| The soil fertility condition is the important factor,which affects tobacco output and quality.In this study, we took 46 (0～20cm)points using global positioning system to define sample locations in Jia xian County, Pingdingshan, in March 2009. Soil chemical properties were analyzed and their spatial variability was assessed by geostatistical techniques. Considering that most of soil properties are often related, principal component analysis (PCA) was used to summarize soil propertied into a few meaningful components (PC), which were further used to delineate management zones by fuzzy cluster algorithms. The main research results were as follows:Soil OM, AN and AP contents are low, AK is high; Available Fe is very poor, Available Mn, Cu and Zn contents is moderate. In addition to AK, all the nutrient properties of soil are negatively correlated with pH. So,we can reduce the soil pH to enhance the nutrient content and effectiveness; AN and AP, Mn, Cu was not significant correlation; soil OM and other nutrients have significant correlation, suggesting that increased soil OM content to improve the content of the other nutrients.Tthrough 46 soil samples analysis of variance showed that all nutrients are semi-variogram, soil pH, AP Nugget / sill [C0/C0 + C] was 22.9% and 23.7%, was smaller than 25%.It could be seen that the spatial variability of hydrogen manifested for the strong relevance,it said that the constitutive factors played the main role in arising the spatial non-uniformity,that is,the spatial variability of soil hydrogen mainly relied on the cultivation,the management measure,the planter system and the pollution etc.The ratio of nugget value to soil value of soil OM and AK were 29.5% and 30.9%.They belonged to median correlation in space,their spatial variability resulted from the effect of the constitutive factor and the random factor together.The ratio of nugget value to soil value[C0/C0 + C]was Fe,Mn,Cu and Zn ranged from 25% to 75%,it had the medium spatial relevance.Soil PH ranged from 5.5 to 6.5 were suitable for tobacco , it was at the high levels on the study area. OM and AN showed a strong similarity of distribution trends, the relatively high content distributed in the southwest, while the central part of the relatively low OM content. Production of high quality tobacco optimum AN for the 25～45 mg kg-1, that are more conducive to nitrogen regulation. The spatial pattern of AP were agglomerate that mainly affected by pH and OM, such as random factors on human factors have greater impact. AP contents of 8. 42～9.78 mg ? kg-1 of the largest areas and accounts for 40% of the total area;Mainly in the southern region, AP low in the study area is mainly located in the southwest and central.AK content of 146.36～161.61 mg ? kg-1 area of the largest and accounts for 41% of the total area;mainly in the northern and western region, the content of 118.03～146.36 mg ? kg-1 of the second, accounting for 38% of the total area, mainly in the southern and central region.Soil of Fe,Mn,Cu,Zn contents of the interpolation maps of spatial distribution.Soil Fe contents in the lower north to south showing the distribution of trends, Mn contents state of the distribution of Fe showed the opposite trend. Cu and Zn are more similar to the distribution are as follows: in the southeast and northwest of the low side, in the southern and northern high trend. As the soil available Mn, Cu and Zn content in medium and therefore should be proper control of these trace elements in fertilizer application. So as to avoid the waste of fertilizer. Fe contents distribution is relatively low, the actual situation can be properly combined to add fertilizer. |
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