報告書番号

485008

タイトル（和文）

石炭灰埋立地の畑地化に関する研究（第３報）海成砂土及び強酸性褐色森林土壌への石炭灰の混合がキャベツ，ラッキョウの生育，無機成分吸収，土壌の化学性に及ぼす影響

タイトル（英文）

STUDY ON THE USE OF COAL ASH RECLAIMED LAND AS A UPLAND-FIELDS (PART 3). GROWTH AND MINERAL NUTRITION OF CABBAGE AND SCALLION IN FLY ASH TREATED ACID BROWN FOREST SOIL AND SAND.

概要 （図表や脚注は「報告書全文」に掲載しております）

石炭灰の理化学性に着目し，わが国の代表的土壌（海成砂土，褐色森林土壌）に石炭灰（フライアッシュ，以下ＦＡ）を混合し，キャベツ，ラッキョウを栽培し，土壌改良効果を検討した。ＦＡ混合海成砂土において，混合量が増す程ラッキョウの生育は低下した。しかしキャベツを用いて経年変化を検討したところ，第１作では２０％の混合では生育低下したが，０．５％，１％では増収となり，第２作，第３作では０．５～２０％のＦＡ混合区は全て対象区を上回る生育を示し，特に１０％の収量が優れた。褐色森林土壌への１～５０％のＦＡ配合は全てキャベツの生育を促し，特に５～２０％の混合は著しく収量を高めた。これらの要因としては，ＦＡ混合による土壌ｐＨの調整，ホウ素，モリブデンの吸収促進などが考えられた。ＦＡの適正混合量は土壌の種類により異なり，陽イオン交換容量の低い土壌は低濃度混合が望ましく，高い土壌は，高濃度混合が可能である。

概要 （英文）

THIS STUDY AIMS TO PROMOTE THE UTILIZATION OF FLY ASH FROM COAL-FIRED POWER PLANT AS SOIL AMENDMENT INPUT. ACID BROWN FOREST SOIL WAS MIXED WITH FLY ASH AT 0,1,10,20,30,AND 50% BY VOLUME,AND SAND WAS MIXED WITH FLY ASH AT 0,0.5,1,5,10,AND 20% BY VOLUME. GROWTH AND MINERAL ABSORPTION IN CABBAGE AND SCALLION CROPPED IN THE ABOVEFLY ASH MIXING SOIL WERE INVESTIGATED. THE GROWTH AND YIELD OF SCALLION DECREASED IN FLY-ASH MIXED SAND. THE EFFECT OF FLY ASH MIXING SAND GRADUALLY CHANGED DURING THREE REPEATED CROPPING OF CABBAGE. IN THE FIRSTCROPPING,CABBAGE GROWTH WERE PROMOTED IN 0.5 AND 1% MIXING SOILS,WHILEIT WAS INHIBITED IN 20% MIXED SOIL COMPARED WITH CONTROL. IN THE SECOND AND THIRD CROPPINGS,ALMOST IN EVERY CASE GROWTH PROMOTING EFFECT WAS OBSERVED,ESPECIALLY IN THE CASE OF 5,AND 10% MIXING THE CABBAGE YIELD INCREASED SIGNIFICANTLY. FLY ASH MIXING BROWN FOREST SOIL SHOWED A SAME TENDENCY IN THE THREE (TIMES) CROPPINGS OF CABBAGE. THE GROWTH AND YIELD OF CABBAGE WERE ACCELERATED BY FLY ASH MIXING,ESPECIALLY IN THE CASE OF 5,10,AND 20% MIXING THE YIELD INCREASED SIGNIFICANTLY. BORON AND MOLYBDENUM CONTENT IN PLANT REMARKABLY INCREASED WITH FLY ASH TREATMENT. INCREAES IN GROWTH AND YIELD OF CABBAGE SEEMED TO BE DUE TO INCREASES INPH,BORON AND MOLYBDENUM ABSORPTION BY FLY ASH TREATMENT. IN UTILIZATION OF FLY ASH AS SOIL AMENDMENT INPUT,THE SUITABLE RATE OF MIXING DEPENDS ON SOIL TYPE USED. THERFORE,WE MAY SUGGEAST THAT LOW RATE MIXING MAY BE SUITABLE FOR THE SOIL WITH SMALL CATION EXCANGE CAPACITY,WHILE HIGHER RATE MIXING MAY BE POSSIBLE IN THE SOIL WITH LARGE CATION EXCHANGE CAPACITY.

報告者

キーワード