Further development of a modified chisel plow and studying : (B)‎ : its specific and equivalent energies and its energy utilization

الملخص EN

A chisel plow of five blades arranged in to rows was modified by adding two rotors.

The rotors were provided with blades to break the soil clods up.

It was further developed by adding seven tines arranged in one row.

The tines were fixed between the two rotors.

The tines were inclined forward to push the soil colds at depth toward the soil surface to expose them to the blades of the rear rotors.

The modified chisel plow was tested in the field after the new modification.

The parameters of the experiments are three operating depths (10, 15 and 20cm) and three forward speeds (0.34, 0.53 and 0.90m / sec).

These parameters were» used with four chisel plow combinations namely CP, CP + 2R, CP + CU and CP + CU + 2R.

The results showed that the specific energy of CP+CU+2R (with tines) is higher than the other plow combinations.

The tines required 49.68, 32.18 and 28.98kJ / m3which composed 42.50, 35 and 33 %, from the total of the specific energy requirement of CP + CU + 2R at operating depth of 10, 15 and 20cm respectively.

The specific energy of the tines increased with forward speed.

There specific energy requirement at lower and higher forward speeds (0.34 and 0.90m/sec) are 31.68kJ / m3 and 41.17kJ / m3 which composed 37 % and 37.5 % from the total energy requirement respectively while for the forward speed of 0.53 is medium.

The equivalent energy of the plow decreased as the operating depth increased.

When the operating depth of the tines increased from 10 to 20cm, there equivalent energy improved by amount of 24.07kJ / m3.

The equivalent energy increased as the forward speed increased.

The addition of tines to the plow increased the equivalent energy by 37.96kJ / m3 when the forward speed increased from 0.34 to 0.90m / sec.

The energy utilization efficiency of CP + CU + 2R decreased from 79.43 % to 71.81 % when the operating depth increased from 10 to 20cm.

The energy utilization efficiency improved considerable when the plow was provided with tines, it increased from 56.12 % without tines to 71.81kJ / m3 with tines (CP + CU + 2R) at operating depth of 20cm and improved further to 79.73 % at operating depths of 10cm.

The energy utilization efficiency of CP + CU + 2R increased from 73.16 % to 86.47 % when the forward speed increased from 0.34 to 0.90m / sec.