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Hard Red Spring Wheat Straw Yields in Relation to Grain Yields¹

ABSTRACT

Residue management planning programmers utilize a constant straw/grain ratio to predict wheat (Triticum aestivum L.) straw yields. The efficacy of this approach was evaluated for conventional height and semidwarf hard red spring wheat cultivars. Functional relationships between grain yields and straw/grain ratios were determined from data obtained in the northern Great Plains. Straw/grain ratios ranged from 0.72 to 4.71. Single correlation coefficients, r, were –0.643** and –0.589** for semidwarf and conventional (n = 117 and 72) over a grain yield range of 240 to 5,850 kg/ha. "Best fit" regression (n = 189) was Y = 3.152 – 0.000753X + 0.0000000655X² (Y = straw/grain ratio). About 78% of 49 observations fell within the 0.05 confidence limits at >3,000 kg/ha grain yield, but <30% at lower yields. Straw yields predicted by regression were within ±1,000 kg/ha in 74, 51, and 84% of the observations at grain yields of <1,600, 1,600 to 3,000, and >3,000 kg/ha, respectively. A single, constant straw/grain ratio will predict straw yields with less accuracy than ratios obtained from regression.

¹ Contribution from Soil, Water, and Air Sciences, North Central Region, SEA-USDA in cooperation with the Dept. of Soils, N. Dak. Agric. Expt. Stn.

² Armand Bauer is Soil Scientist at Northern Great Plains Research Center, SEA-USDA, Mandan, N. Dak., formerly Professor of Soils, N. Dak. State Univ.; Joseph C. Zubriski is Professor of Soils, N. Dak. State Univ., Fargo, N. Dak.

Received for publication February 6, 1978. Accepted for publication April 3, 1978.