水稲収量の成立原理とその応用に関する作物学的研究 : 第66報稲の姿勢を任意に調節する方法の研究

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Subjecting the rice plants to nitrogen-depletion treatments, nitrogen top-dressing treatments and root-pruning treatments at different growth stages, the authors examined the effects of the treatments on the lengths of leaf-blade, sheath and inter-node born on each node by comparing the lengths with those of non-treatments, succeeded in establishing a method for controlling their lengths. 1. Increasing the supply of nitrogen is quite effective for lengthening each leaf-blade, sheath and inter-node, while decreasing the supply is most important for shortening them. 2. There is found a definite e synchronous growth among leaf-blades, sheaths and inter-nodes, i. e., taking B_1, B_2, B_3, B_4………as the 1st (upper-most), 2nd 3rd and 4th leaf-blade from above and taking S_1, S_2, S_3, S_4………as 1st (upper-most), 2nd, 3rd and 4th sheath from above and taking No, N_1, N_2, N_3………as the upper-most (between the neck-node of a ear and the node of an upper-most leaf), 2nd, 3rd, 4th inter-node from above, B_1 grows simultaneously with S_2 and N_3, and B_2 grows simultaneously with S_3 and N_4, and B_3 with S_4 and N_5, and so forth. Therefore, if B_1 is lengthened, or shortened, S_2 and N_3 are also lengthened or shortened synchronously, and if B_2 is lengthened or shortened, S_3 and N_4 are also lengthened or shortened synchronously. Thus, there are synchronously growing leaf-blades, sheaths and inter-nodes in the growth of rice plants, and so each leaf-blade grows synchronously with its own corresponding sheath and inter-node. 3. When one wants to shorten a given leaf-blade (for instance B_3), one has to restrict the nitrogen supply (by cutting roots or other methods) at or just before the time when the top of that leaf-blade (B3_) begins to appear from the immediate lower sheath (S_4), and when one wants to lengthen a given leaf-blade (B_3), one ought to top-dress nitrogen at the time when the top of the previous leaf-blade (B_4) begins to appear from the immediate lower leaf-sheath (S_5). When one wants to shorten a given sheath (for instance S_4), one has to reduce thc nitrogen supply at or just before the time when the top of B_3 start to appear from the immediate lower sheath (S_4). 4. By microscopic and anatomical observations the most susceptible developmental stage of a leaf-blade has been found to be the stage II in fig. 3. The stage II is just after the time at which the sheath of a leaf has been differentiated and the sheath as well as the blade are growing most vigorously.
1963-09-20

水稲収量の成立原理とその応用に関する作物学的研究 : 第66報稲の姿勢を任意に調節する方法の研究

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水稲収量の成立原理とその応用に関する作物学的研究 : 第66報 稲の姿勢を任意に調節する方法の研究

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水稲収量の成立原理とその応用に関する作物学的研究 : 第66報稲の姿勢を任意に調節する方法の研究