As the first step of an investigation of the influence of sorrounding conditions up on the fertilizer ratios, the writers were intended to study the relation of temperature to that ratio of the fertilizer given to wheat and rice plant. And the results obtained was already published in this journal vol IX (1935) and vol XI (1937)respectively.The present paper embodies the result obtained on the relation between the rainfall and the fertilizer ratios given to wheat plant.The following equation in the case of P_2O_5 to N was found to denote clearly the relation existing between the ratio and the rainfall. [numerical formula] [numerical formula] where R_1 : annual rainfall R_2 : rainfall during the growth perio of the plant. This indicates that the ratio of P_2O_5 to N is high at the district of high rainfall, decreasing lenearly as the rainfall decreases. So, the ratio as a function of both temperature and rainfall is [numerical formula] [numerical formula] In the case of K_2O to N, the following equation was obtained obtained. [numerical formula] [numerical formula] This represents also that the same tendency of relation between the rainfall and the ratio is seen even in the case of K_2O to N. So, the ratio as a function of both temperature and rainfall can be represented as follows : - [numerical formula] [numerical formula]

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In this Part experiments were made on the broad bean bacteria. The results obtained are as follows : I. In presence of inorganic nitrogen alone : (a) Ammoniacal and nitric nitrogen are rapidly utilized, while the disappearance of nitrous nitrogen is slow. (b) It is found that reduction of nitrate to nitrite takes place distinctly, not followed by further reduction of nitrite to ammonia. II. In associative presence of two forms of inorganic nitrogen : (a) Selective consumptions of ammonia are considered in either of the media containing ammonium nitrate or ammonium nitrite. (b) Nitrate is more assimilable than nitrite when they are present in association as nitrogenous nutrients. It may be suggestible that nitric nitrogen would probably be utilized throngh a reduced form, that is, nitrous nitrogen, by the broad bean barteria under the experimental conditions.

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To a highly acidic mineral soil of tertiary system added CaCO_3 in ascending rates of amount and cultivated mulberry. The results are as follows. (1) The Mulberry grows best on the soil which contains good supply of lime and react slightly acidic. (2) The chemical composition of mulberry leaves is effected on the soil reaction and best on the soil which react slightly acidic.

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The natures of alkali spot, its surrounding land, and the influences of alkali salts on sugar cane plant were investigated. The results will be summarized as follows;- (1) The alkali spot is usually situated below its surrounding land, and the former is richer in clay fractions near the surface horizon than the later. From these reasons, the origin of the alkali spot is geneally due to seepage. (2) In general we have a good vegetation of sugar cane plant in proportion to the distances from the alkali spot. (3) The horizontal distributions of water soluble solids and Cl' of these soils are definitively eliminated according to these vegetations, but SO_3'', HCO_3' and pH are diverse. (4) The influences of soluble solids and Cl' in soils on sugar cane plant will be generally summarized as follows; [table] (5) Brix, sucrose and aopparent purity of juices obtained from the violent damaged plants are lower and reducing sugar content of the juices is slightly higher than those of the juices obtained from the slightly damaged plants. (6) The stalks of the violent damaged plants contain a great amount of total N, total ash, CaO, MgO, K_2O, Na_2O, SO_3 and Cl, but the quantities of Fe_2O_3 + Al_2O_3,Mn_3O_4 and P_2O_5 (these substances decrease in ash %) are indifferent (7) CaO : MgO : K_2O : Na_2O; the mean ratio of the absorbed substances for the extents of damaged stalks is 2.28 : 4.74 : 54.50 : 38.48 and SO_3 : Cl is 57.22 : 42.78. These ratios are indifferent for the extents of damage in these experiments. (8) In views of the results mentioned above, it is seemed that the influences of alkali salts are not due to the ratios of the absorbed substances, but generally due to the concentrations of the soil solutions and absorbed solts in stalks.

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