GIS-Supported Precision Agricultural Fertilization Management at Small Scale

摘要

Precision agricultural fertilization technique at small scale is the key for regional cultivated land protection and management. Taking Dingzhuang Town (located in Guangrao County, Shandong Province) as a case study, this article explores the precision agricultural fertilization technique at small scale. First, three main cropping systems are identified via field investigation, namely "wheat–maize–soybean", "garlic–maize" and "cotton". Then, application amount of fertilizer N, P and K under the three cropping systems is calculated on the parameters acquired through field experiment, using nutrient balance approach on the support of geographic information system technique. The results indicate that, precision agricultural fertilization technique at small scale take on different characteristics compared with that at larger scale. The spatial distribution of soil nutrients in Dingzhuang Town is out of equilibrium, and huge amount fertilizer is needed to satisfy local agricultural production. There is huge distinction of fertilizer ap- plication amount under different cropping systems. The demand of fertilizer amount under "wheat–maize–soybean" system is larger than that under "garlic–maize" and "cotton" systems. This study can provide theories and principles for regional precision agricul- tural fertilization management.