Agroecological Study of Sustainable Cultivation Systems for Cereals – Conservational tillage, biocide application and fertilization –

Research Project , Research Report 2002


Tomomi NAKAMOTO Graduate School of Agricultural and Life Sciences, The University of Tokyo
Kae MIYAZAWA Graduate School of Agricultural and Life Sciences, The University of Tokyo
Junko YAMAGISHI Graduate School of Agricultural and Life Sciences, The University of Tokyo
Hiroshi OYAIZU Graduate School of Agricultural and Life Sciences, The University of Tokyo(Research Partners)
Peter STAMP Institute of Plant Sciences, Swiss Federal Institute of Technology, Switzerland
Peter J EDWARDS Geobotanical Institute, Swiss Federal Institutes of Technology, Switzerland
Walter RICHNER Institute of Plant Sciences, Swiss Federal Institute of Technology, Switzerland
Cyrus ABIVARDI Geobotanical Institute, Swiss Federal Institutes of Technology, Switzerland

Abstract

A field experiment was conducted under the combinations of two contrasting (conventional- and reduced-) tillage, biocide application, and fertilization regimes with soybean, sugar beet, and spring wheat. Root biomass and sugar yield of sugar beet did not differ among any combinations of conservational practices. Although leaf biomass was significantly reduced under reduced chemical fertilization with manure compost (RF), it was compensated by greater specific leaf area (SLA). Greater vegetative growth was obtained with soybean and spring wheat under reduced tillage (RT), which indicated a better nutrient utilization under RT, and it was valid as well when combined with reduced biocide application (RB). However, RF could not supply as much nitrogen as conventional chemical fertilization (CF), especially in the combination with RT. Larger amount or long-term application of organic fertilization may be necessary under RT compared to the requirement under conventional tillage (CT) to compensate for lower rate of nitrogen release from organic matter.

Keywords:

Manure compost application, Reduced biocide application, Reduced tillage.