Igniscum - a new bioenergy crop 

Igniscum fieldPlant monitoring in the fieldIn situ determination of chlorophyllLysimeter experiment with IgniscumTranspiration and photosynthesis measurementsPhotosynthesis and nitrogen efficiencyGreenhouse experimentsIgniscum field trail


The cultivars Igniscum Candy and Igniscum Basic of the Sakhalin Knotweed (Fallopia sachalinensis, Fam. Polygonaceae) are new bioenergy crops, which are characterized by a high annual biomass production. Information on the crop production of this species is rare. Hence, understanding plant response to the combinations of water and nutrients availability is crucial for the development of sustainable plant production. Field experiments are arranged under different climatic and soil conditions across Germany from Schleswig-Holstein to southern Germany to investigate the plant growth on the field scale. Ecophysiological parameters are determined for the relations between growth stages, chlorophyll content, photosynthesis and plant nutrients status. In greenhouse experiments we investigate the interrelations between nutrient supply, biomass production, and plant ecophysiology. For the determination of yield-transpiration relations at whole plant level we used a wick lysimeter system, which allows us to study plant growth under controlled water regimes and to calculated the plant transpiration. The irrigation is supplied by an automatic drip irrigation system and computer-controlled in relation to the volumetric soil water content.


Effects of nitrogen and phosphate fertilization on leaf nutrient content, photosynthesis, and growth of the novel bioenergy crop Fallopia sachalinensis  cv. ‘Igniscum Candy‘

The aim of the study was to determine the effects of nitrogen and phosphate fertilization on the growth performance of the novel bioenergy crop Fallopia sachalinensis cv. ‘Igniscum Candy’ (Polygonaceae). In a controlled pot experiment various nitrogen (0, 50, 150, 300 kg N ha-1) and phosphate (20, 40, 80 kg P ha-1) fertilizer amounts were applied to measure the effect on the biomass, plant height, leaf area, and leaf nutrient (N and P) content. Furthermore, the ecophysiological processes of chlorophyll content, chlorophyll fluorescence, and gas exchange were measured. The application of nitrogen correlated positively with biomass production, while phosphate fertilization did not show a significant effect on plant growth or ecophysiological parameters. The leaf nitrogen contents were significantly correlated with the nitrogen applications, while the leaf phosphate contents did not show a correlation with the P fertilizations, but increased with the leaf nitrogen contents. A significant linear correlation between N-Tester chlorophyll meter values and chlorophyll contents as well as with leaf nitrogen contents could be determined. Under the influence of the nitrogen fertilization, net photosynthesis increased from 3.7 to 6.6 µmol m-2 s-1. The results of this experiment demonstrated that nitrogen fertilization has an overall positive correlation with leaf nitrogen content, photosynthesis, and growth of the bioenergy crop Fallopia sachalinensis var. Igniscum Candy.

Read the paper Journal of Applied Botany and Food Quality 88: 22-28.


Transpiration and biomass production of the bioenergy crop Giant Knotweed Igniscum under various supplies of water and nutrients

Soil water availability, nutrient supply and climatic conditions are key factors for plant production. For a sustainable integration of bioenergy plants into agricultural systems, detailed studies on their water uses and growth performances are needed. The new bioenergy plant Igniscum Candy is a cultivar of the Sakhalin Knotweed (Fallopia sachalinensis), which is characterized by a high annual biomass production. Its growth performance making Fallopia a potentially good second generation bioenergy crop. For the determination of transpiration-yield relations at the whole plant level we used wicked lysimeters, while leaf transpiration and net photosynthesis were determined with a portable minicuvette system. 

Read the paper Journal of Hydrology and Hydromechaniscs 62: 316-323 





Improving nutrient and water use efficiency of IGNISCUM – a new bioenergy crop

The new cultivars IGNISCUM Candy® and IGNISCUM Basic® of the Sakhalin Knotweed (Fallopia sachalinensis, Fam. Polygonaceae) are new bioenergy crops, which are characterized by a high annual biomass. The objectives of our study are to investigate (i) the water consumption; (ii) the interrelations between nutrient supply, biomass production, and transpiration; and (iii) the optimization of the biomass production.

Read the paper In: Böden verstehen - Böden nutzen - Böden fit machen, 3. - 9. September 2011, Berlin.



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