Relationships among growing degree-days, tenderness, other harvest attributes and market value of processing pea (Pisum sativum L.) cultivars grown in Quebec

2006 ◽  
Vol 86 (2) ◽  
pp. 525-537 ◽  
Author(s):  
Edith Fallon, Nicolas Tremblay ◽  
Yves Desjardins
Keyword(s):  
Moisture Content ◽  
Size Distribution ◽  
Seed Size ◽  
Growing Degree Days ◽  
Harvest Time ◽  
Degree Days ◽  
Fresh Matter ◽  
Yield And Quality ◽  
Grain Moisture ◽  
The Relationship

In Quebec, grower income from processing peas is a function of yield and tenderometer reading. If peas are harvested early, the yield is poor, but the overall quality is superior, as indicated by lower tenderometer readings. Later harvests result in g reater yields but reduced quality (higher tenderometer readings). A better understanding of the relationship between harvest time, yield and quality is needed. In this study, the relationships between yield, tenderometer readings, size distribution and grain moisture content were examined as a function of growing degree-days (GDD) and production year for pea cultivars of different seed size categories. Yield and harvest attributes (tenderometer readings, seed size distribution and moisture content) were highly season dependent and their rates of change over the course of the harvest period also varied with the cultivar and year. Quality declined rapidly once the crop reached optimal maturity, while yield increased in a less predictable manner. Consequently, it was difficult to identify a harvest time that would consistently maximize grower returns. The highest income was generally not obtained at the optimal tenderometer readings presently used by the industry. Key words: Maturity, harvest date, climate, fresh matter yield, tenderometer, pea size

scholarly journals The Relationship Between the Moisture Content of Sweetcorn Raw Material and the Quality of the Deep-Frozen End Product

2003 ◽  
pp. 135-139
Author(s):  
Éva Kállai
Keyword(s):  
Moisture Content ◽  
Sweet Corn ◽  
Eating Habits ◽  
Great Part ◽  
Raw Material ◽  
Harvest Time ◽  
Foreign Matter ◽  
Physical Quality ◽  
The Relationship

One of the remarkable effects of the economical and social development is the changing of the eating habits, first of all increasing consumption of deep-frozen products. The spreading of the sweet corn under these vegetables is characteristic.The parameters exerting influence on the quality of the deepfrozen sweetcorn is classed in 3 categories:• Physical quality: foreign matter, clumps, blemished corn, broken kernel, miscut, pulled kernel.• Organoleptical features: taste, colour, texture, and sweetness.• Microbiological features: TVC, mould, yeast.The moisture content of the raw material influences the organoleptical features to the highest degree.We take continuously samples from the raw material arriving in to the factory to determinate moisture content, and from the product to specify the organoleptical features.Based on the data of 2002 we can make the following findings:The colour of the deepfrozen sweetcorn is less influenced by the moisture content. The taste is between 69% and 72% the most optimal, but over 72% get worse, more „milky”, water-tasted because of the underdevelopment of sweetcorn. The texture continuously becomes better with the increasing of moisture content. Under 67% of water the class „C” is typical, which means a taste with weak charasteric, a bit scathing or bitter, and texture with rubbery inner part and hard pericarpia. The decadence of taste is caused by converting a great part of sugar into starch.The correlation between moisture and quality is varying by varieties; different varieties have their best quality by different moisture content. By our investigations the best harvest time is at the 69-72% moisture content. At this point are the organoleptical features the most optimal, and the grower has not the loss of yield caused by early harvesting.

Estimating Corn Growth, Yield, and Grain Moisture from Air Growing Degree Days and Residue Cover 1

1987 ◽  
Vol 79 (1) ◽  
pp. 53-60 ◽  
Author(s):  
J. B. Swan ◽  
E. C. Schneider ◽  
J. F. Moncrief ◽  
W. H. Paulson ◽  
A. E. Peterson
Keyword(s):  
Growth Yield ◽  
Growing Degree Days ◽  
Degree Days ◽  
Grain Moisture

Leaf appearance rate of summer rape

1991 ◽  
Vol 71 (2) ◽  
pp. 405-412 ◽  
Author(s):  
M. J. Morrison ◽  
P. B. E. McVetty
Keyword(s):  
Leaf Number ◽  
Growing Degree Days ◽  
Linear Regression Equation ◽  
Degree Days ◽  
Mean Temperature ◽  
Appearance Rate ◽  
Leaf Appearance Rate ◽  
Number Of Leaves ◽  
Leaf Appearance ◽  
The Relationship

Leaf appearance rate (LAR) is defined as the slope of the regression of leaf number on time of appearance. LARs were calculated for summer rape using both calendar days (CD) and growing degree days (GDD) as measurements of time. The relationship between the number of leaves and GDD or CD was linear. LARs after emergence were 0.022 leaves GDD−1 or 0.247 leaves d−1. Summer rape was grown in growth cabinets set at different mean temperatures to study the effect of air temperature on LAR. The relationship between leaf number and time was linear. When CD were used as a measure of time, LAR increased as mean temperature increased, while the reverse was true when GDD were used to measure time. Cabinet and field LARs were compared at a field mean temperature of 16.5 °C. Cabinet LARs were 0.021 leaves GDD−1 or 0.22 leaves CD−1 which were similar to those calculated in the field. The linear regression equation describing the relationship between LAR (leaves GDD−1) and mean cabinet temperature was used with field-measured daily mean temperatures and GDD to predict the number of leaves for field conditions. When observed number of leaves were plotted against predicted number of leaves, the resulting slope was not significantly different from one, indicating that the model developed in the growth cabinet can be used to predict LAR in the field. Key words: Leaf appearance rate, Brassica napus, phyllochron

scholarly journals Comparison of seasonal thermal indices for measurement of corn maturity in a prairie environment

1992 ◽  
Vol 72 (4) ◽  
pp. 1157-1162 ◽  
Author(s):  
S. Plett
Keyword(s):  
Correlation Coefficients ◽  
Growing Degree Days ◽  
Degree Days ◽  
Thermal Indices ◽  
Corn Hybrids ◽  
Thermal Index ◽  
Heat Units ◽  
Coefficients Of Variation ◽  
Grain Moisture ◽  
Specific Stage

This study was initiated to determine (i) which thermal index — corn heat units (CHU), modified CHUs (mCHU) or growing degree–days (GDD) — was most consistent across years and locations and (ii) which maturity index — 50% silk, time to 30% grain moisture or time to 100% milk line — was the most consistent measure. Fifteen corn hybrids were evaluated at Morden and Brandon, Manitoba, over 3 yr (1988–1990). Correlation coefficients between total accumulation of thermal units from planting to first frost and thermal units required to reach a specific stage of maturity ranged from 0.283 to 0.969. The lowest correlations were between CHU and time to 50% silk. Coefficients of variation (CVs) were always lower for CHU than for either mCHU or GDD. CV was highest for time to 100% milk line but similar between time to 50% silk and time to 30% grain moisture. Correlations between ranking of hybrids across site–years was highest for mCHU. Overall ranking of thermal indices for consistency was CHU > GDD > mCHU. Time to 50% silk was the most consistent of the measures of maturity. Time to 30% grain moisture was a more consistent measure of maturity than time to 100% milk line.Key words: Maize, heat units, growing degree–days, milk line, grain moisture

scholarly journals Analysis of multi peril crop insurance loss ratiosAnalysis of multi peril crop insurance loss ratios

2010 ◽  
Vol 51 ◽  
Author(s):  
Lina Žalgirytė ◽  
Gediminas Račkauskas
Keyword(s):  
Pareto Distribution ◽  
Crop Insurance ◽  
Weather Conditions ◽  
Growing Degree Days ◽  
Monthly Precipitation ◽  
Degree Days ◽  
The Relationship

In the first part of this paper, the distribution of loss ratios for five crops was analyzed. The results show that the truncated shifted Pareto distribution can be used for crop insurance loss ratios approximation. In the second part, the relationship between weather conditions and crop insurance loss ratios was tested. Results suggest that this dependency is weak. It shows that crop insurance loss ratios are affected not only by weather conditions – monthly growing degree days and monthly precipitation – but also by other factors.

scholarly journals Relationship between agro-ecological resources of vineyards and the anthocyanins complex in berries

2021 ◽  
Vol 247 ◽  
pp. 01013
Author(s):  
Elena Ostroukhova ◽  
Evgeniy Rybalko ◽  
Svetlana Levchenko ◽  
Vladimir Boyko ◽  
Dmitriy Belash ◽  
...  
Keyword(s):  
Inverse Correlation ◽  
Cabernet Sauvignon ◽  
Growing Degree Days ◽  
Red Wines ◽  
Degree Days ◽  
Natural Region ◽  
Ecological Resources ◽  
Heat And Moisture ◽  
The Relationship ◽  
Western Foothill

This article is aimed at identifying the relationship between the territories agro-ecological conditions and the anthocyanins complex formation of grapes, which determines the quality and biological value of red wines. Using HPLC, the anthocyanins complex of 'Cabernet Sauvignon' cultivar from 6 industrial vineyards, located in three natural regions of Crimea, was studied. The agro-climatic resources of vineyards were assessed using the methods of geoinformation and mathematical modeling. It was detected that according to parameters of heat and moisture supply vineyards discriminated with Wilks L. = 0.007; α<0.00001. The direct correlation (r = 0.88-0.95) was identified between growing degree days above 10 °C, growing degree days above 20 °C, Winkler index, average growing season temperature and the rate of monoglucosides of malvidin and its derivatives in anthocyanins complex of berries; the inverse correlation – between the same agroecological indexes and the rate of cyanidin, petunidin and their derivatives. The similarity (Ed = 2.79-2.98) of anthocyanins complex of grapes from Villino v., Uglovoe v. and Yalta t. located in the western foothill-coastal and south coast regions was discovered. The highest content of anthocyanins was found in grapes from Privetnoe v. (5487 ± 384 mg kg-1), the smallest - from Solnechnaya Dolina v. (2154 ± 129 mg kg-1) located in the same natural region. The results obtained indicate the need for a "point" assessment of the agro-ecological resources for creation of industrial vineyards.

Relationships Among Green Foxtail (Setaria viridis) Seedling Development, Growing Degree Days, and Time of Nicosulfuron Application

1996 ◽  
Vol 10 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Frank Forcella ◽  
Kevin R. Banken
Keyword(s):  
Seedling Growth ◽  
Weed Management ◽  
Corn Yield ◽  
Growing Degree Days ◽  
Yield Losses ◽  
Degree Days ◽  
Predictive Tool ◽  
Application Timing ◽  
Green Foxtail ◽  
The Relationship

Success of postemergence weed management often depends upon application timing and weed seedling size. To develop a predictive tool for estimating green foxtail development and optimizing timing of management operations, seedling growth was monitored in fields for two years, as well as in a single greenhouse experiment, and compared with elapsed thermal time (growing degree days, GDD, base 10 C). The relationship between seedling height (mm) and GDD was similar both years and could be described by the following equation: Height = (-0.27 + 0.033 * GDD)2. A comparable equation described seedling growth in a greenhouse. Leaf number was linearly related to GDD. Green foxtail in corn was controlled with nicosulfuron applied at seven intervals between 100 and 450 GDD after corn planting in 1993 and 1994. In 1993 corn yield losses due to green foxtail interference were least when nicosulfuron was applied 200 to 300 GDD after planting, at which time green foxtail height was 50 to 100 mm. In 1994 corn yield losses were minimized if nicosulfuron was applied any time before 300 GDD.

Comparison of grain moisture vs. visual observation in selection for early maturity in barley

2000 ◽  
Vol 80 (2) ◽  
pp. 327-329
Author(s):  
S. M. Dofing
Keyword(s):  
Correlation Coefficients ◽  
Visual Observation ◽  
Growing Degree Days ◽  
Degree Days ◽  
Hordeum Vulgare L ◽  
Early Maturity ◽  
Barley Cultivars ◽  
Harvest Dates ◽  
Grain Moisture ◽  
Days To Maturity

The purpose of this research was to compare assessments of maturity in barley (Hordeum vulgare L.) using growing degree days to maturity based on visual head color and percent grain moisture. Twelve barley cultivars were evaluated for 3 yr at Palmer, Alaska, using three harvest dates. Phenotypic and environmental correlation coefficients between growing degree days to maturity and grain moisture at harvest were high, and tended to be highest at earlier harvest dates. Key words: Barley, early maturity, selection

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