Desiccation of Sunflower With Diquat

Gubbels, G. H.; Dedio, W.

doi:10.4141/cjps85-110

Cited by 12 publications

(9 citation statements)

References 5 publications

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“…Although Robertson et al (1978) stated physiological maturity of sunflower was at about 360 g kg −1 achene moisture their results suggest that maximum achene weight occurred between 480 and 360 g kg −1 achene moisture. Gubbels and Dedio (1985, 1994) concluded sunflower yield reductions would not occur when desiccated at achene‐moisture levels <450 g kg −1 However, they also indicated several instances where yield reductions did not occur when desiccated at achene moistures as great as 530 g kg −1 Although the intent of our study was not to evaluate desiccation effects on seed yield at off label achene moisture levels the results of our study and previous researchers raises the question on when physiological maturity occurs in sunflower.…”

Section: Resultsmentioning

confidence: 52%

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Comparison of Stay‐Green and Conventional Sunflower Desiccation in the Northern Great Plains

Larson

Henson

2008

Agronomy Journal

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F ull-season crops grown in regions with short growing seasons such as the northern Great Plains oft en are subject to prolonged achene (seed plus hull) dry down due to shorter days, decreasing temperatures, and damp conditions associated with late fall. Management decisions for earlier harvest may prompt producers to apply chemical desiccants to hasten plant drydown. Earlier harvest lessens the potential for seed yield and quality reductions from diseased plants and black bird (Agelatus phoeniceus L.) damage, and secures grain in storage before inclement fall weather. Earlier harvest also oft en means market premiums especially if achene demand is high.Early sunfl ower desiccation studies conducted in Russia by Degtyarenko (1976) were prompted by prevailing poor weather conditions during harvest that limited achene moisture loss resulting in high achene moisture, storage problems, seed deterioration, loss of edible markets, and costly drying expenses. Degtyarenko (1976) compared two rates of the desiccant Mg chlorate on sunfl ower. Desiccated achene moisture 5 d aft er application was 43 and 46 g kg -1 less for 20 and 30 kg ha -1 rates, respectively, of Mg chlorate compared with the control. Further research by Degtyarenko (1976) indicated diquat was more eff ective than Mg chlorate in promoting receptacle and stalk drydown; however, both desiccants exhibited a similar achene drydown response.Palmer (1977) evaluated diquat desiccation eff ectiveness on sunfl ower grown in Manitoba, Canada, and reported optimum desiccation timing when achene moisture was between 200 and 250 g kg -1 . Harvest was advanced 11 to 14 d for the desiccated treatment compared with the nondesiccated control. Desiccation did not adversely aff ect achene yield, oil content, test weight, or germination. Palmer (1977) also noted desiccation would lengthen the period between sunfl ower harvest and freeze-up, which enabled more timely fall tillage rather than waiting until the following spring. Th is would be extremely important in regions with short growing seasons such as Canada and northern midwestern states of the United States.In Canada, Gubbels and Dedio (1985) reported sunfl ower harvest advancement with diquat ranging from 0 to 26 d with desiccant eff ectiveness dependent on weather conditions aft er desiccation. Cool and damp weather aft er desiccation reduced the eff ectiveness of diquat. Diquat applications at achene moisture levels >450 g kg -1 resulted in reduced achene yield, oil content, seed weight, and meal protein content. Utilization of desiccants in non-oilseed sunfl ower were also studied by Gubbels and Dedio (1994) and indicated earlier harvest of 14, 12, and 3 d for ABSTRACT Desiccant eff ectiveness in hastening sunfl ower (Helianthus annuus L.) harvest is based on research conducted for conventional sunfl ower hybrids; however, information is lacking regarding plant drydown response of more recently developed stay-green hybrids to desiccation. Stay-green and conventional sunfl ower hybrids were evaluated for plant drydo...

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Section: Resultsmentioning

confidence: 52%

“…In Canada, Gubbels and Dedio (1985) reported sunflower harvest advancement with diquat ranging from 0 to 26 d with desiccant effectiveness dependent on weather conditions after desiccation. Cool and damp weather after desiccation reduced the effectiveness of diquat.…”

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confidence: 99%

Comparison of Stay‐Green and Conventional Sunflower Desiccation in the Northern Great Plains

Larson

Henson

2008

Agronomy Journal

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“…Howevero oil content was not affected to the same degree, possibly because oil deposition is favored by lower temperatures This relatively small effect of freezing on oil content was contrary to that reported for canola, in which visibly frostdamaged seeds averaged 350 g kg-' oil compared with 455 g kg-r for undamaged seed (Daun et al 1985). Similarly, early application of the desiccant diquat to sunflower at the 59% achene-moisture stage reduced oil content by about 100 g kg-l relative to nondesiccated plants (Gubbels and Dedio 1985). It is possible that in the present study the flax plants were closer to full maturity and deposition of oil was nearer completion.…”

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confidence: 54%

Effect of frost injury on quality of flax seed

Gubbels¹,

Bonner²,

Kenaschuk³

1994

Can. J. Plant Sci.

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lgg4. Effect of frost injury on qlality^of^flax seed. Can. J' Plant Sci' 74:331-333.In field unOinUoruto.V studies, flax (Linum usitatissimum L.) was-frozen when 40-60% of the capsules were still green. Seed visibly frozen at this stage were of lower weight and density., darker in color, and lower in germinability than th9 fraction of the sample that was not visibly frozen. Also, 6il color was darker, oil and protein concentrations and stearic and oleic acid levels were lower, and palmitii, linoleic and linolenic acid levels and iodine values were higher in the frozen than the normal seed.

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“…Miklič (2001) found the highest protein content 7 DAF, at the seed moisture of 65.58%. Gubbels & Dedio (1985) recorded that protein content reached constant level at seed moisture of 45% and 64%. Radić (2006) determined stabilization of protein content in seed at the treatment 14 DAF.…”

Section: Resultsmentioning

confidence: 97%

Sunflower seed protein content in relation to desiccation date and seed moisture

Čanak¹,

Radić²,

Jocković³

et al. 2012

Ratar i povrt

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Summary: The objective of this study was to investigate the effect of desiccation date and seed moisture content on sunflower seed protein content. The experimental materials were three new parental sunflower lines of the Institute of Field and Vegetable Crops from Novi Sad, Serbia (L1, L2 and L3). Reglone forte (2 l ha -1 ) was used for desiccation and it was applied at 7-day intervals from the end of flowering to harvest maturity. The protein content was determined by the classical method of Kjeldahl. The stabilization of the protein content was determined in treatment that was performed 21 days after flowering (DAF) at seed moisture of about 45%. Regression analysis determined the highest and statistically significant effect of seed moisture at the moment of desiccation on seed protein content in the line L1, while the effects in lines L2 and L3 were not significant.

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Desiccation of Sunflower With Diquat

Cited by 12 publications

References 5 publications

Comparison of Stay‐Green and Conventional Sunflower Desiccation in the Northern Great Plains

Comparison of Stay‐Green and Conventional Sunflower Desiccation in the Northern Great Plains

Effect of frost injury on quality of flax seed

Sunflower seed protein content in relation to desiccation date and seed moisture

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