Japanese Journal of Tropical Agriculture

Online ISSN : 2185-0259
Print ISSN : 0021-5260
ISSN-L : 0021-5260

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Volume 28, Issue 4

Displaying 1-14 of 14 articles from this issue

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Fertilization Management of Okinawan Soils for the Cultivation of Forage Crops

I. Response of Sudangrass (Sorghum vulgare var. sudanese) to Potassium Application

Kazuhiro OYA, Naoki NAKAISHI

1984 Volume 28 Issue 4 Pages 211-217
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.211

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Potassium applications ranging from 0 to 200 ppm K did not have favorable effect on the dry matter yields of Sudangrass in any of the soils from four soil groups tested with pot experiments. The contents and uptake of potassium increased in the grass on most of the soils with the increase in the rate of potassium application. The release of potassium was much higher in the soils belonging to the Gray Upland soil group and lower in the soils belonging to the Red, Dark Red, and Yellow soil groups. It is suggested that potassium fertilization is less important for the soils of the Gray Upland soil group but is useful for the other soils.

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Soil Fertility in a Shifting Cultivation on Iriomote Island of Okinawa

1. Nutrients Stored in the Forest and Their Input to the Soil

Kazuhiro OYA, Yoshihiro TOKASHIKI

1984 Volume 28 Issue 4 Pages 218-223
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.218

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It was estimated that90.6, 0.6, 0.1, 0.5, 0.8, 0.2, and 0.5 tons of C, N, P₂O₅, K₂O, CaO, MgO, and Na₂O were stored per hectare, respectively, in the above-ground forest biomass at the shifting cultivation experiment site on Iriomote Island of the Ryukyus. The pH, exchangeable Ca, K, and Na, and base saturation of the soil were increased by burning the forest biomass, whereas decreased were the total C, C/N ratio and CEC. The estimated amounts of nutrients added to the soil were in the following order : K₂O>CaO>Na₂O>MgO>P₂O₅. It was, however, considered much inputs could not be expected on this particular site.

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Influence of Time of Sowing on the Grain Productivity of Mungbean (Raipur loc. var., India)

Bui Chi TRUNG, Shigekata YOSHIDA

1984 Volume 28 Issue 4 Pages 224-229
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.224

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To investigate the influence of different sowing dates on the grain productivity, mungbean plants were sown on six different dates and grown successively in pots at Nagoya University Farm. The necessity period from sowing to flowering was consistently shortened wilt the late sowings while the grain yield, grain production rate and the efficiencies of grain and grain protein production were markedly high in the May 15 sowing. However, the crude protein content in grain was higher at the later sowings. From these results, it was recognized that the most suitable sowing time for mungbean under similar climatic conditions as Nagoya was about the middle of May in regard to the grain productivity and also to the high utilization of arable land.

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[title in Japanese]

[in Japanese]

1984 Volume 28 Issue 4 Pages 230-236
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.230

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[in Japanese]

1984 Volume 28 Issue 4 Pages 237-242
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.237

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[title in Japanese]

[in Japanese]

1984 Volume 28 Issue 4 Pages 243-245
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.243

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[title in Japanese]

[in Japanese]

1984 Volume 28 Issue 4 Pages 246-248
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.246

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[title in Japanese]

1984 Volume 28 Issue 4 Pages 248-252
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.248

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[title in Japanese]

[in Japanese]

1984 Volume 28 Issue 4 Pages 253-259
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.253

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[title in Japanese]

[in Japanese]

1984 Volume 28 Issue 4 Pages 259-263
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.259

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[title in Japanese]

[in Japanese]

1984 Volume 28 Issue 4 Pages 263-268
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.263

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[title in Japanese]

[in Japanese]

1984 Volume 28 Issue 4 Pages 268-274
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.268

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[title in Japanese]

1984 Volume 28 Issue 4 Pages 274-280
Published: December 01, 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.274

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ERRATUM

1984 Volume 28 Issue 4 Pages 283
Published: 1984
Released on J-STAGE: March 19, 2010

DOIhttps://doi.org/10.11248/jsta1957.28.4_283

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