Tomato growth and yield : quantitative analysis and synthesis

摘要: In this thesis, the responses of tomato crop growth and yield to greenhouse climate (light, temperature C0 2 concentration) management (plant density fruit pruning) were analysed quantified. A simulation model, TOMSIM, was developed, using existing explanatory models for tomato, validated.Sink demand, influenced by pruning (retaining two seven fruits per truss), did not influence dry matter production unit intercepted radiation. Measurements in daylit phytotron compartments showed an increase photosynthesis with 17%, when concentration increased from 500 900 μmol mol -1 . Based on periodic destructive measurements 12 experiments, a efficiency 2.5 g MJ PAR (photosynthetically active radiation) observed. At end most 54-60% total produced partitioned into ratio between leaf stem weight 7:3. For late autumn plantings, only 35-38% fruits, owing poor set. From first harvest onwards, (almost) constant partitioning existed: 70% distributed number truss seven.Dry strongly plant. Generative sink strength appeared be proportional (two truss). Temperature (18-24°C) assimilate supply (varied plant density, 1.6-3.1 plants m -2 ) had no direct partitioning. double-shoot plants, where either all trusses removed one shoot or every other both shoots at anthesis, same, supporting assumption common pool, i.e. phloern transport resistance partitioning.In potential rate is simulated, based rate, light interception, maintenance respiration (R conversion carbohydrates structural matter. The canopy assumed composed leaves identical photosynthetic respiratory characteristics. Dry simulated strengths organs, organ described its rate. model validated thoroughly, level submodels as whole, independent experimental data well commercially grown crops. general, predictions agreed measurements. Simulated very sensitive LAI simulation, especially low LAI. intensity and/or high biomass, underestimated, likely result overestimation R under these conditions. Simulation results improved, related metabolic activity, relative specific area, flower abortion requires more investigation. possibility generalisation (greenhouse) crops, possible applications grower's decisions, research education are discussed.