Generation digital management map for herbicide application in VRA spraying by using GPS

摘要

This study was conducted to develop a precision method of application for cyanazine, a pre-emergence herbicide which eventuates to save herbicide and reduce its adverse effects on the environment and agricultural products. For this purpose a digital management map (DMM) using the global positioning system (GPS) for variable rate application (VRA) was generated. Uncultivated field of about 6500 m2 wasudselected and local and universal transverse mercator (UTM) coordinates of the field were determined using total station surveying equipments and four static GPS receivers. Data processing was performed using a personal computer equipped with COMPASS software. Soil characteristics were determined by sampling and analyzing these samples. By considering manufacture recommendations for herbicide application based on soil organic matter content (OMC) and soil texture, four management zones with four different herbicide application rates as 1.4, 1.7, 2.9 and 3.5 L ha-1 were determined and eventually a DMM was generated. Usingudthe generated DMM and VRA, total required herbicide for the selected field was determined to be 1.6 L. Itudwas concluded that herbicide application can be decreased up to 13% in compared with a uniform herbicideudapplication rate for the entire selected field.