Seed Conditioning, Volume 3

Gregg, Bill; Billups, Gary

doi:10.1201/ebk1578086092

Cited by 11 publications

(2 citation statements)

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“…They include geometric parameters, aerodynamic properties, mass, density, electrostatic and mechanical properties. The use of various machines and devices in separation processes compromises the accuracy of seed classification [15,16].Conventional seed cleaning machines and devices (winnowers, grain graders, separators, aspirators) that rely on a single seed attribute generally do not produce satisfactory results, and the purified material fails to meet the relevant industrial standards. Therefore, seed sorting methods are being continuously improved by searching for new separation traits and designing new equipment [17].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Selected Factors on Separation Efficiency in a Pneumatic Conical Separator

et al. 2020

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Pneumatic separation is one of the available methods for cleaning seed mixtures. Variously shaped seeds, including spherical (vetch), elongated (wheat), and pyramid-shaped seeds (buckwheat), were analyzed in this study. A seed mixture containing 80% of main crop seeds and 20% of other crop seeds imitating impurities was separated in a pneumatic separator with the shape of an inverted cone in a stream of air. The regression equations describing the separation efficiency of the main crop seeds and other crop seeds imitating impurities (η) and the separation efficiency index (ε) were characterized by high and very high fit to empirical data. The coefficient of determination for the analyzed seed mixtures ranged from 0.71 to 0.99. The conical separator supported effective separation of seed mixture components in a stream of air.

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Section: Introductionmentioning

confidence: 99%

The Effect of Selected Factors on Separation Efficiency in a Pneumatic Conical Separator

et al. 2020

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“…Studies on rice florets have found that de-awning not only improves their 'flowability' through a horizontal hopper orifice but also reduces the cohesiveness between them and increases the bulk density by 66 to 72% ). However, de-awning techniques, such as using hammer mills and hand rubbing, are highly dependent on the operator (Gregg & Billups 2010) and have very low seed processing rates (Loch 1993) for large-scale land seeding efforts.…”

Section: Introductionmentioning

confidence: 99%

Flash flaming technology shows promise to improve seed-based rehabilitation outcomes

Ling¹,

Guzzomi²,

Merritt³

et al. 2019

Proceedings of the International Conference on Mine Closure

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The success of mine site rehabilitation using native seeds is hampered by poor seedling establishment. Seed enhancement treatments including seed coatings and pelleting form one strategy to improve establishment. However, for some seeds, particularly those of grasses, irregular shapes and surface features of covering floret structures are difficult to remove at commercial scales and these features hinder both the polymer seed coating process and the 'flowability' of material through mechanical sowing equipment. A flash flaming technique has recently been developed which effectively removes these surface features from Triodia (spinifex) florets. Tests show flaming imparts a significant volume reduction in seed collections, increases the bulk density, and improves the 'flowability' of treated florets, with little to no alteration to the viability of seeds. Current work is extending the application of flaming to additional genera with problematic features including those of Ptilotus, Cymbopogon, Eriachne, Stirlingia, Chloris, Rytidosperma, and Gomphrena. Different methods of flash flaming are being investigated to determine the optimum settings for each species to achieve a balance in 'flowability', seed survivability, and improvement in floret volume and bulk density. Future work is aimed at further improving the flash flaming method and testing the flow of treated seed material through commercial-scale seeding machinery.

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Managing herbicide‐resistant waterhemp (Amaranthus tuberculatus [Moq.] J.D. Sauer) seedbanks by integrating several management tactics

Schleich,

Licht,

Owen

et al. 2023

Agrosystems Geosci & Env

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Herbicide‐resistant waterhemp (Amaranthus tuberculatus [Moq.] J.D. Sauer) continues to threaten the productivity of many US crops. Thus, integrating non‐herbicidal tactics with herbicides to reduce weed seedbanks is gaining popularity. A field study was conducted near Logan, IA from fall 2021 to fall 2022 to evaluate the impacts of cereal rye (Secale cereale L.) cover crop, herbicides, and harvest weed seed destruction on the waterhemp seedbank inputs. The cereal rye cover crop reduced waterhemp seed production by 90% compared to treatments without the cereal rye cover crop, while herbicides did not significantly affect waterhemp seed production. Furthermore, 96% of waterhemp seeds that entered the combine at harvest were destroyed and seed destruction effectiveness was not affected by cereal rye cover crop, herbicide program, or combine speed. Thus, cover crops and weed seed destruction are effective tactics to minimize waterhemp seedbank inputs. Waterhemp seed retention and combine header losses of waterhemp seeds were evaluated at harvest. Waterhemp seed retention was not affected by the cereal rye cover crop or herbicide programs. Only 30% of waterhemp seeds remained on the plant at harvest; the likely causes of seed shattering were late harvest and windy conditions prior to harvest. Waterhemp seed shattering from the combine header averaged 2.6% and was not affected by cover crop, herbicide program, or combine speed. These results support the inclusion of non‐herbicidal control tactics to reduce herbicide‐resistant waterhemp seedbanks and suggest the need for future research to optimize weed seed destruction.

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Seed Conditioning, Volume 3

Cited by 11 publications

References 0 publications

The Effect of Selected Factors on Separation Efficiency in a Pneumatic Conical Separator

The Effect of Selected Factors on Separation Efficiency in a Pneumatic Conical Separator

Flash flaming technology shows promise to improve seed-based rehabilitation outcomes

Managing herbicide‐resistant waterhemp (Amaranthus tuberculatus [Moq.] J.D. Sauer) seedbanks by integrating several management tactics

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