A rapid dielectric method for determining the oil content of safflower and sunflower seed

1956 ◽  
Vol 33 (7) ◽  
pp. 314-316 ◽  
Author(s):  
Robert M. Johnson ◽  
W. Haward Hunt ◽  
M. H. Neustadt ◽  
Lawrence Zeleny
Keyword(s):  
Sunflower Seed ◽  
Oil Content ◽  
Dielectric Method

Water status and yield of sunflowers (Helianthus annuus) subjected to water stress during four stages of development

1977 ◽  
Vol 89 (3) ◽  
pp. 663-666 ◽  
Author(s):  
N. Sionit
Keyword(s):  
Water Stress ◽  
Seed Yield ◽  
Sunflower Seed ◽  
Oil Content ◽  
Water Status ◽  
Dry Weight ◽  
Stages Of Development ◽  
Stages Of Growth ◽  
Head Formation ◽  
Total Dry Weight

SummaryThe effects on seed yield of two levels of water stress at four stages of development were investigated in two varieties of sunflower, Krasnodarets and Record. The plants were grown from seed in large pots in an air-conditioned glasshouse at 26/20 °C and 70% relative humidity, with natural summer illumination. They were subjected to water stress before head formation, during head formation, during flowering, and during seed development.The leaf water potential of plants subjected to a water stress of – 16 bars returned to normal after rewatering, but plants subjected to – 23 bars did not return to their prestress level and some leaves died. A water stress of – 16 bars caused no significant reduction in dry weight of the vegetative structures, but stress at all stages of growth reduced seed yield. A water stress of – 23 bars reduced both total dry weight and seed yield at all stages of growth, seed yield being reduced more by a stress of – 23 bars than of – 16 bars. Oil content was slightly reduced by water stress.Water stress during anthesis reduced sunflower seed yield more than during later stages of development.

Comparative study of methods of determining oil content of sunflower seed

1981 ◽  
Vol 58 (11) ◽  
pp. 993-996 ◽  
Author(s):  
J. A. Robertson ◽  
W. R. Windham
Keyword(s):  
Comparative Study ◽  
Sunflower Seed ◽  
Oil Content

CANADIAN SUNFLOWER SEED.: I. BUSHEL WEIGHT AS A FACTOR IN GRADING

1945 ◽  
Vol 23f (2) ◽  
pp. 91-103
Author(s):  
H. R. Sallans ◽  
M. Berenbom ◽  
R. K. Larmour
Keyword(s):  
Refractive Index ◽  
Full Advantage ◽  
Iodine Value ◽  
Sunflower Seed ◽  
Oil Content ◽  
Correlation Coefficients ◽  
Acid Value ◽  
Oil Yield ◽  
Level Of Significance ◽  
Total Oil

To determine the importance of bushel weight as a factor in grading, 51 samples of Sunrise and 34 samples of Mennonite seed were examined for associations between bushel weight and other properties of commercial sunflower seed.Highly significant correlations of bushel weight with total oil content of the seed, r =.867**; percentage kernel, r =.740**; percentage oil in the kernel, r =.795**; and percentage nitrogen in the kernels, r = −.467** were obtained. Oil yield, estimated on the basis of a cake containing 5% oil and 10% moisture, was also associated with bushel weight, r =.871**. The correlation coefficients of bushel weight with iodine value, acid value, and refractive index were not significant.The present grade specifications fail to take full advantage of bushel weight as a factor in grading sunflower seed since the levels were set too low to be effective. It is suggested that the levels might well be 30 lb. for No. 1, 26 lb. for No. 2, and 22 lb. for No. 3 instead of 24 lb. for No. 1 and 21 lb. for No. 2 and No. 3. The effects of this change are discussed in relation to grading of the two varieties and the establishment of appropriate price spreads between grades.** Indicates that the 1% level of significance was attained.

A rapid dielectric method for determining the oil content of flaxseed

1953 ◽  
Vol 30 (11) ◽  
pp. 463-465 ◽  
Author(s):  
W. Haward Hunt ◽  
M. H. Neustadt ◽  
Joe R. Hart ◽  
Lawrence Zeleny
Keyword(s):  
Oil Content ◽  
Dielectric Method

ECONOMIC INJURY LEVELS FOR THE RED SUNFLOWER SEED WEEVIL (COLEOPTERA: CURCULIONIDAE) INFESTING OILSEED SUNFLOWER

1995 ◽  
Vol 127 (4) ◽  
pp. 561-568 ◽  
Author(s):  
Chengwang Peng ◽  
Gary J. Brewer
Keyword(s):  
Sunflower Seed ◽  
Oil Content ◽  
Economic Status ◽  
Field Studies ◽  
Economic Injury Level ◽  
Economic Injury ◽  
Smicronyx Fulvus ◽  
The Cost ◽  
Single Larva ◽  
Adult Weevil

AbstractThe control of the red sunflower seed weevil, Smicronyx fulvus LeConte, relies on the use of insecticides. An economic injury level is essential to the judicious deployment of insecticidal control. Field studies were conducted in 1992 and 1993 to quantify the weight loss and oil content loss of damaged kernels as a result of larval infestation and the relationship between the adult weevil population and the subsequent number of damaged achenes. We found that for each weevil sampled in plant stages R5.0–5.3, 26.88 damaged achenes resulted. Damaged kernels lost an average of 9.86 ± 2.36 mg (mean ± SD) per kernel, approximately equal to the amount consumed by a single larva. The oil content loss in damaged kernels was 3.34%. Economic injury levels were calculated as a function of the cost of controls, the market value, and the plant population density. Use of adult weevil counts when most plants in the fields are in plant stages R5.0–5.3 are recommended for calculating economic status.

scholarly journals Sunflower Seed Cake and Larvae MassRheological Properties Analysis During Pressing WithVarying Temperature, Pressure and Oil Content

2022 ◽  
Author(s):  
Ivan Shorstkii ◽  
Alexandr Gukasyan ◽  
Evgeny Koshevoi ◽  
Vyacheslav Kosachev
Keyword(s):  
Hydraulic System ◽  
Sunflower Seed ◽  
Oil Content ◽  
Fluid Model ◽  
Successful Implementation ◽  
Mathematical Apparatus ◽  
Bingham Model ◽  
Rotational Viscometer ◽  
Seed Cake ◽  
Alternative Protein

For the successful implementation of alternative protein sourcesforbiorefinery, optimization of the process parameters is crucial. Knowledge of the rheological propertiesis necessary for the design and development of appropriate equipment and process calculations.The objective of this research was to evaluate the effect of the following pre-treatments: temperature, pressure andeffect of initial oil content on the rheological properties of sunflower seedcake and larvae tissue. The rheological behavior of two protein sourceswas determined by using a rotational viscometer with a hydraulic system and thermostatic bath attached to the equipment. Using the mathematical apparatus and experimental data it was observed that the plastic viscosity of the sunflower seed cake corresponded to the viscosity of the vegetable oil, which confirmed the Bingham rheology assumption put forward in this work. For the larvae mass, a Hershey Buckley fluid model was proposed.A positive linear relationship was found for pressure and a negativelinear relationship was found for the oil content of the sunflower seed cake and larvae tissue on shear stress. Keywords: rheological property, sunflower seed cake, larvae, pulsed electricaldischarge, viscoplasticity flow, Bingham model, modelling

Analysis of oil content of sunflower seed by wide-line NMR

1979 ◽  
Vol 56 (12) ◽  
pp. 961-964 ◽  
Author(s):  
J. A. Robertson ◽  
W. H. Morrison
Keyword(s):  
Sunflower Seed ◽  
Oil Content ◽  
Wide Line

A RAPID METHOD FOR ESTIMATING THE OIL CONTENT OF SUNFLOWER SEEDS

1958 ◽  
Vol 38 (4) ◽  
pp. 419-423 ◽  
Author(s):  
A. L. Shewfelt ◽  
E. D. Putt
Keyword(s):  
Plant Breeding ◽  
Rapid Method ◽  
Filter Paper ◽  
Sunflower Seed ◽  
Oil Content ◽  
Hydraulic Press ◽  
Small Samples ◽  
Sunflower Seeds ◽  
Number Of Seeds ◽  
Breeding Selections

A rapid method was developed for estimating the oil content of sunflower seeds. The method consisted of placing a given number of seeds between layers of filter paper, pressing them by means of a laboratory hydraulic press, and measuring the weight of oil absorbed by the filter paper. The effects of pressure-load, time of pressing, types of absorbing paper, size of sample, and dehulling of the seed were studied and a recommended procedure adopted. The oil values obtained by the rapid method were approximately 73 per cent as high as those obtained by the standard Soxhlet procedure. Analyses of 117 sunflower seed samples by the two methods gave a correlation coefficient of + 0.852. The method is particularly suited to assessing of plant breeding selections for oil content because of its speed and its adaptability to small samples.

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