Use of Growing Degree Days to Project Sample Dates for Cereal Crops

Klepper, Betty; Rickman, R. W.; Zuzel, J. F.; Waldman, Sue E.

doi:10.2134/agronj1988.00021962008000050034x

Cited by 17 publications

(7 citation statements)

References 2 publications

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“…Different planting and emergence times dictated differ ent sampling dates for the cereal and weed plants (Table 1). Destructive sampling times were chosen to approximately coin cide with the same developmental stage for each species using a GDD technique that depends on the fact that winter cereal leaf production rate is controlled by GDD, not calendar date (7,17,19,30). In both years, plots were terminated in April to prevent contamination of the field with weed seed.…”

Section: Methodsmentioning

confidence: 99%

Comparative Above-Ground Development Rates for Several Annual Grass Weeds and Cereal Grains

Ball¹,

Klepper²,

Rydrych³

1995

Weed sci.

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Above-ground seedling development was characterized for five annual grass weeds: downy brome, bulbous bluegrass, jointed goatgrass, Italian ryegrass, wild oat; and three cereals: winter wheat, winter barley, and winter triticale in field experiments over two years. The rate of leaf production on the main stem of each species was linearly related to cumulative growing degree days (GDD) since planting. Leaf production rates were faster for bulbous bluegrass, downy brome, Italian ryegrass, wild oat, and barley than for wheat, triticale, and jointed goatgrass. The main stem development stage when individual tillers appeared was similar in all species except under poor seedbed conditions in 1991, in which case lower-node tillers were delayed in the cereals and jointed goatgrass, but not in most of the weed species. Bulbous bluegrass, downy brome, and barley had the same percentage of plants produce the first four primary tillers on the main stem in both years; the other species showed more year-to-year variation. Seedling heights at full emergence were generally greater for large-seeded species. Small-seeded species compared to large-seeded species tended to have greater relative increases in plant height over time. Knowledge of comparative development rates between these weeds and cereals could provide information for development of growth models for each of the species and could also improve understanding of the competitive relationships between grass weeds and cereal grains.

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Section: Methodsmentioning

confidence: 99%

Comparative Above-Ground Development Rates for Several Annual Grass Weeds and Cereal Grains

Ball¹,

Klepper²,

Rydrych³

1995

Weed sci.

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“…GDD were calculated using a standard GDD model for C 3 grasses (Ball et al, 2004;Klepper et al, 1988)…”

Section: Phenologymentioning

confidence: 99%

Comparative plant responses of Puccinellia distans and Puccinellia nuttalliana to sodic versus normal soil types

Tarasoff

Mallory‐Smith

Ball

2007

Journal of Arid Environments

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“…Cumulative GDD were calculated using local, daily maximum, and minimum air temperature data. A simple model was used to calculate cumulative GDD values for each sampling date (following Klepper et al 1988): GDD ϭ (daily maximum temperature ϩ daily minimum temperature)/2 where temperatures were recorded (in C). If the resulting daily GDD value was negative, it was reset to zero (base temperature).…”

Section: Pendleton-pullman 1996mentioning

confidence: 99%

Predicting timing of downy brome (Bromus tectorum) seed production using growing degree days

Ball¹,

Frost

Gitelman

2004

Weed sci.

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Downy brome in dryland winter wheat presents a major constraint to the adoption of reduced tillage cropping systems in the Pacific Northwest of the United States. Effective suppression of downy brome during fallow periods depletes seed in the soil and reduces infestations in subsequent winter wheat crops. Delayed tillage operations or delayed herbicide applications in the spring increase the risk for production of viable downy brome seed during fallow periods. In a series of studies, downy brome panicles were sequentially sampled at Pendleton, OR, and Pullman, WA, in 1996 and 1997, and at nine locations around the winter wheat growing region of the western United States in 1999 and 2001. Cumulative growing degree days (GDD) were calculated using local, daily maximum, and minimum air temperature data. A simple GDD model based on the formula GDD = (daily maximum temperature [C] + daily minimum temperature [C])/2, with a base temperature of 0 C and a starting point of January 1, was used to calculate cumulative GDD values for panicle sampling dates. Number of seed germinating per collected panicle was recorded in greenhouse germination tests. Estimations of degree days required for production of viable downy brome seed were made using nonlinear regression of germination on GDD. The GDD value at which viable seed can be found on plants (i.e., when seed germination > 0) was of interest. Estimates of the GDD values at which viable seed could be found in the three studies ranged from 582 GDD at Bozeman, MT, to 1,287 GDD at Stillwater, OK, with a group of GDD values for Pendleton and Pullman around 1,000. Variation in seed-set GDD among locations may be attributed to differing climatic conditions that control vernalization at the various locations or to differences in vernalization requirements among downy brome biotypes (or both).

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Use of Growing Degree Days to Project Sample Dates for Cereal Crops

Cited by 17 publications

References 2 publications

Comparative Above-Ground Development Rates for Several Annual Grass Weeds and Cereal Grains

Comparative Above-Ground Development Rates for Several Annual Grass Weeds and Cereal Grains

Comparative plant responses of Puccinellia distans and Puccinellia nuttalliana to sodic versus normal soil types

Predicting timing of downy brome (Bromus tectorum) seed production using growing degree days

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