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aeration air temperatures Alfalfa amount aphids applied in solution bright days calcium nitrate clay pots containing controlled cooler Crops Research Division daylengths dissolving distilled water early strain evaporation ferbam flower fluorescent lamps fungicide germination glass glazed crocks grams gravel greenhouse bench greenhouse temperatures growing plants headhouse heat holes inches late strain legume seedlings magnesium sulfate manure Minor elements mixed nitrogen fertilizer nutrient solution obtain organisms over-watering Pasture Laboratory Pasture Research Laboratory Petri dishes phosphorus photoperiodic responses plant growth plant material plant nutrients PLANT PROPAGATION plants become larger potash potassium dihydrogen phosphate potassium nitrate pots or flats potting soil procedures red clover reduce damping-off Regional Pasture Research sand satisfactory seed shading compound short light periods side vents soil fertility studies soil surface solution culture Sow bugs spray steam stems sterilizer stock solution stolon superphosphate thrips tillers top vents U. S. Regional Pasture usually vegetative growth ventilation vermiculite water loss weeks