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Volume 19, Issue 1
Displaying 1-9 of 9 articles from this issue
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Effect of plant growth hormone treatment on time of maturity of fig fruitsT. KUROKAMI, R. IWASA1950 Volume 19 Issue 1 Pages 1-8
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
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E. FUKUSHIMA, S. UEMOTO1950 Volume 19 Issue 1 Pages 9-12
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
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I. Survey of orchard soils. (2)Y. MORITA, M. ISHIHARA1950 Volume 19 Issue 1 Pages 13-22
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
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T. SUGAWARA1950 Volume 19 Issue 1 Pages 23-28
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESS(1) The present experiment was undertaken to prove the amount of dehydroascorbic acid, effect of photosynthetic activities on the formation of ascorbic acid, and activity of enzymes which oxidizes ascorbic acid into dehydroascorbic acid in lettuce plants.
(2) Five varieties used for experiments were New York, Imperial, May King, Wayahead, and Oak-leafed. The plants were grown under field conditions, and the samples were collected at certain definite periods.
(3) The amounts of dehydroascorbic acid and ascorbic acid in the lettuce plants were determined by the titration method with 2.6-dichlorphenol-indophenol solutions, described by FUJITA et al.
(4) A considerable amount of dehydroascorbic acid was detected in the fresh blades which were just being cut.
(5) The formation of total ascorbic acid in leaves of lettuce is affected by the photosyn-thetic activities, but no remarkable effect on the ratio of ascorbic acid and dehydroascorbic acid.
(6) It is shown by means of a ascorbic acid oxydase test that the ascorbic acid oxydase might be absent in the extracted juice, because no reaction of enzyme appeared on synthetic ascorbic acid solutions after adding the juice to it. (Laboratory of Agronomy, Faculty of Agriculture, Tokyo University, Hongo, Tokyo, Japan.)View full abstractDownload PDF (489K) -
K. YAMASAKI1950 Volume 19 Issue 1 Pages 29-38
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
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T. OTA, N. AKIYAMA, K. SUZUKI1950 Volume 19 Issue 1 Pages 39-48
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
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T. INDEN1950 Volume 19 Issue 1 Pages 49-60
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
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On the effect of harvesting dates of seeds, as well as of the setting position of seed within the same plant, upon the bolting behavior of the plant developed from those various kinds of seedsK. HAGIYA1950 Volume 19 Issue 1 Pages 61-67
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESS1. In the so-called “Home” destrict of Tokinashi-seed production in Kyoto prefecture, the seed-growers usually obtain their crops through harvesting the seeds at more or less premature condition. To make clear the exact nature of the above conventional method of seed-growing, the author examined various kinds of seeds obtained through the following ways: seeds were obtained from the individual seeding-branches on the same plant, collecting on the two different dates of maturity, at full-and pre-maturing respectively; and, moreover, each infloiescence-branch was divided into the top and basal portions, and the seeds were collected from those individual portions for examination.
2. The weight of seeds collected at their full maturity was clearly heavier than that of the premature harvesting. The seeds collected evern on the same date of harvesting differed also in their average weight between the top and basal setting within the same individual inflorescence, revealing that the seeds from the top portion were more or less lighter in weight than those from the basal portion. Again, there had been noticed the similar situation established among different inflorescence branches within the same plant, i.e., the seeds set on the upper branches of primary order were larger than those on the lower or secondary branches.
3. It was also clearly demonstrated that the growing condition of the young seedling was well correlated with the weight or size of seed, from which the seedling plant developed.
4. Bolting behaviors of those plants grown up from various kinds of seeds, such' as above stated, had shown more or less distinct difference' among each others. Generally speaking, plants grown up from the heavier seeds attained earlier to the bolting stage (including a higher percentage of bclters among the population), than the comparable plants derived from the lighter or smaller seeds. So that the premature harvesting of Tokinashi-seeds may be duely ascribed to be one of the practicable means of seed production for suppressing the premature bolting and obtaining the larger crop of root.View full abstractDownload PDF (517K) -
I. Set of pod of several varieties in relation to temperatureN. IWAMI1950 Volume 19 Issue 1 Pages 68-75
Published: March 31, 1950
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThis experiment was performed concerning the effects of high temperature in summer on the flowering and set of pods of common bean varieties in 1948.
For this purpose were used ten varieties. From the results of this experiment, set percentage of pods is generally-decreased by high temperature. But this effect is rather widely differen-tiated among these varieties, and these varieties are classified into three types, that is to say, high temperature type, medium temperature type, and low temperature type,
The varieties which have many flowers and high' percentage of set are classified into high temperature type.
The varieties of low temperature type are not adapted in Tokyo prefecture.
The varieties of medium type are possible to obtain high percentage of set by earlier sowing.View full abstractDownload PDF (547K)
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