INSTITUTO NACIONAL DE INVESTIGACIÓN Y TECNOLOGÍA AGRARIA Y ALIMENTARIA (INIA) DPTO. MEDIO AMBIENTE ALCALA DE HENARES, MADRID, SPAIN Madrid, September 2006.

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INSTITUTO NACIONAL DE INVESTIGACIÓN Y TECNOLOGÍA AGRARIA Y ALIMENTARIA (INIA) DPTO. MEDIO AMBIENTE ALCALA DE HENARES, MADRID, SPAIN Madrid, September 2006 BIOKENAFQLK5-CT Biomass Production Chain and Growth Simulation Model for Kenaf

Task 2.3: Effect of irrigation and nitrogen fertilization on biomass yields INIA Dpto. Medio Ambiente Alcalá de Henares (Madrid) Task 2.2: Effect of different sowing dates and plant population on biomass yields SIDT Junta de Extremadura Finca “La Orden”, Guadajira, Badajoz

Results of three years (Alcalá de Henares, Madrid, Spain). Kenaf dry yields of 15 t/ha in total biomass and 10 t/ha in stem biomass may be obtainable under normal conditions in central plateau of Spain, but in optimal conditions 21 t/ha in total biomass and 15 t/ha in stem biomass may be obtainable The maximum kenaf yield was obtained at the end of october ( DAS in normal conditions and 170 DAS in optimal conditions). The irrigation treatment significantly affected to kenaf biomass production. The biomass production of kenaf was reduced significantly in I-0, I-25, and I-50 treatments, when compared with I-100 treatment. DAS: days after sowing.

The reduction of water amount significantly decreased the production of plant kenaf biomass in our climatic conditions The kenaf production was highly employee of a great water consumption

The biomass production rate was different in diverse periods from the cycle of kenaf growth Thus, the use of regulated deficit irrigation strategies in specific growing periods of kenaf crop may be investigated in order to optimise the water inputs without to reduce the biomass production

- kenaf variety: Tainung 2 - sowing date: 30/05/ plant density: plants/ha Essays in 2006: Deficit Irrigation

In the A and B irrigation treatments the biomass production was similar, but with treatment B a saving of 36 % of used water was obtained

Kenaf dry yields of t/ha in stem biomass may be obtainable under normal conditions in Extremadura, Southwestern Spain. The maximum kenaf yield was obtained at the end of october ( DAS in normal conditions and 170 DAS in optimal conditions). Kenaf field trials. The harvest tests carried out with a forage chopper and a baling machine have been satisfactory, allowing by means of this method to make a correct harvest of the kenaf stems.