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A.B. Jansen Annual Report applied autumn crop beefsteak tomatoes Buitelaar calcium carried Chinese cabbage chrysanthemum colour concentration corms courgette crop in Dutch cropping period cucumber cultivar trials differences dry matter duplicated trials Dutch EC levels effect eggplant experiment flower freesia fresh weight Fruit 40 fruit weight fungicides further trial glasshouse glasshouse climate Groent Groenten en Fruit growers growing grown growth harvest heated crop higher humidity increased infection investigation iprodione keeping quality Klapwijk leaf leafminer lettuce mmol mS.cm mS/cm Naaldwijk night temperature nitrate nutrient solution nutrition Outch oxamyl percentage plant density planting date planting distance production radish reduced respectively rockwool root Sappemeer seedhouses soil Sonneveld spray spring crop standard cultivars stem Stolk storage substrate sweet pepper tested in duplicated thermal screen thiram thrips tipburn treatments truss Tuinderij Uffelen Venlo ventilation VerticIllium virus weeks whitefly yield