Agrophysiological characterisation and parametrisation of Andean tubers: Potato (Solanum sp.), oca (Oxalis tuberosa), isano (Tropaeolum tuberosum) and papalisa (Ullucus tuberosus)

摘要: Bolivia is part of the eight most important centres biodiversity and domestication plants in world, including a broad diversity Andean grains. roots tubers. A study was implemented to obtain quantitative information develop validate, simple growth potential model tubers production areas located above 3000 m altitude, analyze difference between species attributes resulting tuber production. Three potato sub-species (Solanum tuberosum ssp. andigenum tuberosum, Solanum juzepczukii) as well Oca (Oxalis tuberosa), Isano (Tropaeolum tuberosum) Papalisa (Ullucus tuberosus) were studied. Trials conducted under normal field conditions prevailing but with best cropping techniques available locally optimal growing conditions. Data on dry weight (of leaves, stems, roots) leaf area taken at several dates five trials 1993 2003. The percentage around cover also measured. Beta functions fitted data establish curves. groups have smaller cycle duration than other Crop Growth Analysis indicated three characteristics differentiating tubers: S. juzepczukii has high Relative Rate (RGR) higher mass ratio yield, due harvest index (HI) very low Net Assimilation (NAR). potatoes Leaf Area Index (LAI), RGR juzepczukii, their NAR HI are higher. quite productive for size LAI. Tropaeolum or great capacity Ground Cover (GC) LAI that not translated into greater yield. It RGR, compared all crop interpreted Light Use Efficiency (LUE) evolution light interception through linear model. LUE group more elevated Within each there no statistical value. relationship GC fraction determined both exponential relations. slope value characterises studied results reported latitudes. (c) 2007 Elsevier B.V. All rights reserved.