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12 feet 2.mil polyethylene 24 inches 3.inch cups 4.6 Red Oct 5,000 foot candles 60 foot area adequate AGRICULTURAL EXPERIMENT STATION ammonium nitrate amount average marketable yield batten strips breakage building cloudy weather College house construction cost eaves exhaust fan EXPERIMENT STATION BULLETIN flower buds flower clusters fruit set gas heaters glass house Gulf States Market half.round posts heating system heavy twine suspended I.II Ianuary IIIII inch lumber inside layer layer of 2.mil light for satisfactory light intensity MISSISSIPPI AGRICULTURAL EXPERIMENT moist air moisture condensation nailed nitrogen non.burned nutrients overhead wire percent Pink Oct plastic greenhouse plate Pollination props purlin ridge board ridge ventilators roof pitch round posts September side soil STATION BULLETIN 563 temperature tested throughout the house tomato production trained to heavy Tuckcross Tuckers Forcing Vented heaters ventilator shutters ventilator sills volume of air winter