水稲収量の成立原理とその応用に関する作物学的研究 : LIII. 品種の早晩と栽培時期の早晩による幼穂発育経過の差異と発育段階の認定法 (2)

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Further experiments were conducted with a view of clarifyillg the developmental differences of young panicles in different maturing varieties as affected by the time of cultivation and of establishing a method for identifying the developmental stages which can hold true in any circumstances. 1) Effects of early cultivation on hastening the time of first bract differentiation (which is the initiation of ear-primordium formation) are more remarkable in early varieties than in late varieties. Therefore, the larger varietal differences are found in the date of initiation of ear-primordia when rice-plants are transplanted the earlier. 2) The number of days required from the time of transplanting to the stage of the first bract differentiation as well as that required from the first bract differentiation to the heading are small in early varieties and large in late varieties, and in any variety, moreover, both the number of days are the larger in the earlier cultivation. From this fact it is confirmed that the number of days required from the initiation of ear-primordium formation to the heading, which has been hitherto considered to be nearly constant in general, varies considerably with the variety and cultiVation time. And it has been also made clear that the differences in number of days required from the initiation of ear-primordia to the heading due to different varieties and different cultivation times can be ascribed to the differences in the total number of leaves emerging on the main culm and the varietal differences in the photoperiodic and thermic sensitivities of the plant. 3) As the results of examinig the method for identifying each developmental stage which should hold true in any circumstances, it has been proved that a corrected "foliar age index"can satisfactorily be used. (c.f. Bull. Natio. Inst. Agr. Sci. Series A 5) The corrected "foliar age index"(Y) is calculated by the following formula, taking 16 in the total number of leaves on the main culm as a standard. Y=y+(1OO-y)×16-χ/10 Where y is indicating the "foliar age index"at a given stage, χis the total number of leaves on the main culm of a given variety used, which is fairly constant as a varietal character under a given cultural condition. By the way, "the foliar age index"is represented by the percentage ratio of the number of leaves which have actually emerged on the main culm by a given time to the total number of leaves to be expected by the time of heading on the main culm
日本作物学会の論文
1959-12-20

水稲収量の成立原理とその応用に関する作物学的研究 : LIII. 品種の早晩と栽培時期の早晩による幼穂発育経過の差異と発育段階の認定法 (2)

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