FIELD PERFORMANCE EVALUATION OF A SUBSOIL PLOW WITH ADDED SMOOTH AND GROOVED DISC BLADES BASED ON SELECTED INDICATORS

Abstract

The study was conducted to evaluate the addition of the disc blade in two forms, which was made to the underground plow in February for the spring season of the year 2024. The experiment was conducted in two locations: the first in the southeast of Baghdad Governorate in Al-Mada’in District / Al-Ja’ara village and (the second) in the north of Baghdad Governorate in Al-Rashidiya District / Victory Village The study included the shape of the blades used and three levels without a blade: a locally manufactured smooth blade, a locally manufactured sectional blade, two levels of clay and clay mixture soil texture, and two levels of plowing depths of 35 and 45 cm, and the effect of this on field indicators, including the traction capacity, the depth achieved, the area raised, and the specific resistance to traction. The experiment was carried out. According to a randomized block design Complete (RCBD) with split plate system - split. Duncan's multiple range test was used at the probability level (0.05) to test the significance of the differences between the means of the different treatments. The two experimental sites were land cultivated for previous seasons, and the experimental field area in both sites was 2500 m². The topography of the two sites was aracterized by flat surfaces and different soil textures. The results showed the superiority of the clay mixture soil texture by recording the lowest value for each of the indicators of traction capacity and specific resistance to traction compared to the clay soil texture. The results showed that the first depth of 35 cm had a significant impact as it gave the lowest value for the traction capacity index while the second depth of 45 cm gave the highest value for each of the depths. The achieved area, the area raised, and the lowest value of the specific drag resistance index. The results concluded that the use of the locally manufactured sectioned disc blade recorded the lowest value for both the indicators of pulling capacity and specific resistance to drag, while the highest value was recorded for both the indicators of depth achieved and the area raised compared to the use of the plow without a blade or the smooth disc blade manufactured locally. While the results of the interaction of soil texture and plowing depth showed a significant effect on the character of the traction capacity, the lowest value was recorded when the binary overlap between the texture of the clay mixture soil and the first depth of 35 cm. The interaction of the soil texture and the shape of the blade recorded a significant effect on both the traction capacity, the depth achieved, and the area of ​​the soil stirred, and it was recorded as the best. Values ​​for the traction capacity, the aroused area, and the depth achieved when the two intersect between the texture of the clay mixture soil. And use a disc-cut blade The results of the three-way interaction between soil texture, plowing depth, and blade shape also showed a significant effect on the character of the area raised, and the lowest value was recorded when the two-way interaction between the texture of the clay mixture soil, the second depth of 45 cm, and the use of a locally manufactured disc-cut blade.