Effect of Nitrogen Composition in Culture Solution on the Growth of Rice Seedlings Raised on a Cotton Mat Spread on Hydroponic Apparatus for Vegetables.

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Effect of the form and composition of nitrogen in a culture solution on the growth of rice seedlings raised on a cotton mat spread on a hydroponic apparatus for vegetables was investigated. The nitrogen composition, NH4-N:NO3-N, in the Kimura B solution was modified as follows:28%:72% (plot 1), 44%:56% (plot 2), 72%:28% (plot 3), 100%:0% (plot 4). Plant length, root length and root dry weight were greatest in plot 1 followed by plot 2, 3 and 4. In plots 1 and 2, the plant length was same level as that in seedlings raised in a box. However, the seedlings in plots 1 and 2 had longer roots than those raised in a box, and were suspected to be injured by transplanting. Thus, nutrient application was modified to change the plant form as follows:the culture solution was not applied during the first seedling-raising period, NO3-N-rich culture solution (NH4-N:NO3-N=28%:72%) was applied during the second period, and culture solution containing only NH4-N as the nitrogen source was applied during the last period. The seedlings raised by this method had nearly the same plant length and root length as those raised in boxes. Moreover, there was no distinctive difference in growth characteristics after transplanting between the seedlings raised by this method including different nitrogen compositions and raised in box.
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