Abstract:In order to study the distribution and influential factors of available contents of soil macronutrients in Weifang City, Shandong Province, the grid sampling and analysis test were carried out. The total and available contents of soil macronutrients such as N, P and K, as well as pH and organic matter were measured. The spatial maps of abundance and deficiency in these soil indexes were drawn, and their correlation and difference were analyzed. The results show that the contents of alkali-hydrolyzed nitrogen (AN), available phosphorus (AP) and available potassium (AK) have strong spatial variability, especially variation coefficient of AP is the highest. In terms of spatial distribution, the relatively lack area of AN has the highest proportion, and the rich areas of AP and AK have the highest proportions. AN content is significantly higher in Shajiang black soil, AP content is significantly higher in fluvo-aquic soil, while AK content is significantly higher in coastal saline soil. AN, AP and AK are closely related to soil physiochemical indexes, which are significantly positively correlated with organic matter. There is significant positive correlation between AN and total nitrogen, AP and total phosphorus. AN and AP are significantly negatively correlated with pH, while AK is significantly positively correlated with pH. These results reveal the background difference and influencing factors of available contents of soil macronutrients, which can guide the spatial regulation of soil fertility and help to improve the level of agricultural productivity.