Development of Powered Groundnut Harvester for Small and Medium Holdings in North Kordofan State in Western Sudan
1Department of Agricultural Engineering, Faculty of Natural Resources, University of Kordofan, Elobied, Sudan
2Department of Crop Sciences, Faculty of Natural Resources, University of Kordofan, Elobied, Sudan, P.O. 160.
3Department of Agric. Eng., Faculty of Agriculture, University of Khartoum, Sudan
4Ministry of Agriculture of North Kordofan State, Elobied, Sudan
A Powered groundnut harvesting machine was designed and fabricated. The optimum machine diggers were selected using computer simulation method in ANSYS 11 program. The machine was tested in sandy and clayey sand soil. It was found that the effective time and total time recorded by the machine in sandy soil were lower than in clayey sand soil by 0.050 hr. Fuel consumption rate in sandy soil was lower than that in clayey sand soil by 0.7 L / ha. Machine field speed in sandy soil was higher than speed in clayey sand soil by 0.69 km / hr, it was also found that the values of machine theoretical field capacity, effective field capacity in sandy soil were higher than the values in clayey sand soil by 0.061 ha / h and 0.048 ha / h respectively while field efficiency in clayey sand soil was higher than that in sandy soil by 1.2 %. The differences were significant at 0.05 level and it can be concluded that the machine is efficient in harvesting the groundnut crop particularly in clayey sand soil. Hydraulic system and gear box were needed to enhance maneuverability and to control the digging speed of the machine.
At a glance: Figures
Keywords: groundnut harvester, digger simulation, root crops harvesting
World Journal of Agricultural Research, 2014 2 (3),
Received May 06, 2014; Revised May 09, 2014; Accepted May 11, 2014Copyright © 2014 Science and Education Publishing. All Rights Reserved.
Cite this article:
- Zaied, Moayad B., et al. "Development of Powered Groundnut Harvester for Small and Medium Holdings in North Kordofan State in Western Sudan." World Journal of Agricultural Research 2.3 (2014): 119-123.
- Zaied, M. B. , Naim, A. M. E. , Dahab, M. H. , & Mahgoub, A. S. (2014). Development of Powered Groundnut Harvester for Small and Medium Holdings in North Kordofan State in Western Sudan. World Journal of Agricultural Research, 2(3), 119-123.
- Zaied, Moayad B., Ahmed M. El Naim, Mohammed H. Dahab, and Afraa S. Mahgoub. "Development of Powered Groundnut Harvester for Small and Medium Holdings in North Kordofan State in Western Sudan." World Journal of Agricultural Research 2, no. 3 (2014): 119-123.
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Groundnut is major root oil crop and main source of edible oil in the Sudan as well as sesame, cottonseed, and more recently sunflower. Groundnut (Arachis hypogaea L.,) is a native South American legume not known to the Old World in pre-Columbian times. Portuguese navigators are credited with introducing the crop to the western coast of Africa from Brazil, but it is not known when. West African immigrants are believed to have brought the crop to Sudan about 200 years ago, and they grew it in parts of western Sudan and along the Blue Nile. Documentation, however, is lacking . The earliest forms of groundnut introduced belonged to the subspecies hypogaea. The small-seeded runner types were established on the sandy soils of western Sudan and the bunch types were grown along the Blue Nile on heavy clays. These two groups of groundnut form the land varieties in Sudan. Varieties of the subspecies fastigiata (varieties vulgaris and fastigiata) were introduced about sixty years ago as part of an improvement programme. Of these fastigiata introductions, the cultivar Barberton, primarily because of its early maturity, quickly replaced the late maturing land varieties of the runner type in the northern parts of Kordofan and Darfur .
The digger-shaker-windrower is used to lift groundnuts and detach them from the soil. Dig deep enough to prevent cutting pegs. Windrow-inverting attachments orient plants as they leave the shaker so pods are primarily on the top of windrows to permit greater air circulation and exposure to sunlight for a shorter drying time.
Mizrach et al  carried out a design of machine for digging, picking up, and separating peanut. The technique of machine used depended upon cutting the soil with peanut, plant and elevates all on screen with space equal 10.5 mm between the rods to loosen the soil. Japanese Trade Policy Inst. designed a vibrating potato digger, which named NIP/O. P.S.  The machine of one row had a little draft resistance. Ahmed and Shamsudeen  Developed a prototype tractor - operated groundnut digger lifter. Amin  developed a vibrating potato digger having field capacity of 0.31 fed / h, while field efficiency was 91.32 % at forward speed of 2.1 km/h and harvesting a feddan of 250 m. length.
Magdy  stated that vibrating shares and separating table leads directly to reduce the required draft and increases the performance efficiency. Kang and Halderson  designed a two-row, three-point-hitch vibrating digger. Each row compared a pair of four-bar linkages to which two side plates are attached. A bottom plate for each row composed of a soil-digging blade, followed by soil –sieving bars. These bars were rigidly attached to bottom of each pair of side plates to cut and lift the soil and also to allow for soil separation. The motion of the bottom plate was also designed to assist with soil flow. Ademilyi  evaluated performance of a tractor drawn groundnut digger/shaker. Kad et al evaluated a performance of a developed digger that can relieve the farmer from fatigues work of hand pulling of groundnut pod and saved 11 to 13 per cent pods. The test results indicated that effective field capacity of the digger as 0.256 ha/day, with 87.98 per cent digging efficiency. Ibrahim et al.  developed a multi purpose digger for root crops. The machine was operated efficiently for potato at 22 cm harvesting depth, 2.6 km / h forward speed and 0.31 rad (18 deg) tilt angle with using vibrating movement and for peanut 15 cm harvesting depth, 2.3 km / h forward speed and 0.21 rad (12 deg) tilt angle with using vibrating movement. Munde et al  evaluated a performance of bullock drawn groundnut digger suitable for multi purpose tool carrier multipurpose tool carrier. They found that its field capacity was 0.126 ha / hr with field efficiency of 80.25% at an operating speed of 2.1 kmph. It performed the harvesting operation with a total pod loss of 8.01% and digging efficiency 92 per cent. With this digger, the cost of operation was Rs.168.30/ha for groundnut harvesting. Zhengzhou  demonstrated a peanut harvester which is mainly used for harvesting peanut, garlic, sweet potato, potato and other crops under the ground. Gary  mentioned numbers of tractor operated peanut diggers. The objective of the present work is to design and fabricate a powered groundnut harvester for small and medium size farms in North Kordofan State in Western Sudan and test its field performance in two soil types in the province.
2. Materials and Method2.1. Materials
Materials used to conduct the present research are listed bellow
3. One cylinder internal combustion engine.
4. Power transmission differential system.
5. Steel angle bars.
6. Mild steel sheets.
8. Circular section steel bars.
9. Spur gears.
10. Steel chains.
11. Rubber wheels.
12. Bolts, nuts and screws.
13. Metering tape.
14. Stop watch.
15. Petrol fuel.
16. Groundnut seeds.2.2 Method
2.2.1. Computer Simulation
188.8.131.52. Modeling of Diggers
Two spear like diggers, one with 25 cm length and 12.5 cm rear base width and the other with 20 cm length and 10 cm base width (Figure 1 and Figure 2), were modeled in ANSYS 11 program.
184.108.40.206. Material Definition for Mesh Generation
Since digger material is 1020 steel which characterized by plasticity, stress stiffening, large deflection and large strain capability, solid 45, 8 nodes element type and elastic isotropic material model were used for meshing.
220.127.116.11 Boundary Conditions
Digger model was constrained at its top rear end and its upper surface was subjected to arbitrary load of 100 kPa.
18.104.22.168. Solution for Boundary Problem and Post-Processing
The reaction of digger is linear problem, so, the contour plot was read and the principal stress in X direction and shear stress in XZ plane were recorded for each digger design and the output of simulation were demonstrated in Figure 3, Figure 4, Figure 5, Figure 6 and Table 1.
2.2.2. Machine Fabrication
The results of computer simulation in Table 1 showed that the optimum dimensions of digger that demonstrated the lowest stresses distribution were 20 cm length and 10 cm base width, therefore, these dimensions were adopted to manufacture the machine diggers. The machine with specifications in Table 2 was fabricated in a workshop of agricultural machineries in Elobied Industrial Area. The machine and motion transmission system part and dimensions were shown in Figure 7 and Figure 8 (a and b)
2.2.3. Soil Test
Soil samples were taken from two different locations in North Kordofan State at depth 30 cm, the moisture content on dry base and soil bulk density for the samples were determined. Tri-axial soil test apparatus and shear box were used to measure soil cohesion and internal angle of friction, while soil adhesion measurement apparatus was used to determine soil adhesion pressure with steel and the soil physical and mechanical properties were shown in Table 1.
2.2.4. Measurements of Field Performance Parameters
The field work was conducted in two the locations, the experiment was carried out in 8 plots grown with groundnut in each location, the area of the plot was 100 m x 4.6 m.
22.214.171.124. Measurement of Time
The machine was operated in the plot and the time was recorded using stop watch. The turning time at ends of the plot was determined.
Total time was computed by adding effective time to turning time and other field stops time.
126.96.36.199. Fuel Consumption Measurement
The fuel consumption rate was detected as follows:
The machine started working the plot with full tank, after finishing the plot, the tank was refilled using measuring cylinder. The amount of fuel used to refill the fuel tank was recorded. The fuel consumption rate was calculated as follows:
FCR = fuel consumption rate, L / ha.
CR = reading of cylinder, ml.
A = area, m2.
C1 = conversion factor, .
188.8.131.52 Measurement of Speed
The digging velocity was the calculated as follow
S = digging speed, km / h.
D = travelling distance, m.
t = time, s.
C2 = conversion factor, [3.6].
184.108.40.206. Measurement of Theoretical Field Capacity
Theoretical field capacity in each plot was computed using the following equation
TFC = theoretical field capacity, ha/h.
S = digging speed, km / h.
W = working width, m.
C3 = conversion factor, .
220.127.116.11. Measurement of Effective Field Capacity
Effective field capacity was calculated as follows
EFC = effective field capacity, ha/h.
A = plot area, m2.
T = time, sec.
C4 = conversion factor, [0.36].
18.104.22.168. Measurement of Field Efficiency
3. Results and Discussion
The views and motion transmission system of the fabricated harvesting machine were shown in Plate 1, Plate 2 and Plate 3. Field time and fuel consumption rate were demonstrated in Table 4 while field speed, field capacities and efficiency were shown in Table 5.
Table 4 showed that the effective time and total time recorded by the machine in sandy soil were lower than effective time and total time recorded in clayey sand soil by 0.050 hr. It was also demonstrated that fuel consumption rate in sandy soil was lower than that in clayey sand soil by 0.7 L / ha. Since the clayey sand soil is characterized by higher bulk density, cohesion and adhesion force as compared to sandy soil, therefore, the field time and fuel consumption rate in clayey soil were higher than in sandy soil and the differences between soil types were found to be significant at 0.05 level.
Machine field speed (Table 5) in sandy soil was higher than speed in clayey sand soil by 0.69 km / hr, the lower speed in clayey sand soil may be due to higher resistance force resulted form higher shear strength of that cohesive soil which increased the wheel slippage as compared to sandy soil. it was also found that the values of machine theoretical field capacity, effective field capacity (Table 5) in sandy soil were higher than the values in clayey sand soil by 0.061 ha / h and 0.048 ha / h respectively while field efficiency in clayey sand soil was higher than that in sandy soil by 1.2 %, the differences were significant at 0.05 level. Amin  developed a vibrating potato digger having field capacity of 0.31 fed / h, while field efficiency was 91.32 % at forward speed of 2.1 km/h and harvesting a feddan of 250 m. length. Magdy  stated that vibrating shares and separating table leads directly to reduce the required draft and increases the performance efficiency. A multi purpose digger developed by Ibrahim et al.  for root crops. The machine was operated efficiently for potato at 22 cm harvesting depth, 2.6 km / h forward speed and 0.31 rad ( 18 deg) tilt angle with using vibrating movement and for peanut 15 cm harvesting depth, 2.3 km / h forward speed and 0.21 rad (12 deg) tilt angle with using vibrating movement. It was deduced that it is not necessary to have a higher speed to obtain a higher field efficiency, it is known that the higher speed will reduce the total field time a thing which increases the effective field capacity but at the same time the theoretical field capacity will increase, therefore, field efficiency may reduced.
It can be concluded that the machine is effective in harvesting the groundnut crop particularly in clayey sand soil.
Self propelled groundnut harvesting machine was designed, fabricated and tested in sandy and clayey sand soil. Computer simulation method was applied to select the optimum design of machine diggers before been fabricated. The machine can be used to harvest root crops other than groundnut. The drudgery of field work will be reduced and labor shortage problem in the State will be overcome by the machine. The field efficiency of the machine in clayey sand soil is higher than in sandy soil but in clayey sand soil the machine consumed more fuel.
The machine is needed to be equipped with a hydraulic system as well as gear box to enhance its maneuverability and to control the digging speed.
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