| Precision Agriculture is the main trend of global agriculture envelopments in 21st century,which can increase the use factor of the fertilizer,reduce the environment pollution; which can also improve the benefits of the economy,the environment and the zoology of fertilization plot. Variable rate fertilization is one important aspect of the Precision Agriculture system . The research discussed the approach of Precision Fertilization in the country of the china, which was based on GIS and GPS and used the peasant plot as the unit. The research is based on the advanced succeed experience of variable rate fertilization ,which was used the best GIS software–ARCGIS and the research method -ordinary Kriging interpolation method recognized that is a recognized and the best method to research the soil nutrient space variation. The Ordinary Kriging interpolation method can create the soil nutrient space variation map. The figure is smooth and the result is exact. The soil nutrient space variation map offers a credible data and makes the base data of variable rate fertilization no doubt. At the same time the data was used to research the recommendation prescription by the unit of peasant land, which was based on the recommendation fertilization technology of Agriculture Expert System at a large scale on south china country. Recommendation fertilization information query system was developed by Visual Basic 6.0 and COM-Mapgis6.5SDK in this paper. Which was developed by the face-object-technique programme language and the ComGIS that mean the groupware geography information system, for supporting the query and use of recommendation fertilization? There are some important conclusions educed from this paper:Firstly, pH,organic matter and total nitrogen accord with normal school and the trend parameter accord with no-rank in those five soil characteristics .The available p and the available k accord with the logarithm normal school and the trend parameter accord with two-ranks .Secondly, The sequence from max to min of the space aberrance variation is that Available pH,the available k,total nitrogen,organic matter,pH, which are related mainly with the soil fountainhead and the soil fertilization habit. The reason of pH is brought by the the soil fountainhead and the soil fertilization habit. The variation of total nitrogen and organic matter, which are related mainly with the the soil fountainhead and the soil fertilization habit. The little variation of the kalium is because that the kalium fluxion is great. The little variation of the phosphor is strong related the fertilization habit.Thirdly, the fit model of those soil characters is the spherical. The proportion between the nugget and the sill of the available p and the available k is less than 25 percent, which means both soil characters have strong space relativity for the inhuman factors such as the soil fountainhead,the terrain,climate. The proportion between the nugget and the sill of total nitrogen and organic matter between 25 percent and 75 percent, which means both soil characters have middling space relativity caused by soil fountainhead and human activity. The proportion between the nugget and the sill of pH exceeded 75 percent which means both soil characters space relativity caused mainly by human activity. The pH space variation direction is accorded with the road because the calcareousness powder pervasion which was used to build the road. The more near the road, the more high the pH. The sequence from max to min of the range is that pH,organic matter,total nitrogen,available k,,available p ,even the range of available p is more than the sampling interval which means it is up to the mustardFourth, the mutuality correlation modulus between organic matter and total nitrogen reached the best salience, which means the total nitrogen had a high correlation with organic matter. The pH had a high correlation with the organic matter,and the available p. The available k had a high correlation with the altitude.Fifth, the Kriging Interpolation result indicates that the changing extension of total nitrogen between 0.84‰-1.933‰, most areas reached 1.06‰.The space variation of the total nitrogen is slow, but the east-north of research area is obvious. The changing extension of available p between 1.0mg/kg-62.0 mg/kg, the space variation of the p is complexity .The east of research area lacks the available p and need p fertilizer, but the west-south does not need it. The changing extension of available k between 39.0mg/kg-135.0 mg/kg and the space variation of the k is complexity. The mostly research area lacks the available k. It had a high correlation with the local fertilization habit. The soil needs the k fertilizer.Sixth, A farmer recommendation fertilization query system was developed by query Visual Basic and COM-MAPGIS, which would support the query and the use of precision Agriculture.In conclusion, this paper bring forward the way of precision fertilization which not only considers the continuity and the variability of soil space but also adopts the recommendation fertilization system that bases on the soil nutrient Correlation coefficient by many years fertilizer experimentation . This method is not only advanced in technology but also doable in economy. It will have some direction meanings for application of precision agriculture technique in china as unit of peasant land. |
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