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Kenaf Forage Yield and Quality under Varying Water Availability

USDA-ARS, Central Great Plains Res. Stn., 40335 County Road GG, Akron, CO 80720

View larger version (24K): [in a new window]   Fig. 1. Plot layout for gradient irrigation area used in water use/yield studies of kenaf at Akron, CO. Grad. = gradient irrigation application section.

View larger version (21K): [in a new window]   Fig. 2. Kenaf height vs. water use for two cuttings of kenaf grown under an irrigation gradient at Akron, CO, in 1997 and 1998. Bars are ± one standard deviation.

View larger version (29K): [in a new window]   Fig. 3. Dry matter yield vs. water use for two cuttings of kenaf grown under an irrigation gradient at Akron, CO, in 1997 and 1998. Bars are ± one standard deviation.

View larger version (43K): [in a new window]   Fig. 4. Influence of water use on concentration of crude protein, neutral detergent fiber, acid detergent fiber, digestible protein, total digestible nutrients, and relative feed value for two cuttings of kenaf grown under an irrigation gradient at Akron, CO, in 1997 and 1998. Bars are ± one standard deviation. • = 1997 first cutting, = 1998 first cutting, = 1997 second cutting, and = 1998 second cutting.

View larger version (49K): [in a new window]   Fig. 5. Concentration of crude protein, neutral detergent fiber, acid detergent fiber, digestible protein, total digestible nutrients, and relative feed value averaged over water gradient positions for two cuttings of kenaf grown under an irrigation gradient at Akron, CO, in 1997 and 1998. Bars are ± one standard deviation.

View larger version (21K): [in a new window]   Fig. 6. Comparison of crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), digestible protein (DP), and total digestible nutrients (TDN) between kenaf and corn grown at Akron, CO, in 1999. Bars are ± one standard deviation.

View larger version (26K): [in a new window]   Fig. 7. Estimated kenaf and corn dry matter yield and crude protein production under three water use conditions at Akron, CO.

View larger version (26K): [in a new window]   Fig. 8. Volumetric water content of rainfed plots in 1998 at planting and two harvest dates for kenaf on Weld silt loam at Akron, CO. Bars are ± one standard deviation.

View larger version (24K): [in a new window]   Fig. 9. Frequency distributions of kenaf dry matter yields estimated from production functions for combined first and second cuttings, soil water use of 138 mm, and historical precipitation records (1965–2001) from Akron, CO.