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首页> 外文期刊>日本作物學會紀事 >Analysis of Yield-Determination Process and Its "Application to Yield-Prediction and Culture Improvement of Lowland Rice : LXXVII. Relation between nitrogen content and starch content in rice plants, with special reference to a critical evaluation of the diagnosis by iodine reaction on nitrogen requirement at the panicle initiation stage
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Analysis of Yield-Determination Process and Its "Application to Yield-Prediction and Culture Improvement of Lowland Rice : LXXVII. Relation between nitrogen content and starch content in rice plants, with special reference to a critical evaluation of the diagnosis by iodine reaction on nitrogen requirement at the panicle initiation stage

机译：产量测定过程分析及其对低地水稻产量预测和培养改进的应用 - LXXVII。水稻氮含量与淀粉含量的关系，特别参考碘反应诊断对氮要求的关键评价在穗发芽阶段

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On the basis of the fact that the nitrogen content was negatively correlated with the starch content in rice plants, some trials had hitherto been conducted which had intended to diagnose the nitrogen requirement of rice plants at the panicle initiation stage by knowing the relative starch content which was easily known by the iodine reaction in leaf-sheaths. The authors, therefore, examined from 1958 to 1965 the relation between the nitrogen content and the starch content at the neck-node initiation stage (the initial stage of panicle differentiation) as well as the heading stage with a special view to evaluating the diagnosis of nitrogen requirement by iodine reaction as above mentioned. The results may be summarized as follows. 1. A high and positive correlation coefficient was always found between the starch content in the rice plant and the staining degree of a leaf-sheath by iodine solution. In particular, the strongest correlation was obtained when the third leaf-sheath counted from the uppermost developing leaf was used. 2. In cases of an identical variety being used and transplanted on an identical date under an identical season with different amounts of basic ferfilizers without top dressing, a strong and negative correlation coefficient was always found between the nitrogen content and the starch content in the rice plant. However, in case of varieties, transplanting dates, seasons and topi dressings being different, the correlation coefficients markedly decreased in most cases. 3. The nitrogen content seemed to be negatively correlated with the starch content in the rice plant by nature. The correlation coefficient between them, however, decreased markedly when the rice plant had been subjected to abnormal weather conditions or top-dressed with nitrogenous fertilizers just before the plant was sampled, presumably because the nitrogen content had not yet come to be balanced with the starch content in the plant. 4. The effect on yield of top-dressing at the panicle initiation stage had no connection with the content of nitrogen or starch in the plant at the neck-node initiation stage, but it was closely connected with the number of spikelets per unit area, i. e. the effect was progressively remarkable with the decrease in the number of spikelets. 5. Only in the following case one might decide, from the diagnosis by iodine reaction, the top-dressing at the panicle initiation stage to be necessary for the rice plant, i. e. only whenth e rice plant showed not only a severe iodine reaction but also a small amount, of nitrogen absorbed at the neck-node initiation stage and the plant could also be estimated to absorb a small amount of nitrogen during the period from the neck-node initiation stage to the final stage of spikelet initiation : in other words, only when the plant might be expected to have a small number of spikelets per unit area : and moreover the plant could be expected to be subjected to fine weather conditions after heading. Accordingly, the diagnosis by iodine reaction in the rice plant to judge the necessity of the top-dressing to the plant at the panicle initiation stage may be said to be of little utility value.
机译：在基于氮含量与水稻植物中的淀粉含量与淀粉含量呈负相关的事实，迄今为止已经进行了一些试验，该试验旨在通过了解相对淀粉含量来诊断藻植物在藻植物的氮要求在叶子护套中碘反应易于知道。因此，作者从1958年到1965年检查了氮含量与颈部节点发起阶段（穗分化的初始阶段）之间的关系，以及标题阶段，具有评估诊断的特殊视图如上所述，通过碘反应的氮要求。结果可以概括如下。在水稻植物中的淀粉含量和碘溶液中的叶子鞘的染色程度之间始终发现高和正相关系数。特别地，当从最上面的显影叶中计数的第三叶片鞘时，获得最强的相关性。 2.在相同的季节下使用和移植相同的季节在具有不同量的碱性食子玻璃的情况下使用和移植而没有顶部敷料，在氮含量和米中的淀粉含量之间始终发现强烈和负相关系数植物。然而，在品种的情况下，移植日期，季节和TOPI敷料不同，在大多数情况下，相关系数显着降低。 3.氮含量似乎与自然稻草中的淀粉含量负相关。然而，当水稻植物经受异常的天气条件或在植物被取样之前含有含氮肥料的含有含氮剂时，它们的相关系数显着下降，可能是因为氮含量尚未与淀粉均衡植物中的内容。 4.对穗起始阶段的顶部敷料产率的影响与颈部节点发起阶段的植物中的氮气或淀粉的含量无关，但它与每单位面积的小穗数密切相关，一世。 e。随着尖峰数量的降低，效果逐渐显着。只有在以下情况下，只有一个人可以决定，从碘反应的诊断中，果实引发阶段的顶部敷料是水稻植物所必需的，i。 e。只有在颈部节点发起阶段中吸收的严重碘反应而且少量的米米植物也仅显示氮气，也可以估计在颈部节点的时段中吸收少量氮气起始阶段到穗尖头启动的最终阶段：换句话说，只有当植物可能预期每单位面积少量小穗时：此外，植物可以预期在标题后受到良好的天气条件。因此，可以据说可以据说米植物中碘反应在水稻植物中判断穗起始阶段的植物的必要性，但效用几乎没有。

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