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在夏威夷,番木瓜园内的植株生产期比过去长,因为实行机械化采果,能采摘过去用手不易采到的老树高处的果实。为此,我们的工作重点须从幼龄番木瓜结果树的营养研究转移到老龄植株上来。在营养研究中,把7—24个月龄的植株作为幼龄树,24—48个月龄的作为老龄树。与幼龄树相比,通常老龄树的茎较高大,根系分布广,但叶片较少,产量也较低。磷肥对幼龄树很重要,而对老龄树则不一定必要;氮和钾对老龄树的健康生长和结果是必要的。本试验是研究老龄番
In Hawaii, the production of plants in the Papaya Garden is more productive than in the past because of the mechanized harvesting of the fruit that can be picked up from the height of an old tree that was hard to reach by hand. For this reason, our work must shift from nutritional studies of young Papaya tree to aging plants. In nutritional studies, 7-24 months old plants are used as young trees and 24-48 months old as old trees. Compared with young trees, old trees usually have tall stems, wide root systems, fewer leaves, and lower yields. Phosphate fertilizer is important for young trees, but not necessarily for older trees; nitrogen and potassium are essential for the healthy growth and outcome of the aged trees. This test is to study aging