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八、各部位的大小与无机要素其次,探讨一下无机要素的问题。首先,为了了解各种要素供给的有无与叶身长的关系,将缺乏各要素稻株的主秆各叶位叶的叶身长示之于图16。根据图16,可以认为,氮、磷酸和硫一缺乏,主秆的叶数就减少,各叶位叶的叶身长也变短,缺乏钾和钙的稻,虽然不那样显著,但叶身长也变短。惟有镁供给不足的稻,叶数多,叶身也长。根据上述事实,可以认为:为了使叶增大,必须在此叶伸长时,充分供给氮、磷和硫,而钾和钙最好也能使其须利地流入。
Eight, the size of various parts and inorganic elements Second, to explore the issue of inorganic elements. First, in order to understand the relationship between the presence or absence of supply of various elements and the length of the leaves, the leaf length of each leaf of the main culm lacking each elemental rice plant is shown in FIG. 16. According to Fig. 16, it can be considered that nitrogen, phosphoric acid and sulfur are deficient, the number of main culms is reduced, and the leaf length of leaves is also shortened. Rice lacking potassium and calcium, although not as significant, Shorter. However, insufficient supply of magnesium rice, leaf number, leaf body is also long. From the above facts, it is believed that in order to increase the size of the leaves, nitrogen, phosphorus and sulfur must be sufficiently supplied at the time of elongation of the leaves, and potassium and calcium are desirably also allowed to flow in sharply.