0679 Investigating the relationship between corn silage fiber digestibility and rainfall, growing degree days, and soil type

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 324-325
Author(s):  
S. A. Flis ◽  
T. P. Tylutki ◽  
P. Sirois
Keyword(s):  
Soil Type ◽  
Corn Silage ◽  
Growing Degree Days ◽  
Degree Days ◽  
Fiber Digestibility ◽  
The Relationship

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

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 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.

Evaluation of Finger Millet Varieties under Rainfed Condition of Eastern India

2017 ◽  
Vol 4 (03) ◽  
Author(s):  
M. K. Singh ◽  
VINOD KUMAR ◽  
SHAMBHU PRASAD
Keyword(s):  
Field Experiment ◽  
Finger Millet ◽  
Yield Potential ◽  
Growing Degree Days ◽  
Eastern India ◽  
Degree Days ◽  
Rainfed Condition ◽  
Net Returns ◽  
Humid Environment ◽  
Use Efficiency

A field experiment was carried out during the kharif of 2014 and 2015 to evaluate the yield potential, economics and thermal utilization in eleven finger millet varieties under the rainfed condition of the sub-humid environment of South Bihar of Eastern India. Results revealed that the significantly higher grain yield (20.41 q ha-1), net returns (Rs 25301) and B: C ratio (1.51) was with the finger millet variety ‘GPU 67’ but was being at par to ‘GPU28’and ‘RAU-8’, and significantly superior over remaining varieties. The highest heat units (1535.1oC day), helio-thermal units (7519.7oC day hours), phenothermal index (19.4 oC days day-1) were recorded with variety ‘GPU 67’ followed by ‘RAU 8’ and ‘GPU 28’ and lowest in ‘VL 149’ at 50 % anthesis stage. Similarly, the highest growing degree days (2100 oC day), helio-thermal units (11035.8 oC day hours) were noted with ‘GPU 67’ followed by ‘RAU 8’ and ‘GPU 28’ at maturity. The highest heat use efficiency (0.97 kg ha-1 oC day) and helio-thermal use efficiency (0.19 kg ha-1 oC day hour) were in ‘GPU 67’ followed by ‘VL 315’.

scholarly journals Determining the critical period for weed control in high-yielding cotton using common sunflower as a mimic weed

2019 ◽  
Vol 33 (6) ◽  
pp. 800-807 ◽  
Author(s):  
Graham W. Charles ◽  
Brian M. Sindel ◽  
Annette L. Cowie ◽  
Oliver G. G. Knox
Keyword(s):  
Weed Control ◽  
Critical Period ◽  
Yield Loss ◽  
Field Studies ◽  
Growing Degree Days ◽  
Degree Days ◽  
Weed Density ◽  
High Level ◽  
The Cost ◽  
Planting Season

AbstractField studies were conducted over six seasons to determine the critical period for weed control (CPWC) in high-yielding cotton, using common sunflower as a mimic weed. Common sunflower was planted with or after cotton emergence at densities of 1, 2, 5, 10, 20, and 50 plants m−2. Common sunflower was added and removed at approximately 0, 150, 300, 450, 600, 750, and 900 growing degree days (GDD) after planting. Season-long interference resulted in no harvestable cotton at densities of five or more common sunflower plants m−2. High levels of intraspecific and interspecific competition occurred at the highest weed densities, with increases in weed biomass and reductions in crop yield not proportional to the changes in weed density. Using a 5% yield-loss threshold, the CPWC extended from 43 to 615 GDD, and 20 to 1,512 GDD for one and 50 common sunflower plants m−2, respectively. These results highlight the high level of weed control required in high-yielding cotton to ensure crop losses do not exceed the cost of control.

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