This volume contains the Proceedings of the International Conference on Effects of Crop Rotation on Potato Production in the Temperate Zones. This conference was held in the International Agricultural Centre at Wageningen, The Netherlands, August 14 - 19, 1988, under the auspices of the European Association for Potato Research (EAPR), the Potato Association of America (PAA) and the Dutch National Council for Agricultural Research (NRLO). The length of rotations affect the performance of potato crops and yields are often reduced if rotations are too short. The kinds of crops within a rotation will also affect potato performance, especially those grown in the previous season. It was a major aim of the conference to bring together specialists of various disciplines to examine these determinants of potato yield. The Organizing Committee is glad that all relevant aspects of the theme are highlighted in these proceedings. The contents of the contributions are primarily left to the responsibility of the authors. J. Vos C.D. van Loon G.J. Bollen ORGANIZATION OF THE CONFERENCE The European Association for Potato Research (EAPR) and the Potato Association of America (PAA) nominated representatives in the Conference Committee. PAA was represented by prof. dr E.E. Ewing (Ithaca, USA) and by dr R.E. Thornton (Pullman, USA); EAPR was represented by prof. dr J.C. Holmes (Edinburgh, UK), ir C.D. van Loon (Lelystad, NL), and dr ir J. Vos (chairman; Wageningen, NL).

Inhalt

Section Crop Rotation and Effects on Yield and Quality of Potato.- Effects of cropping frequency on potato production.- Commercial production results as a basis for crop rotation decisions.- Results of twenty-four years of crop rotation research at 'De Schreef 'experimental site.- Twelve years of continuous cropping and short rotations of potato at the 'PAGV1' experimental site.- Relative performance of potato cultivars in short rotations.- The upper limit for the frequency of potatoes growing in rotations in northern Poland.- Section Crop Rotation and Soil Properties.- Effects of the crop rotation system on soil physical behaviour and relations with potato yield.- Effect of legumes on soil mineral nitrogen and response of potatoes to nitrogen fertilizer.- Section Crop Rotation and Nematodes.- The role of cyst nematodes in crop rotations in potato.- Significance of crop rotation and cultivars resistant to potato cyst nematode on potato production.- The role of crop rotation systems on non-cyst nematodes affecting potatoes in the temperate zones.- Section Crop Rotation and Bacterial Diseases in Potato.- Bacteria and potatoes in crop rotation systems.- Cyanide-producing rhizosphere pseudomonads: a factor limiting potato root growth and tuber yield in high frequency potato-cropping soil?.- Increase of potato tuber yields in short rotations of potato by seed tuber treatments with fluorescent Pseudomonas spp..- Section Crop Rotation and Fungal Diseases.- Crop rotation and the occurrence of fungal diseases in potatoes.- Incidence of soilborne potato pathogens in six crops used in rotation with potatoes.- Effect of clover, ryegrass and winter wheat used in rotation with potatoes on the incidence of disease and soilborne pathogens in potatoes.- Incidence of soilborne pathogens in potato related to the frequency of potato growing on a clay loam.- Effects of leguminous crops on potato production and on incidence of Verticillium dahliae in various crop rotations with potatoes.- Dynamics of damage from Rhizoctonia solani in potato fields.- Colonization of potato by Rhizoctonia solani as affected by crop rotation.- Rhizosphere microflora in three potato cultivars as affected by season of production under Assiut conditions.- Section Agronomic and Physiological Aspects of Crop Rotation.- Some negative aspects of crop rotation.- Crop characteristics and yield reduction of potato due to biotic stress in short crop rotations.- Crop rotation - an important aspect in integrated potato production.- Conclusions and recommendations for further research from the International Conference of Effects of Crop Rotation on Potato Production in the Temperate Zones.