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人类营养学家有一种看法:认为每一个人每年要吃70～80公斤的水果才能保证一定的营养水平。而目前世界水果的年产量是一亿三千万吨,也就是说,每人每年平均为35公斤。所以,假如要维持每个大人和孩子的身心健康,就应在不远的将来大幅度地提高水果的产量。果树的每个树种都有很大的增产潜力。以苹果为例:在波兰每公顷苹果的产量为八吨,而在美国则为20吨,个别的高产记录比这更高。1963年我亲眼看到在塔斯曼尼亚、
Human nutritionists have a view: that everyone should eat 70 to 80 kg of fruit each year to ensure a certain level of nutrition. At present, the annual output of fruit in the world is 130 million tons, that is to say, the average annual output per person is 35 kg. Therefore, if we are to maintain the physical and mental health of every adult and child, we should significantly increase our fruit production in the near future. Each species of fruit tree has great potential for yield increase. In the case of apples: In Poland, the production of apples per hectare is 8 tons, while in the United States it is 20 tons. Individual high yield records are higher than this. In 1963 I witnessed in Tasmania,