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acid Agric ammonia and nitrate Appl autoclaving average BEWLEY Biol blotchy fruit Blotchy Ripening Carnation cent Cheshunt chloropicrin Chron chrysanthemum colour compounds concentrations Crop Yield cucumber cultures day after steaming deficiency deuteronymph Didymella discs disease ecdysis eelworm effect experiments female mites floating foliage formaldehyde fungi Fungicides fungus Gardeners given in Table glasshouse Glasshouse Crops glasshouse soils growth hind-gut hoof and horn Hort House increased inoculated instar investigation isolated larvæ leaf leaf-discs leaflet leaves lesions lycopersici manure Maytime moisture Mosaic nitrate nitrifying nitrogen normal number of eggs nutrient solution observed obtained OWEN parathion percentage potassium pots Red Spider Red Spider Mite rhizosphere root surface samples seed seedlings showed soluble SPEYER spores steam sterilization steamed plots steamed soil submerged sulphate sulphur symptoms temperature tensiometers tests Tomato tomato plants tons per acre trusses U/F ratio unsteamed urea-formaldehyde variety virus water-soluble