火山灰土における燐肥の肥効増進に関する研究 : 第1報 土壤と燐酸の混合割合並に燐肥の施用法について   :   Studies on the Improvement of the Manuring Effect of Phosphatic Fertilizers in Volcanic Ash Soils : 1. The Mixed Rate of Soil to Phosphorus and the Placement of Phosphatic Fertilizer. 

作成者 吉江, 修司, 嶋田, 永生
作成者 (ヨミ) ヨシエ, シュウジ
作成者の別表記 YOSHIE, Shuji, SHIMADA, Nagao
日本十進分類法 (NDC) 613.4
内容 1)火山灰土を用い, 土壌と燐酸の混合割合が有効態燐酸の変化並に憐酸の肥効に及ぼす影響について試験し, 併せて燐酸の施用法と肥効との関係についても試験した.2)土壌と燐酸の混合割合は土壌の燐酸吸収係数を基にして, 混合する土壌を増減した.3)有効態の燐酸は土壌の混合量を増加するに従つて減少したが, 特に燐酸吸収係数当量混合より土壌量を増加した場合に著しかつた.4)燐酸一石灰では, 土の混合割合が少い場合には土壌の燐酸吸収力より過剰の燐酸は水溶性のまゝ保持され, 而も水で洗つても移動は除々であつた.5)土壌との混合による有効態燐酸の減少率はトーマス燐肥及び熔成燐肥の方が燐酸一石灰よりやや低かつた.6)栽培試験は結球白菜, かんらん, ほうれん草, かぶら, だいこん等を用いて行つた.何れの作物も燐酸吸収係数当量混合の場合が, これより土の混合量を多くした場合, 少くした場合或は無混合の場合に比らべ収量, 燐酸の吸収量共に多かつた.7)燐肥の施用位置は播種の場合には, 種子の下5cmの深さ, 苗の場合には根の下5cm内外が, 最も肥効が高く, とれより深肥も側面施用も低かつた.8)燐肥は根又は種の下に広く施用する方が局所にかためて用いるより肥効が高かつた.本研究は文部省科学研究費の助成を受けて行つたものである.昭和25年及び27年に「火山灰土に於ける燐肥の肥効増進に関する研究 第1報, 第3報」と題し日本土壌肥料学会講演会で発表したものてある.
1) Influences of mixed rate of soil to phosphorus upon the change of available phosphorus and manuring effect of phosphatic fertilizer were studied in volcanic ash soils. And the relation of the placement of phosphatic fertilizer to its man ring effect was also experimented. 2) With mixed rate between soil and phosphorus, the soil quantity was increased or decreased on the basis of phosphorous absorptive coefficient of the soil. 3) Available phosphorus was decreased in proportion as mixed quantity of soil increased but specially it was remarkable, when mixed soil quantity was increased above the rate that corresponded to that absorptive coefficient. 4) In case of monocalcium-phosphate, when the mixed ratio of soil was less than the equivalent quantity of the above coefficient, the phosphorus that exceeded soil's absorptive capacity was maintained in the water soluble state and removed slowly even by washing with water. 5) Decreased percentage of available phosphorus caused by the mixing with soil was somewhat lower in case of Thomas-slag and Fused-phosphate than that of monocalcium-phosphate. 6) In cultivation tests, Chinese cabbage, cabbage, spinach, turnip and radish were used. In all crops, both their yields and phosphorus uptake were larger in case of the mixed rate that corre ponded to the phosphorous absorptive coefficient of soil than the case of more soil, less or nothing was mixed. 7) In the placement of phosphatic fertilizer, where 5cm depth beneath the seeds in case of seedling and where some 5cm depth beneath the roots in case of seedling were the hi hest in manuring effects, and the deeper or side supply was low. 8) Phosphatic fertilizer showed more effective in broadcast beneath roots or seeds than in lumpy supply.

公開者 千葉大学園芸学部
コンテンツの種類 紀要論文 Departmental Bulletin Paper
DCMI資源タイプ text
ファイル形式 application/pdf
ISSN 0069-3227
NCID AN00142658
掲載誌情報 千葉大学園芸学部学術報告 Vol.3 page.55-66 (19560310)
情報源 The technical bulletin of Faculty of Horticulture, Chiba University
言語 日本語
著者版フラグ publisher

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