الفهرس 
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Abstract
This study aimed to : This research to is develop a fertilizing implement to added a precision fertilizer using the electronic circuit. To achieve of the aim of this research the following steps were done :
1- Study the nitrogen fertilizer properties.
2- Construction the electrical circuit to control the adding time and the fertilizing gate.
3- Construction the fertilizer implement with two units, the conventional and developed units. Each fertilizer units consists of main parts namely, hopper, gate, controller of gate area, furrow opener, covered wheel and fertilizing tube beside the secondary and main frames and the hitching point.
4- Calibrate the developed and original fertilizing implement. The laboratory experiments of original and developed fertilizer units variables include ; forward speeds (F) of 3.38, 4.37, 4.79 and 6.70 km/h, setting gate areas (Ga) of 6.250, 12.500, 18.750 and 25.000cm2, running times of discharge (Ta) of 60, 90, 120 and 150 sec and hopper capacity (Ch) of 25, 30 and 35 kg (head of fertilizer 46, 54and 63 cm).
5- Evaluate the implement units performance at :
a- The conventional unit at variables of : forward speeds of 3.38, 4.37, 4.79 and 6.70 km/h at the fixed gate area suitable for the recommended nitrogen discharge of maize crop.
b- The developed unit at variables of: forward speeds of 3.38, 4.37, 4.79 and 6.70 km/h at variable gate area as summation of soil nitrogen fertility with subtract it recommended amount of nitrogen fertilizer. To evaluation of implement units the measurements were :
1- Pre- experiment to determine the amount of nitrogen in soil and draw soil map.
2- The implement calibration.3- The field experiments measurements: soil content from N2 ; N2 adding in soil at three positions for each gate areas; fuel consumption ; field efficiency; specific energy and cost estimation. from the obtained results it can be concluded that using the developed fertilizer unit ; which controlled the on/off gate by an electronic system as a variable rate technique ; saved an amount of fertilizer of about 56.8 kg/fed and total costs about 209.36 LE/fed at forward speed of 4.79 km/h. For future work on this point, the author suggests more modifications on the developed system to be used on a large scale.