SMS transceiver module is used for receiving the user location information,automatically return to the position and amount of fertilizer will be calculated to the user.The system can provide service for the Promotion Department of soil testing and fertilization at the county level.To sum up,the research conclusion of the paper is two parts: model establishment and system establishment.The establishment of the model is based on the quantitative relationship between soil nutrients,yield and fertilizer application,and a statistical model is established.On the basis of the amount of fertilizer,the positive correlation between the amount of fertilizer and the yield,and the negative correlation between the amount of fertilizer and the content of soil nutrients are established on the basis of the amount of fertilizer,and a positive and negative adjustment formula is established in a certain range.Applying this formula to model calculation can further reduce the scope of fertilization and achieve more precise recommended fertilization.With the combination of SMS system and 3S technology,the 3S technology is applied to the production practice directly,and the complex processes such as the next fertilization card are avoided and a lot of manpower and material resources have been saved.From the operational level,the research is of great significance for solving the last mile of soil testing and formulated fertilization.