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Annual Report 1976 applied autumn crop average biological control bromide CAOp Chinese cabbage chrysanthemums corms cucumbers cultivar trials differences disease duplicated trials Dutch effect eggplants Encarsia formosa endive fertiliser flower buds freesias fruit weight fungicides further trial gherkins glasshouse glasshouse climate GLASSHOUSE CROPS glassiness grading Groenten en Fruit growers growing period grown growth regulators harvest horticulture increased investigation irrigation water January Klapwijk kohlrabi labour requirements leaf lettuce levels Maaswinkel manganese methyl bromide Naaldwijk night temperatures nitrogen nurseries nutrient solution nutrition obtained peat plant density plant raising plant weight planting distances potting compost produced quintozene radish reduced rockwool root seed shelf soil heating soil temperature sowing sown spray carnations spring crop standard cultivar standard cvs stem Stolk sweet peppers symptoms thiram thrips tomato crop tomato plants treatments truss Tuinderij untreated viroids weeks white Spanish radish yields