PT  - JOURNAL ARTICLE
AU  - Bilbro, J. D.
TI  - Sunflower dry matter production and plant structural relationships for wind erosion modeling
DP  - 1992 Mar 01
TA  - Journal of Soil and Water Conservation
PG  - 194--197
VI  - 47
IP  - 2
4099  - http://www.jswconline.org/content/47/2/194.short
4100  - http://www.jswconline.org/content/47/2/194.full
AB  - A wind erosion prediction system (WEPS) is being developed by the Agricultural Research Service, U.S. Department of Agriculture. WEPS will be composed of seven submodels with appropriate data bases. The Crops submodel will calculate daily the total above-ground dry matter. Mathematical equations for the relationships of total dry matter to leaf area, stem area, and plant height will then be used to calculate an erosion-reduction factor for use in the Erosion submodel of WEPS. Such mathematical equations were developed for sunflower (Helianthus annuus L.) from data obtained in a 2-year growth and development study made under semiarid conditions. Growing conditions in 1987 and 1988 differed considerably. Therefore, regression coefficients of equations relating total dry matter to plant development also differed significantly between years. Consequently, the data for both years were combined and additional equations developed.