A Mastercurve to predict annual ryegrass (Lolium rigidum) seed devitalisation when exposed to multiple single sided impacts

Berry, Nicholas K.; Fielke, John M.; Saunders, Chris

doi:10.1016/j.biosystemseng.2015.02.015

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…in the absence of chaff, produced lower levels of seed kill than have subsequently been achieved with impact mills. Despite the differences in size, configuration, and operational speeds between the cage mill and the iHSD mill, both act by impacting weed seeds against steel bars (Berry et al 2015). Thus, despite the presence of high amounts of chaff material, this impact action is sufficient to render nonviable the vast majority of weed seeds passing through these mills.…”

Section: Resultsmentioning

confidence: 99%

iHSD Mill Efficacy on the Seeds of Australian Cropping System Weeds

2017

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In Australia, widespread evolution of multi-resistant weed populations has driven the development and adoption of harvest weed seed control (HWSC). However, due to incompatibility of commonly used HWSC systems with highly productive conservation cropping systems, better HWSC systems are in demand. This study aimed to evaluate the efficacy of the integrated Harrington Seed Destructor (iHSD) mill on the seeds of Australia’s major crop weeds during wheat chaff processing. Also examined were the impacts of chaff type and moisture content on weed seed destruction efficacy. Initially, the iHSD mill speed of 3,000 rpm was identified as the most effective at destroying rigid ryegrass seeds present in wheat chaff. Subsequent testing determined that the iHSD mill was highly effective (>95% seed kill) on all Australian crop weeds examined. Rigid ryegrass seed kill was found to be highest for lupin chaff and lowest in barley, with wheat and canola chaff intermediate. Similarly, wheat chaff moisture reduced rigid ryegrass seed kill when moisture level exceeded 12%. The broad potential of the iHSD mill was evident, in that the reductions in efficacy due to wide-ranging differences in chaff type and moisture content were relatively small (≤10%). The results from these studies confirm the high efficacy and widespread suitability of the iHSD for use in Australian crop production systems. Additionally, as this system allows the conservation of all harvest residues, it is the best HWSC technique for conservation cropping systems.

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Section: Resultsmentioning

confidence: 99%

iHSD Mill Efficacy on the Seeds of Australian Cropping System Weeds

2017

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“…Control of the larger seeds (wild oat and brome grass: 99%) was greater than for wild radish (93%) due to its protective, hard silique (Walsh et al 2012). Other factors have been suggested to affect weed seed control with impact implements like the HSD, such as the impact speed (RPM), number of impacts, seed size, weed species, seed strength, seed natural defenses, moisture content, and chaff type, among others (Berry et al 2015; Walsh et al 2012). Understanding how crop and weed seed factors affect HSD efficacy will increase understanding of potential suitability of the HSD in new agroecoregions.…”

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confidence: 99%

Factors Affecting Weed Seed Devitalization with the Harrington Seed Destructor

Tidemann

Hall

Harker³

et al. 2017

Weed Sci

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The Harrington Seed Destructor (HSD), a novel weed control technology, has been highly effective in Australian cropping systems. To investigate its applicability to conditions in western Canada, stationary threshing was conducted to determine the impact of weed species, seed size, seed number, chaff load, and chaff type on efficacy of seed destruction. Control varied depending on species, with a range of 97.7% to 99.8%. Sieve-sized volunteer canola seed had a linear relationship of increasing control with increasing 1,000-seed weight. However, with greater than 98% control across all tested seed weights, it is unlikely that seed size alone will significantly influence control. Consistently high levels of control were observed at all tested seed densities (10 seeds to 1 million seeds). The response of weed seed control to chaff load was quadratic, but a narrow range of consistently high control (>97%) was again observed. Chaff type had a significant effect on weed seed control (98% to 98.6%); however, seed control values in canola chaff were likely confounded by a background presence of volunteer canola. Overall, the five parameters studied statistically influence control of weed seeds with the HSD. However, small differences between treatments are unlikely to affect the biological impact of the machine, which provides high levels of control for those weed seeds that can be introduced into the harvester.

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“…Accordingly, young coconut fruit was found to be much more susceptible to bruising under impact than under compression based on the variations in the minimum energy level required to bruise the fruit. Berry et al reported that weed seed devitalization increased with the number of impacts, the impact speed and decreasing moisture content, as well as a threshold minimum energy per impact was 0.3991 kJ•kg −1 [20]. Bao et al determined that the impact deformation energy of blueberry reached a minimum, while the fruit was theoretically free from damage when the distance between the blueberry growing concentration area and grafting plate was close to 600 mm, while the tilt angle of the grafting plate was close to 15 • [21].…”

Section: Introductionmentioning

confidence: 99%

Development and Evaluation of Low-Damage Maize Snapping Mechanism Based on Deformation Energy Conversion

Zhang

Geng

2021

Applied Sciences

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Reducing ear damage is the key to improving the quality of maize harvests. In order to reduce the impact and damage of the ear caused by the ear snapping mechanism, this paper proposes a method to convert ear deformation energy during collision into elastic potential energy in the ear snapping mechanism. According to the above method, a low-damage maize snapping mechanism was designed. In order to verify the feasibility of energy conversion in reducing damage, the dynamic model of the contact between the ear and the snapping plate was established, and a dynamic simulation analysis was carried out based on the finite element method (FEM). In order to obtain better parameters for the improved mechanism, a test rig was established, after which a performance test was carried out on the test rig. The results showed that the primary and secondary order that affected the ear damage rate was the rotational speed of the snapping roller, the spring stiffness and the forward speed. The data processing software Design Expert was used to optimize the parameters, it was concluded that when the rotational speed was 805 r·min−1, the forward speed was 1.29 m·s−1, the spring stiffness was 33.5 N·mm−1, the model predicted that the ear damage rate was 0.023%. Therefore, this paper could provide further reference for research into maize low-damage ear snapping technology.

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A Mastercurve to predict annual ryegrass (Lolium rigidum) seed devitalisation when exposed to multiple single sided impacts

Cited by 4 publications

References 31 publications

iHSD Mill Efficacy on the Seeds of Australian Cropping System Weeds

iHSD Mill Efficacy on the Seeds of Australian Cropping System Weeds

Factors Affecting Weed Seed Devitalization with the Harrington Seed Destructor

Development and Evaluation of Low-Damage Maize Snapping Mechanism Based on Deformation Energy Conversion

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