Volume 5,Issue 4,1957 Table of Contents
1957, 5(4):271-284.
Abstract:
(I) About 4180 years ago, when Yu(禹) was appointed by Emperors Yao(尧) & Chun(舜) to remedy the inundations of large rivers by which much of the country was desolated. These occasionally rose to such a height in some narratives they are represented as a flood overspreading the whole land. He had been able to solve the wide-spreading flood effectively with his stuff through a period of 13 years continuously hard working. During the long period of travelling all over the country in many directions, he had studied the soil conditions and crop productions in the nine regions, into which the land was then divided, namely,(1)Chi(冀),(2) Yin(兗),(3) Ching(青),(4) Shu(徐),(5) Young(杨),(6) Gin (荆), (7) Yu(豫),(8) Liang(梁),and (9) Yung(雍).He classified different soils principally according to their colors, characteristics and fertility. His system of clas-sification may be summarised in the following tabie 1.
(I) About 4180 years ago, when Yu(禹) was appointed by Emperors Yao(尧) & Chun(舜) to remedy the inundations of large rivers by which much of the country was desolated. These occasionally rose to such a height in some narratives they are represented as a flood overspreading the whole land. He had been able to solve the wide-spreading flood effectively with his stuff through a period of 13 years continuously hard working. During the long period of travelling all over the country in many directions, he had studied the soil conditions and crop productions in the nine regions, into which the land was then divided, namely,(1)Chi(冀),(2) Yin(兗),(3) Ching(青),(4) Shu(徐),(5) Young(杨),(6) Gin (荆), (7) Yu(豫),(8) Liang(梁),and (9) Yung(雍).He classified different soils principally according to their colors, characteristics and fertility. His system of clas-sification may be summarised in the following tabie 1.
1957, 5(4):285-291.
Abstract:
For the reconstruction and amelioration of the Yellow River Valley, a great extent of soil survey and soil research, especially on the North China Great Plain were carried out. The present paper deals with the general description of the region, the great soil groups, general characteristics of soils and their amelioration. The more detailed results will be further mentioned in the next manuscript.
For the reconstruction and amelioration of the Yellow River Valley, a great extent of soil survey and soil research, especially on the North China Great Plain were carried out. The present paper deals with the general description of the region, the great soil groups, general characteristics of soils and their amelioration. The more detailed results will be further mentioned in the next manuscript.
1957, 5(4):292-304.
Abstract:
For the study of the influence of oxidation-reduction conditions of the soil on the growth of rice plant, pot experiments with three paddy soils were conducted. The used soils included an acid paddy soil derived from quartiary red clay, an acid mountain paddy soil derived from granite and a neutral alluvial paddy soil.
For the study of the influence of oxidation-reduction conditions of the soil on the growth of rice plant, pot experiments with three paddy soils were conducted. The used soils included an acid paddy soil derived from quartiary red clay, an acid mountain paddy soil derived from granite and a neutral alluvial paddy soil.
1957, 5(4):305-316.
Abstract:
1. Из данных опытов наблюдали что, растворимые фосфаты после внесения в краснозем быстро превращаются в формы уосфатов железа и алюминия.
1. Из данных опытов наблюдали что, растворимые фосфаты после внесения в краснозем быстро превращаются в формы уосфатов железа и алюминия.
1957, 5(4):317-321.
Abstract:
When alkali soil is leached with water, the amount of calcium in water extracts is always less than in the case of normal soil. With increased dilution there is a definite increase in the amount of calcium given out, yet the quantity is not very great. When water is added in increasing amounts to the normal soil, there is no increase in pH values of the successive filtrates and the pH of the distilled water is easily obtained, whilst the pH value of the alkali soils falls very gradually to a pH of 7.6. The amount -CO3 ions in the extracts gradually decreases with concomitant decrease in pH values. The amount of bicarbonates at first increases gradually and then falls. A gradual decrease in pH values also takes place with repeated washings with distilled water.
When alkali soil is leached with water, the amount of calcium in water extracts is always less than in the case of normal soil. With increased dilution there is a definite increase in the amount of calcium given out, yet the quantity is not very great. When water is added in increasing amounts to the normal soil, there is no increase in pH values of the successive filtrates and the pH of the distilled water is easily obtained, whilst the pH value of the alkali soils falls very gradually to a pH of 7.6. The amount -CO3 ions in the extracts gradually decreases with concomitant decrease in pH values. The amount of bicarbonates at first increases gradually and then falls. A gradual decrease in pH values also takes place with repeated washings with distilled water.
1957, 5(4):322-330.
Abstract:
The scientific application of an ideal rotation system on paddy fields, has now been considered as a very important problem for ensuring higher grain yields and promoting soil fertility. As the commencing work on rotation researches, authors had selected to study the Rice-Cotton, rotation system in Yuyao, Chekiang Province. A series of investigations and experiments were conducted in the year of 1955, in order to realize the variations of soil chemical properties and rice growth on those rotated paddy fields. The results obtained are summerized as follows.
The scientific application of an ideal rotation system on paddy fields, has now been considered as a very important problem for ensuring higher grain yields and promoting soil fertility. As the commencing work on rotation researches, authors had selected to study the Rice-Cotton, rotation system in Yuyao, Chekiang Province. A series of investigations and experiments were conducted in the year of 1955, in order to realize the variations of soil chemical properties and rice growth on those rotated paddy fields. The results obtained are summerized as follows.
1957, 5(4):331-344.
Abstract:
In present experiment the desorption of adsorbed ammonium by soils and clay minerals from ammonium chloride and ammonium acetate solutions of various concentrations and at different pH values were studied in detail. The samples used include a lateritic red soil (SiO2/R2O3 of clay 1.05), a red soil (SiO2/R203 1.63), a podsolized yellow soil (SiO2/R203 1.59), a betonitic clay and a kaolinitic clay.
In present experiment the desorption of adsorbed ammonium by soils and clay minerals from ammonium chloride and ammonium acetate solutions of various concentrations and at different pH values were studied in detail. The samples used include a lateritic red soil (SiO2/R2O3 of clay 1.05), a red soil (SiO2/R203 1.63), a podsolized yellow soil (SiO2/R203 1.59), a betonitic clay and a kaolinitic clay.
