8149: Prediction of grain yield of spring barley varieties by disease and growth characteristics from VCU testing

Østergård, H.; Kristensen, K. and Jensen, J.W. (2005) Prediction of grain yield of spring barley varieties by disease and growth characteristics from VCU testing. Paper presented at First Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR) held in Cooperation with the International Federation of Organic Agriculture Movements (IFOAM) and the National Association for Sustainable Agriculture,, Adelaide, South Australia, 21-23 September 2005; Published in Köpke, U.; Niggli, U.; Neuhoff, D.; Carnish, P. and Lockeretz, W., Eds. Researching Sustainable Systems, page pp. 154-157.

Summary

Fifty spring barley varieties grown under organic as well as conventional growing conditions in experimental fields in four combinations of year and site were studied. The yield varied much within and between environments (years and sites) and systems. Further, the variation between varieties was substantially and it differed between different environments and systems. Associations between observed grain yield of these varieties and disease and growth characteristics assessed in the official conventional variety testing were compared between the organic and the conventional system. Using factorial regression analysis, the best model for predicting the observed grain yield each year from these characteristics the previous year was found. In this model, the residual variance component for varieties was lower for observations from the conventional growing system than from the organic growing system implying that the VCU-characteristics better predicted the results from conventional growing system. The implications for organic variety testing are discussed.

Archive Staff Only: edit this record