1) This study was carried out in 1962-1964 to make clear the relation between the time of distillation of lemon-grass and the yield and citral content of the oil, and to know the effect of drying of leaf material on the relation.
2) The yield of oil per unit time was always highest at the early stage of distillation, and decreased remarkably with the time of distillation.
3) When the leaf material was dried suitably, the yield of oil at the early stage of distillation tended to increase somewhat, furthermore, the time required for distillation of the total oil in the leaf seemed to be a little shorten.
4) The citral content of the oil was highest in the short distillation, and decreased gradually with the time of distillation.
5) When the leaf material was dried suitably, not only the general increase of citral in the oil was recognized, but also the variation in the citral content of the oil due to the time of distillation was found to be considerably smaller.
6) The relation between the yield of citral from the leaf and the time of distillation was similar to that in the case of the yield of oil, although the ratio of the yield of citral per unit time was somewhat higher than that of the yield of oil at the early stage of distillation and decreased with the time of distillation more remarkably as compared with the case of the yield of oil.

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This experiment was carried out by pot solution culture using two varieties, H-4 and Murungakayan-302, in 1959 as a part of “studies on sterility of indica rice”. Plants were grown with different treatments, consisted of application or depletion of nitrogen at different stages of growth.
The main results obtained from this experiment are as follows :
1. Murungakayan-302 gave remarkable decrease in yield accompanied with high sterility when nitrogen applied up to heading stage and the highest yield in this variety was obtained when nitrogen was applied up to five weeks prior to heading and depleted from this stage onward.
2. H-4 gave the highest yield when nitrogen was applied up to three weeks prior to heading and it can produce a fairly high yield even when nitrogen was applied up to heading stage.
3. Nitrogen applied during the reproductive growth period to the plant which has grown without nitrogen during the vegetative growth period caused serious sterility.
4. It was observed that the optimum concentration of nitrogen in culture solution for indica varieties was very much lower than for japonica varieties. The defference might be attributable to the difference in the activity of nitrogen assimilation in the plant.
5. Sensitivity of indica rice to nitrogen might be playing a role in the occurence of high sterility percentage.

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1) Under different soil moisture contents, pot experiments were carried out in the greenhouse in 1958 and 1963 to know the relation between the soil moisture and the growth, yield, and cocaine content of the coca plant.
2) About 90-80% of the water capacity of the soil gave the best growth and the highest yield of leaves, on the other hand, under dry condition below 40% or over-moist condition near 100%, a remarkable retardation in growth was recognized.
3) The cocaine content of the leaves seemed not to be affected by the soil moisture.

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The experiment was carried out to examine the effect of soil temperatures in the fruitingzone upon the development of peanut seeds. Soil-temperature in the fruiting-zone was treated with low (20°C), middle (25°C) and high (30°C) throughout the development of seeds.
The results of experiments summarized are as follows:
1. The number and the length of ginopores in the soil of the fruiting-zone were the most plentiful and the longest at the low temperature plot, and remarkably few and short at the high temp. plot. At the middle temp. plot, they were middle compared with other plot, and almost the same with the plants cultivated in the field.
2. At the middle temp. plot, the number of pods was less than that at the low temp. plot, but as the weight of one-seeed-weight was heavier, total weight exceed the latter. At the high temp. plot, one-seed-weight was middle, but the number of pods was the least of all, so total weight was the lightest.
3. Compared the seeds weight on every node of the branch among three plots, it was the heaviest at middle temp. plot, next at low temp. plot and then at high temp. plot. But, at the tree-top part of the node, the seeds weight at high temp. plot was slightely heavier than others.
4. Compared one-seed-weight fully matured, it was the heaviest at middle temp. plot. It followed next at low temp. plot and then at high temp. plot. But as the inside space of seeds became large according the temperature went up, the appeared volume of seed was the largest at high temp. plot and the smallest at low temp. plot.
Then, compared the appeared specific gravity of them, those at high temp. plot were the lightest, and it followed at middle temp. plot and then at low temp. plot. But as for the true specific gravity, the order was contrary.
5. The oil content of the seed was large at high and middle temp. plot and was remarkably small at low temp. plot.
The iodine value of the oil was the highest at low temp. plot and was the lowest at high temp. plot.
6. The protein content was contrary with the oil content: it was large at low temp. plot and small at middle temp. plot. But at high temp. plot, the protein content was always large, and as I had some question to this result, I will hereafter re-examine this point.

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1. This is a report on the grafting of Castanea crenata genus stocks in view of the variation of the stock trees. This experiment would help increase production of the lumbers and eatable fruits by utilizing the plentiful resources in fields and mountains.
2. This Temperate Zone method may not be wholly applicable in tropical plateaus, but more study and device may lead to its feasibility.
3. Because of the hard wood some remnant of woody tissue tends to remain on the low end of the whittled part of the other genus stock which is meant for grafting symbiosis with Castanea crenata. This remaining lignus must be removed. The middle part of the cambius had better be whittled.
4. Longtime removal of central leaves of Castanea crenata after the summer solstice and filmpacked scions of that part are also effective for grafting on other genus stocks.
5. Darkness does not make grafting unions. Sunlight is necessary. Even in case of Quercus acutissima Carruth and Quercus serrata Thunb renewal is desirable to redress the balance on and under the soil. As for Castanopsis cuspidata Schottky and the like, care must be taken to let branch groups remain. Scions, stocks and their grafting parts must be protected from insects.
6. In order to avoid risks in top grafting, the non-whittled part of the processed whittled scion will be bound in the bud-exposure method, and the whole bunch of such scions will be filmpacked and then grafted on the same day or the next day or within seven days, just as on the same genus stocks of Castanea crenata Sieb. et Zucc. Another recommendable method is the filmpacking processing with water-soluble plastic paint of the upper part of the scion with one bud exposed or each bud peocessed. The whole scion may be processed after a whittled part is made.
7. Grafting of upside-down scions is recommendable for chestnut fruit collection, and normal grafting fo the lumber collection.
8. Yearly growth of Castanea crenata grafted on other genus stocks is similar to that on the same genus stocks.

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