Mechanical Damage to Corn Seeds

Shahbazi, Feizollah; Shahbazi, Reza

doi:10.2478/cerce-2018-0021

Cited by 16 publications

(25 citation statements)

References 11 publications

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“…In this term, using the number of damage seeds as an index, OPV seeds were approximately 3 times more resistant to mechanical damage than the hybrid seeds. This is an indication that the genetic identity of the seed lots plays a significant role in determining the mechanical quality of the seed lots (Shahbazi and Shahbazi, 2018). Size of seeds used in this study did not influence the degree of seeds damage partly because grading was excluded from the processing activities (Ajayi et al, 2006).…”

Section: The Pattern Of Electrolyte Leakagementioning

confidence: 78%

“…This is because mechanization facilitates timeliness in seed production and minimizes production cost (Ajayi et al, 2006). The impact of damage does not only depend on processing operations, but also on velocity of impact, seed structural features, seed variety, seed type, seed moisture content, stage of ripeness, fertilization level and unsuitable equipment adjustment (Shahbazi and Shahbazi, 2018).…”

Section: Introduction Introduction Introduction Introductionmentioning

confidence: 99%

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Differential response of commercial hybrid and open pollinated maize seeds to mechanical damage during seed processing

Olisa¹,

Awosanmi

Akinropo

et al. 2021

Not Sci Biol

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Hybrids and open pollinated varieties (OPVs) are two commercial maize seed types cultivated in Nigeria. Information on their response to mechanical damage during processing is limited. This study is thus aimed at assessing the response of hybrids and OPVs of maize seeds to mechanical damage which would facilitate fabrication of processing facilities suitable for either of the maize types. Six maize varieties: three hybids (‘New Kaduna’, ‘SDM-1’, and ‘JO-195’) and three OPVs (‘Sammaz 15’, ‘Sammaz 27’ and ‘Suwan-1-stry’) were used for the study. The seed samples were subjected to standard germination, seedling vigour analysis, accelerated ageing, conductivity and fast green tests. The result showed that all the hybrid seed varieties had more damaged seeds than their OPVs counterpart. Shoot length and root length were more affected than other parts of the seedling. There were differences in the magnitude of electrolyte leakage as well as in what time each seed type (hybrid or OPVs) passed through the phases with ‘JO-195’ having the highest rate of electrolyte leakage. Hybrid seeds had lower resistance to mechanical damage and poorer storability when compared with the OPVs. In the overall, for all the traits, ‘Sammaz 15’, the best among OPVs was more promising when compared with ‘SDM-1’ which was the best among hybrid varieties. Processing machine equipment and accessories that are suitable for hybrid seeds might be inappropriate for conditioning OPVs.

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Section: The Pattern Of Electrolyte Leakagementioning

confidence: 78%

Section: Introduction Introduction Introduction Introductionmentioning

confidence: 99%

Differential response of commercial hybrid and open pollinated maize seeds to mechanical damage during seed processing

Olisa¹,

Awosanmi

Akinropo

et al. 2021

Not Sci Biol

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“…Mechanical damage to seeds due to impact does not only depend on the processing operation but also depends on the impact velocity [ 1 ], seed structural characteristics [ 2 , 3 ], seed variety [ 4 ], seed type [ 5 ], seed moisture [ 1 , 6 ], ripening stage, level of fertilization [ 7 , 8 ] and improper setting of the equipment [ 9 ]. Symptoms of mechanical damage to seeds may be in different forms [ 2 , 3 , 10 ]. External damage to seeds is easily visible, such as breakage and cracking of the seed.…”

Section: Introductionmentioning

confidence: 99%

Effects of cushion box and closed let-down ladder usage on damage to corn during handling: physiological deterioration

Shahbazi

2022

Plant Methods

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Background Corn seeds have a high susceptibility to mechanical damage due to their large size and mass. The main purpose of this study was to evaluate the effects of the cushion box and closed let-down ladder usage in minimizing the negative influence of the free fall on the storage potential of corn seeds. Corn seeds were evaluated for the extent of physiological damage by measuring the seed deterioration by the accelerated aging test (percentage loss in germination in the accelerated aging test), using three drop methods (free fall, with cushion box, and with closed let-down ladder) at three drop heights (5, 10, and 15 m) and five different moisture contents (10, 15, 20 and 25%). Results The drop methods had a significant effect on the storage potential of corn seeds. Sample seeds dropped without a ladder (free fall) had a significantly higher average physiological quality loss of 13.87% (loss in accelerated aging germination). In the use of the cushion box, the average percentage loss in germination was calculated to be 11.38%, which was decreased by about 18% more than the free fall. Sample seeds dropped with the closed let-down ladder had a lower average percentage loss in the germination of 8.78%, which showed that the closed let-down ladder significantly helped to reduce mechanical damage to corn seeds by about 37% comparing free fall and by about 23% to the use of the cushion box. The amounts of loss in physiological quality of corn seeds increased significantly with increasing drop height and moisture content, but the use of the cushion box and closed let-down ladder systems somewhat reduced the adverse effect of the above factors. Empirical models were developed for the dependency of physiological damage to corn seeds due to the impact caused by free fall, on the drop height and moisture content at different drop methods. Conclusions To minimize mechanical damage to seeds as they fall into the bin, a let-down ladder should be installed in the bin so that it can receive seeds from the filling spout with minimum damage.

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“…The moisture content of corn has a significant impact on the rate of broken grain (BGR) and the rate of uncleared grain (UGR) of direct grain harvesting [18,19]. BGR and UGR are the smallest when the grain moisture content is in the range of 15-25% [20].…”

Section: Characteristic Of High Moisture Content Cornmentioning

confidence: 99%

“…In combination with the ANOVA analysis results in Tables 5 and 6, the effect order of factors like the rotational speed of the cylinder, the clearance of the concave and the cylinder, and feed amount was consistent, just the degree of action was different. Considering the operation parameters of the threshing cylinder should be of as low rates of broken grain and uncleared grain as possible in Equation (18), the numerical optimization of the combination of parameters was a rotational speed of the threshing cylinder of 309.17 r/min, a concave clearance of 35.48 mm, and a feed amount of 6.13 kg/s. The BGR and UGR were 1.65% and 0.96%, respectively; this result still meets the requirement of the corn harvest standard.…”

Section: Verification Experimentsmentioning

confidence: 99%

Design, Simulation, and Test of a New Threshing Cylinder for High Moisture Content Corn

Guo

et al. 2020

Applied Sciences

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Corn harvesting mode has gradually changed from ear harvesting to direct grain harvesting. In view of the problems of high moisture content in corn harvesting in China, such as the rates of broken grains (BGR) and uncleared grains (UGR) being too high, a new single longitudinal axial threshing cylinder was designed, which mainly included a cylinder spindle, a spiral feeding inlet, a T-type rasp bar, a separating straight rod, and a spiral extracting rod. Firstly, the three states of grain during the threshing process and the key influence factors of threshing and force analysis of corn ears in the threshing device were analyzed, then the structure of the threshing cylinder was designed, and its parameters were determined by theoretical analysis results. The arrangement mode of threshing elements adopted a combination of a T-type rasp bar, a separating straight rod, and a spiral extracting rod with a 6-head spiral pattern and an arrangement step of 250 mm. Secondly, the arrangement step of threshing elements was determined by discrete element method solution (DEM) simulation; the result showed that the average movement velocity was 55.04 m/s and the threshing time was 6–8 s. Finally, a multiple factors experiment of the threshing device was carried out, and the result showed that the order of the effect factors of the BGR and UGR was cylinder rotational speed > concave clearance > feed amount. When cylinder rotational speed was 309.17 r/min, concave clearance was 35.48 mm, and the feed amount was 6.13 kg/s. The verification experiment result showed that the BGR and UGR were 1.24% and 1.33%, respectively, which meet standard requirements. The research results could provide a reference for the design of a high moisture content grain threshing device and combine harvester.

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Mechanical Damage to Corn Seeds

Cited by 16 publications

References 11 publications

Differential response of commercial hybrid and open pollinated maize seeds to mechanical damage during seed processing

Differential response of commercial hybrid and open pollinated maize seeds to mechanical damage during seed processing

Effects of cushion box and closed let-down ladder usage on damage to corn during handling: physiological deterioration

Design, Simulation, and Test of a New Threshing Cylinder for High Moisture Content Corn

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