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Published Papers 【 display / non-display 】

• Effect of Soil Types and Phosphorus Fertilization on Growth and Nutrients Uptake by the Green Manure Plants <i>Sesbania </i>cannabina and <i>S. rostrata</i>

  Kitou Makoto

  Japanese Journal of Crop Science ( CROP SCIENCE SOCIETY OF JAPAN )  91 ( 1 ) 1 - 8   2022.01 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  <p>Sesbania cannabina and <i>S. rostrata</i> are grown as green manure crops in Okinawa, Japan. The former sets seeds early and poses a potential weed problem. The latter does not. We compared plant growth and nutrient uptake between the species. <i>S. rostrata</i> showed more vigorous growth in pots than <i>S. cannabina</i> in Kunigami Marji (red soil), Shimajiri Marji (dark red soil), and Andosol at 45 days after sowing. Both appeared to have low P tolerance, because P fertilization had little effect on their growth in Kunigami Marji. The Mg content was higher in <i>S. rostrata</i>, but other nutrient contents tended to be similar or slightly higher in <i>S. cannabina</i>. In the field, <i>S. rostrata</i> showed significantly more vigorous growth than <i>S. cannabina</i> at 87 days. The pods accounted for about 1/3 of the aboveground weight in <i>S. cannabina</i>. The total aboveground weight (including pods) was also large in <i>S. rostrata</i>. The P contents in the aboveground parts (including pods) were similar, but the N, K, Ca, and Mg contents were larger in <i>S. rostrata</i>. These results suggest that <i>S. rostrata</i> would be as effective as <i>S. cannabina</i> as a green manure crop.</p>

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• Effects of Various Types of Phosphorus Fertilizer on Growth, Yield, and Phosphorus Absorption Characteristics in Buckwheat

  Kitou Makoto, Yamashiro Miyo, Michiyama Hiroyasu

  Japanese Journal of Crop Science ( CROP SCIENCE SOCIETY OF JAPAN )  89 ( 2 ) 87 - 97   2020.04 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  <p>This study was conducted to clarify the characteristics of phosphorus absorption in buckwheat (<i>Fagopyrum esculentum </i>Moench) and to elucidate the reasons for low seed yield in Kunigami-maaji soil cultivation. Buckwheat growth and seed yield were drastically suppressed in the treatment with no phosphorus fertilizer. At harvest time, root dry weight in the low-phosphorus condition was larger than that in the high-phosphorus condition, as root growth was promoted or prolonged after the flowering stage, which seemed to lead to greater nutrient absorption in the low-phosphorus treatment. In addition, both the concentrations and uptakes of phosphorus in the leaves and stem decreased after the flowering stage, while the phosphorus concentration in seeds remained around 2.5 g/kg in the low-phosphorus condition. Thus, it appears that the phosphorus in leaves and stem is remobilized to the seeds after the flowering stage to keep the seed phosphorus concentration at that level. These two phosphorus-absorption characteristics of buckwheat seem to underlie the crop's tolerance of low phosphorus. Furthermore, our experiments also revealed that the decrease of growth and yield was severe when buckwheat was cultivated with Fe-bound phosphorus, whereas the decline was small with Al-bound phosphorus.</p>

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• Effects of Various Types of Phosphorus Fertilizer on Growth, Yield, and Phosphorus Absorption Characteristics in Buckwheat

  Makoto Kitou, Miyo Yamashiro, Hiroyasu Michiyama

  Japanese Journal of Crop Science   89 ( 2 ) 87 - 97   2020.02 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

• 赤玉土と赤色土（国頭マージ）を用いたラッカセイ，ダイズ，セスバニアの低リン耐性の比較ならびに菌根菌接種の影響

  鬼頭 誠

  日本作物学会紀事 ( 日本作物学会 )  88 ( 2 ) 108 - 116   2019

  Type of publication: Research paper (scientific journal)

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  <p>沖縄でのソバ前作物としての可能性を明らかにするために，施肥リンがAl型リンで固定される赤玉土とFe型リンで固定される赤色土（国頭マージ）を用いてラッカセイとダイズ，セスバニアの低リン耐性を比較した．また，3種マメ科植物に対する菌根菌の接種効果についても合わせて調査を行った．赤玉土へのリン施肥量の低下により3種マメ科植物の生育量は低下した．しかし，ラッカセイはダイズより低下度合が小さく，セスバニアよりリン無施肥区とリン酸吸収係数の0.1％相当量の少量施肥区で生育が高まっていた．なお，ラッカセイの根粒着生量はダイズと同程度であり，いずれのリン施肥区でもセスバニアより低下した．播種3週間後の生育初期時のダイズとセスバニアの根長はリン欠乏区で著しく低下したが，ラッカセイでは低下せず，種子中のリンを多く含むラッカセイではリン欠乏条件でも初期生育時の根系発達が確保できることが明らかになった．赤色土に菌根菌無接種で栽培したラッカセイはいずれの過リン酸石灰施肥区，リン酸アルミニウムやリン酸鉄施肥区とも地上部生育量，リン吸収量ともダイズと同程度であり，セスバニアより低下した．菌根菌の接種によりラッカセイは生育量とリン吸収量が高まり，セスバニアと同程度以上の上昇が認められ，特に難溶性リンの吸収量と地上部生育量はセスバニアより高まった．これらの結果から，ラッカセイは種子中のリン含有量が高く，初期生育時の根系発達により，低リン肥沃度土壌でリンを吸収する能力が高いが，その後の十分な生育を確保するためには菌根菌の感染が必要であると思われる．</p>

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• 沖縄のソバ栽培地に分布する国頭マージ，島尻マージおよび黒ボク土でのソバの生育および収量の比較

  山城 美代, 鬼頭 誠, 道山 弘康

  日本作物学会紀事 ( 日本作物学会 )  88 ( 3 ) 161 - 167   2019

  Type of publication: Research paper (scientific journal)

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  <p>近年，沖縄島北部と宮古島でソバ栽培が始まっている．両地域にはそれぞれ酸性の国頭マージ（赤色土）と概ね中性の島尻マージ（暗赤色土）が分布している．これら土壌は日本のソバ栽培地の多くに分布する黒ボク土とは土壌有機物量やリンの存在形態など，土壌の理化学性に大きな違いがある．本試験では，国頭マージと島尻マージおよび黒ボク土を用いてソバを栽培し，生育量，収量および各種養分吸収量を比較した．ソバの生育量と収量は黒ボク土に比べて島尻マージより国頭マージで低下し，側枝花房数の減少と結実率の低下が主因と考えられた．窒素含有率は茎と子実において国頭マージで低かった．リン含有率は子実では国頭マージが黒ボク土よりわずかに低かったが，茎では有意に高かった．カリウム含有率は全ての器官で黒ボク土が著しく高く，国頭マージ，島尻マージの順に有意に低下していた．施肥を行っていないカルシウム含有率は子実では土壌間に顕著な違いがなかったが，茎では土壌の交換性カルシウム含有率を反映して国頭マージは黒ボク土と同程度であり，島尻マージでは高かった．マグネシウム含有率は全ての器官とも黒ボク土で最も低く，島尻マージ，国頭マージの順に高くなった．子実重，茎重，側枝花房数は土壌の窒素含有率とAl型リン含有率と高い正の相関が認められたが，Fe型リンや可給態リンとは有意な相関がなく，施肥リンがFe型で固定される沖縄の土壌とは異なり， Al型で固定される黒ボク土ではリン吸収が高まることで生育量と収量が増加したと考えられる．</p>

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Presentations 【 display / non-display 】

• Effects of additional N fertilizer and slow release N fertilizer on the Growth and Yield of Buckwheat

  Kitou Makoto

  Abstracts of Meeting of the CSSJ  2022.09  -  2022.09 

  CiNii Research

• Possibility of reduced fertilizer cultivation by groundnut and buckwheat planting system at Shimajiri Marge in Okinawa

  Kawabata Mei, Kitou Makoto

  Abstracts of Meeting of the CSSJ  2022.09  -  2022.09 

  CiNii Research

• Effect of phosphorus fertilizer application on the growth and yield of buckwheat in Andosols with different phosphorus fertility

  Makoto Kitou, Hinako Iwashita, Takahiro Hara

  Abstracts of Meeting of the CSSJ  2022.03  -  2022.03 

  CiNii Research

• Effect of phosphorus fertilization on groundnut growth and yield at Kunigami Marge

  Kitou Makoto, Kawabata Mei

  Abstracts of Meeting of the CSSJ  2021.09  -  2021.09 

  CiNii Research

• Growth, yield and phosphorus uptake of buckwheat cultivated in acrisols (kunigami maaji) with different phosphorus fertility

  Kitou Makoto

  Abstracts of Meeting of the CSSJ  2020.09  -  2020.09 

  CiNii Research

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Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2014.04  -  2017.03 

  Direct: 4,000,000 (YEN)  Overheads: 1,200,000 (YEN)  Total: 5,200,000 (YEN)

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2005  -  2008 

  Direct: 2,500,000 (YEN)  Total: 2,500,000 (YEN)