Abstract
Abstract Recently, studies on foliar application have made splendid development in the field of agronomy and in the fertilizer industry. This fact has some important meanings. First, the conception of fertilizer has gradually changed from the original meaning. Non-root parts of plants do take up nutrients from spray and other applications. This conception could definitely be proved by the use of radioactive isotopes as the tracer. Many investigations by use of radioactive isotopes, 14C ( 1 and 2 ) 32P (1, 3, 4, 5, 6, 7 and 8) 42K (9 and 10) 45Ca (10) etc. have since been conducted showing the foliar absorption of nutrients. The second important meaning is the improvement of applica tion methods of fertilizers. By the foliar application method, excellent effects which could not be carried out by the soil application method have been displayed. When fertilizers are applied to leaves of plants in critical times as a supplementary fertilizer, they can be absorbed quickly plentifully into plants. Foliar appl...
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