多年生溫帶果樹英文版-資料下載頁
2025-01-21 14:41本頁面
【正文】 protein and lipid. Usually hand harvested. ? Domestication slow growing and frequently vegetative reproduction. ? Used in all cultures, but not major in any today. ? Many nut crops grown on arid, agriculturally marginal lands where labor is cheap. Temperate nuts ? The major nut crops are: walnut (English), almond, and cashew (discussed under Tropical Nut Crops). Ranking should consider both tonnage and dollar value. ? From the archaeological record, it is clear that many nuts were eaten in the past. Acorns and hickory nuts ? Acorns and hickory nuts were major food plants of many American Indian groups of the eastern . and also of California. Acorns, fruits of oaks, Quercus sp. Fruit of Carya sp. in southern Illinois ? Walnuts, pecans, almonds, chestnuts, filberts or hazel nuts are native to temperate regions of the world. ? Pecans are the only mon nut to e from the New World. ? Peanuts are native to the South American noncenter (discussed under Legumes). ? In contrast to the fruits discussed above, nuts are dry fruits. ? The edible portion is the embryo, which has enlarged cotyledons. ? Table , p. 60, nutritional information. Walnuts and Pecans ? The English walnut (Juglans regia, Juglandaceae) (native to Iran) is the most important temperate nut crop. ? In the United States, most walnuts grown in California. Rich in oil. ? The pecan (Carya illinoensis) is native to North America. Native to south central . and Mexico. ? Paper shell varieties now often cultivated. Pecan orchards are mon in the South, ., in Texas, Oklahoma, Geia etc. Some in Australia and S. Africa. Fruits of Juglans regia Almonds (Prunus amygdalus, Rosaceae) ? Almonds belong to the same genus as the fruit crops we just discussed. ? The removal of the leathery mesocarp leaves the seed inside the endocarp. ? The seeds of some cultivars are highly toxic. Sweet and bitter almonds. ? Almonds originally cultivated as an oilseed crop and later became a nut crop. ? In the ., almonds mostly grown in California. Grown petitively because of mechanization. ? High in protein. Prunus amygdalus, almond Hazel nuts (Corylus avellana, Corylaceae) ? Hazel nuts native to the Old World. This is the mon cultivated species. ? Other Corylus species occur in the New World, ., Corylus americana. ? Hazel nuts are much more popular in Europe than here. ? In the ., most e from Oregon (about 95%). ? High in oil. Corylus avellana, hazel nut
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號-1