{'fraction_non_alphanumeric': 0.03362151777137368, 'fraction_numerical': 0.020172910662824207, 'mean_word_length': 4.920454545454546, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Effects of Soil Temperature on Growth and Quality of Onion Bulbs (Allium cepa L.) Used for Dehydration1


Three cultivars of onions used for dehydration were grown in a greenhouse at constant soil (bulb) temperatures of 13°, 18°, 24°, and 29°C. Growth of tops was best at 24° and poorest at 13°; the number of foliage leaves increased until about the time the bulbs reached half maximum diameter; thereafter the number declined, due to cessation of new foliage leaves and senescence of old leaves. In all plants at 13°, visible bulbing occurred before emergence of the scape. Bulbs matured earliest at 29° but yields were highest at 18° and 24°. The length of bulbs increased with increasing temperature, but the diameters were not significantly different, resulting in very elongated bulbs at high soil temperatures. Soil temperature had no effect on lateral bud formation (doubles). Pungency or votatile propyl sulfur compounds were highly correlated with temperature but percent dry wt, total sugars, and bulb pinking were not correlated.