@article{oai:nara-edu.repo.nii.ac.jp:00009174,
 author = {石井, 滋規 and 中田, 恭二},
 issue = {2},
 journal = {奈良学芸大学紀要},
 month = {Feb},
 note = {We made an outer observation upon the effects of nitrozen split application as basic fertilization and top dressing in the early cultivated lowland rice, preparatory to the studies on availing mechanism of nutriments in it. Basic fertilizer was supplied 4 days before tranplanting (May 12th) with 3.75kg per 10 a of phosphorus, 7.5kg of potassium, and 7.88kg of nitrozen in the Control (Plot 1 - no top dressd) or 6.75kg of it in the top dressed (Plot 2 - Plot 4). The top dressing was given 47 days before earning in Plot 2, 22 days in Plot 3 and 10 days in Plot 4. These times almostaccord withthe climax stage of tillering, the early stage of panicle formation and the last stage of reduction devission of PMC, respectiely. And the total nitrozen in every top dressed plot was made equal to it in the Control. Colum length showed no clear difference among all the plots. The number of tillers being the largest in the first top dressed (Plot 2) till the earning period, thereafter, however, the third top dressed (Plot 4) exceeded it in number of tillers. But the survival percentage of tillers was the highest in the second top dressed (Plot 3), while Plot 2 showed the lowest percentage. Next to Plot 3, Plot 4 was the highest in it. Total straw yield was equal among all the experimental plots except Plot 2 which had the largest yield. Grain yield was the most excellent in Plot 2, next to it in Plot 3, and the worst in the Control. (The index numbers of grain yield were 100, 117, 109 and 104 from Plot 1 to Plot 4 respectively.) Consequently, the ratio of grain yield to straw yield was the highest in Plot 3, the second in Plot 2 and the lowest in the Control. From the result of an analytical investigation on the yield, the followings were proved. (1) The increase of total grain yield in Plot 2 was brought about by the increase of the number of panicles per hill and the partial increase of grains per panicle. (2) Plot 3 gained some increment of yield by the increase of grains number per panicle and each grain weight. (3) In Plot 4, though the number of panicles per hill was much increased by the last top dressing, the number of grains per panicle was the smallest. And that, the abortive kernel percentage in it was the highest. But on the other hand, the weight of a fully ripened kernel in Plot 4 showed the largest in every experimental plot. And the composite result of these facts seemed to have increased the grain yield of Plot 4 as compared with that of the Control, though its degree was slight.},
 pages = {127--135},
 title = {早期栽培水稲における肥効発現機構の研究　I．窒素分施の影響（予報）},
 volume = {8},
 year = {1959}
}