2024-03-28T10:59:13Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02006628
2022-02-15T03:32:40Z
1642837622505:1642837931845:1642837932661
1642838403551:1642838407312
琉球産土壤の微量要素に関する研究 1. Spurway Soil Test Kit による予備試験 1. 石垣島土壌(追補)
Study on minor elements of Ryukyuan soils. 1. Preliminay test by Spurway Soil Test Kit. 1. Soils from Ishigaki Islands (supplement)
鎮西, 忠茂
Chinzei, Tadashige
1. As a supplement of the previous report, soil samples from 10 locations in Ishigaki Island were tested by Spurway Soil Test Kit for the purpose stated in the previous report. 2. All of the soil samples contained 3 to 6 p.p.m. of magnesium. 3. Soil samples in four locations gave low reserve test results for iron which indicate the possibility of iron deficiency for crops. The upper horizons have a tendency to show a low content in iron. This suggests that in the early stages of growing plants, an iron deficiency may be found. 4. Samples from five locations gave low active test results in manganese which indicate the possibility of mangaese deficiency. 5. Test results for sulfates were negative in all soil samples. However, soils may not be deficient in sulfur because the lower limit of the sulfate test of the Spurway Soil Test Kit is 20 p.p.m. 6. In addition to the tests on above elements, the following tests of elements were made: a) Most soil samples showed low test results for available nitrogen. b) All soils except one were also low in phosphorus content which indicate the need for heavy phosphorue fertilization. One sample gave a high test result. It is supposed that the fixed phoshorus resulting from past phosphorus fertilizer applications might have caused such a high test result. c) Generally, most soil samples gave high reseve test results in potassium. However, these same samples gave negative test results for active potassium. Therefore, short period crops or crops which have weak absorption power of potassium may need soluble potassium fertilizers. d) Aluminum, chlorides and nitrites were all below toxic levels. 7. Other elements besides the above were not examined because the Spurway Soil Test Kit does not include such testing methods.
紀要論文
http://purl.org/coar/resource_type/c_6501
琉球大学農家政学部
NA
http://hdl.handle.net/20.500.12000/21950
0370-4238
AN0025056X
琉球大学農家政学部学術報告
Science bulletin of Agriculture & Home Economics Division, University of the Ryukyus
3
146
139
jpn
open access