Bohrson, L.

Olfert, K.

English

University of Saskatchewan Research Archive

The CHU number of a variety is the number of CHUs required to achieve 32% Kernel MoistureStages of MaturityGerminationFirst leafSecond leaftoApprox. 15 leaf TasselSilkMilkDoughDentBlack LayerKernel DrydownGenerally you hope to achieve silk by August 1 in SaskatchewanSaskatchewan Accumulated Corn Heat Units90% Confidence for Grain Production Average Accumulated CHUs for Silage ProductionMicroclimates of higher CHUs can be achieved by a south facing slope, warm sandy soils, shelterbelts, longer day lengths, and uniform air/water drainage. If you do not receive enough CHUs, kernel formation will be incomplete and you will not achieve high Energy levels. A TDN of 86% for grain is an achievable target. Five Hundred kernels can be harvested for every kernel seeded from a variety that suits your local environment. Grain yield has increased over 50% in the last 25 years on the Canadian Prairies. When combining corn, the plant must have achieved sufficient maturity (black layer) and moisture. Safe storage for grain corn is 14% M.C. Artificial drying will be required. Great cob development delivers corn silage of over 70% TDN. Spring delays and/or an early fall costing up to 200 seasonal CHUs less than planned, will still allow the opportunity for good silage quality. The Mapping and Application of Corn Heat Units for SaskatchewanIntroductionIn 1964, Lloyd G. Sonmor (Agriculture Agri-Food Canada, Saskatoon) began the study and application of Corn Heat Units in Saskatchewan. Mr. Sonmor tested Ontario’s corn agrometeorology research of Brown et al. In 1976, the first prairie CHU mapping was completed br Dr. David J. Major (AAFC, Lethbridge). The leadership of Dr. Robert I. Hamilton (AAFC, Brandon), in the 1970’s and early 1980’s, focused the science that advanced today’s corn industry on the prairies. This poster uses the latest CHU equation in describing the largest number of temperature reporting sites in the most recent twenty five year data set. Warm season crops are numerous and mapping CHUs can also help in describing the production risk of other crops, i.e. soybeans, that can have greater adaptation through breeding and global warming. The probability of receiving 2100 CHUs on the prairies (Major, et al, 1976).ReferencesM. Champlin and J.B. Harrington. 1921. Report of the Southwest Saskatchewan Corn Research Project, University of Saskatchewan, Ag. Research Bulletin No. 5.E.L. Kirk and J.B. Harrington. 1920. Corn Growing in Saskatchewan, University of Saskatchewan, Field Husbandry Circular No. 30.B.L. Ma, D.W. Stewart, and L.M. Dwyer. 2004. Corn Growth and Development. S. Bittman and C.G. Kowalenko Advanced Silage Corn Management. 115-117.D.J. Major, D.M. Brown, A. Bootsma, G.DuPuis, N.A. Fairey, E.A. Grant, D.G. Green, R.I. Hamilton, J. Langille, L.G. Sonmor, G.C. Smeltzer, and R.P. White. 1983. An evaluation of the corn heat unit system for the short-season growing regions across Canada. Can. J. Plant Sci. 63:121-130. D.J. Major, W.L. Pelton, C.F. Shaykewich, S.H. Gage, and D.G. Green. 1976. Heat units for corn in the Prairies. Agric. Canada Canadex 111.070.D.A. McWilliams, D.R. Berglund, and G.J. Endres. 1999. Corn Growth and Management. NDSU Extension Service A-1173.L.G. Sonmor. 1982. Is Grain Corn Practical in Saskatchewan. Saskatchewan Corn Committee, Saskatoon Research Station Letter, No. 33.The seasonal CHU was calculated by a sum of all the daily CHUs from oMay 15 until the first -3 C frost. Data from 1980-2005 was used. The 9/10 is the third lowest seasonal CHU. 1 2L. Bohrson  and K. Olfert1 Senior Irrigation Agrologist, Irrigation Crop Diversification Corporation, Swift Current, Saskatchewan, Canada, bohrsonl@agr.gc.ca, (306) 778-50432 Irrigation Agrologist, Irrigation Crop Diversification Corporation, Swift Current, Saskatchewan, Canada, olfertk@agr.gc.ca, (306) 778-5041Irrigation Crop Diversification Corporation

The mapping and application of corn heat units for Saskatchewan

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https://harvest.usask.ca/bitstream/10388/9453/1/L.%20Bohrson%20and%20K.%20Olfert%2c%202006.pdf

The mapping and application of corn heat units for Saskatchewan

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