上海大规模栽培梨树始于1958年,当时上市最早的有“八云”、“真输”等品种,由于果实小,外观不理想,产量也不高,不能适应生产和市场的需要。为此,于1972年从河北果树所引入“早酥”等梨品种,通过品种比较和丰产栽培试验,认为“早酥”梨具有早熟性,在7月底8月初即可采收,能提早供应5～7天。另外,“早酥”还具有青皮、大果、肉细、汁多、产量高等优点,它不仅可调节市场水果淡季,而且有利于提高生产者的经济收入和劳力安排。目前郊区的种植面积在400亩以上,且在不断发展中,若高接在晚蜜梨上,经济效益更大。一、生长特点“早酥”在上海的长势极旺,枝条直立粗壮。六年生干周平均30厘米,株高429厘米, Large-scale cultivation of pears in Shanghai began in 1958, when the market was first listed “eight clouds”, “real lose” and other varieties, due to the small fruit, the appearance is not ideal, the yield is not high, can not adapt to the needs of production and the market. To this end, in 1972, introduced from Hebei fruit tree “early crisp” and other pear varieties, through the comparison of varieties and high yield cultivation test, that “early crisp” pear with precocity in early July early August can be harvested, early supply 5 ~ 7 days. In addition, “crisp morning” also has the advantages of green skin, big fruit, thin meat, juicy, high yield, it can not only regulate the off-season market fruits, but also help to improve the producer’s economic income and labor arrangements. At present, the cultivated area in the suburbs is more than 400 mu, and in the continuous development, the economic benefits are greater if the planting area is high in late pears. First, the growth characteristics “Morning Crisp” growing in Shanghai is extremely prosperous, branches erect robust. Annual dry weeks average 30 cm, height 429 cm,