Research: specific nutrient management for maize 
crop fertilizer recommendations economy of the dissemination to farmers and other interested parties. Most of the recommended fertilizers 
broadly. The use of fertilizers and fertilizer formulated specifically for each type or soil for each plant. The recommended fertilizer formula such as 15-15-15 and 16-20-0 mainly depends on the amount of fertilizer. Instructions from the trial. It is seen that such advice does not take into fertilizer nutrients contained in the original soil. The inefficient use of fertilizers Increased production costs And the resulting impact on the environment. The contamination Loss on foreign currency In the case of fertilizer than necessary. In the case where farmers use less fertilizer too. To make the soil less. Soil degradation The unsustainable farming Data from the use of fertilizers in the country that is currently used fertilizer per year, about three million tonnes of fertilizer imported from abroad. So if Thailand can farmers use fertilizers efficiently use fertilizer that plants need. And if possible reduce fertilizer use by at least 30% will save foreign currency out of the country up to 8,000-10,000 million baht per year, the majority of farmers in developing countries to analyze the soil to treat the room. State and private To get an accurate fertilizer recommendations. Make more efficient use of fertilizers. Soil analysis conducted by state agencies or private sector supplier of fertilizers to farmers. In many countries there is a problem or that there are not enough laboratories in planting. The demand of farmers analyze soil and do not keep pace with demand. Laboratories in most major cities and away from the plantation. It takes time and is costly to send soil samples to analyze. And what is most important Insufficient research data to guide the fertilizer to each plant to develop fertilizer recommendations 1. fertilizer production guidance information to guide fertilizer for plants. Space is limited in each of And very high costs of doing test plots. Advice fertilizer for plants grown in soil types. The same can not be transmitted to the ground in different places. The climate is not the same. In particular, rainfall, sunlight, because the farming of Thailand also rely on rain water is the most current international researchers have developed a program to calculate fertilizer for plants. By supposedly can yield maximum profit. And say how much fertilizer should be applied. And recommended planting dates for the One program that is known DSSAT which includes subroutines for each plant. Currently developing a plant with up to 15 species of maize simulator has been developed by the University of Hawaii in collaboration with other universities. In the United States, In the program there are three main types of database database database soil climate. And plant databases To advise corn fertilizer on the soil type. A place And a type of corn The program will calculate, using a database of soil types, locations, and types of maize varieties. The database of soil that has collected in the computer. This fertilizer recommendations Each production And extended to other soils where corn and other nutrients 2. Analysis Simulator crops. Only calculate nitrogen fertilizer only The hypotheses that have Phosphorus And potassium deficiency before the program calculates the amount of fertilizer to add to corn nitrogen in the soil will have to be analyzed first. The analysis in the form of organic carbon. When the input amount of organic carbon in the soil that is low or moderate, or high nitrogen fertilizer application will calculate how much that should be. The yield for maximum profit. Which is different in each clay soil. Each location and each species Research has updated guidance on the analysis of nitrogen nitrate instead of organic carbon. To be consistent with the results obtained by monitoring kit NP K, which measures the amount of nitrogen in the form of nitrate 3. Development of a monitoring NP K in the soil to bring the process to make fertilizer recommendations. Farmers use There will be problems with the determination of organic carbon in the soil. It must be done in a laboratory Therefore, it has developed a series of monitoring NP K in the soil by nitrogen has two ways to check the form of ammonium. And the form of nitrate. And phosphorus monitoring And potassium with They have been studied for a single solution that can extract nutrients NP K once and improving analysis of ammonium nitrate, phosphorus and potassium. Suitable for use in the field. The device was developed as a simple test kit NP K in the soil instead of reading tools in the operating room. By reading out a low, medium or high, and it takes only 30 minutes, the result has verified the accuracy of the standard color plate with laboratory instruments. And found that the accuracy is 90-95% in the case of ammonium nitrate and phosphorus, but the accuracy of reading the potassium with about 80% of it was also found that the amount of organic carbon are correlated with. The amount of nitrate in the soil. So, check the amount of nitrate in the soil. The test kits used NP K in the soil organic carbon analysis in the laboratory 4. Check the soil to plant simulator. Corn yield forecast And recommend specific soil nitrogen. Therefore, we have developed a system to monitor soil. The booklets provide checks on the ground. The inspection confirmed that the soil or not, which is only five physical characteristics such as color, texture, soil acidity - pH. The characteristics of the rough parts. And depths - shallow soil, etc. 5. advising corn fertilizer nitrogen recommendations before the plant simulator. Which was produced for each soil series. In each province Farmers must check the soil before that.
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