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Investigations into the effect of location planting density nitrogen fertilization variety and harvest date on yield and contents of sweet sorghum



Investigations into the effect of location planting density nitrogen fertilization variety and harvest date on yield and contents of sweet sorghum



Journal of Agronomy & Crop Science 166(1): 8-18



Looking for high yielding plant species as renewable resources, sweet sorghum (Sorghum bicolor [L.] Moench) seems to be an interesting crop. In field trials at three locations in the south-west of Germany in 1983 and 1984 should be investigated the effect of N-fertilization, planting density, variety and harvest date on yield, different morphological characteristics and contents of sweet sorghum. The results indicate that yields of 15-20 t DM/ha are only feasible when the given temperature sum is higher than 2000.degree. C (> 5.degree. C). The maximum yield of 22.7 t DM/ha resp. 6.5 t/ha "Free Fermentable Sugar" (FFZ) was realized when a sufficient water supply and N-fertilization had been guaranteed. The different possibilities of utilization of sweet sorghum e.g. as sugar crop, agricultural raw material for combustion or as forage crop urge the plant breeder to intensify the breeding efforts adapting this crop at the climatic conditions of Germany.

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