報告書番号

U91040

タイトル（和文）

石炭灰混合土壌におけるチャ，ミカンおよび野菜の生育と元素含有量

タイトル（英文）

GROWTH AND MINERAL COMPOSITION OF TEA,SATSUMA MANDARIN AND VEGETABLES GROWN IN FLY-ASH AMENDED SOIL

概要 （図表や脚注は「報告書全文」に掲載しております）

ホウ素含有量が１４０ｍｕｇｇ－１の石炭灰を混合した土壌でチャ，ミカンと４種類の野菜を栽培し，生育と元素含有量について検討した。（１）石炭灰混合率がある率以上に増加すると，葉緑の黄化・壊死，あるいは落葉等の可視害が観察され，これらの症状が発現する石炭灰混合率は種によって異なった。（２）石炭灰混合率が増加すると，葉中のホウ素含有量が顕著に増加したが，ほう素以外の元素含有量には顕著な変化はみられなかった。このため，石炭灰混合率が増加した場合観察される可視害は，ほう素過剰症と考えられた。（３）チャ，ミカンとエダマメはホウ素に対し感受性で，ホウレンソウとキャベツは耐性であった。ダイコンはこれらの中間であると考えられた。（４）石炭灰を栽培土壌に混合利用する場合には，作物のホウ素過剰症に対する感受性の程度と使用する石炭灰のホウ素含有量を考慮して混合量を決定する必要があると考えられた。

概要 （英文）

TEA,SATSUMA MANDARIN,SOYBEAN,SPINACH,JAPANESE REDISH,AND CABBAGE WERE GROWN IN SOIL AMENDED WITH FLY ASH AT RATES RANGING UP TO 30% BY WEIGTH. (1)PLANTS DEVELOPED MARGINAL CHLOROSIS,NECROSIS,CURLING OR DEFOLIATION WITH INCREASING RATES OF FLY-ASH APPLICATION TO THE SOIL. HIGH APPLICATION RATES ENHANCED THE SEVERITY OF THESE SYMPTOMS. HOWEVER,THE CRITICAL APPLICATION RATES WERE DIFFERENT BETWEEN SPECIES. (2)PLANT-GROWTH REDUCTION WAS OBSERVED AT A FLY-ASH APPLICATIONRATE OF GREATER THAN 1% FOR TEA,AND 2% FOR SATSUMA MANDARIN AND SOYBEAN. JAPANESE RADISH GROWTH DECREASED AT AN APPLICATION RATE GREATER THAN20%. HOWEVER,SPINACH INCREASED GROWTH WITH INCREASING FLY-ASH APPLICATION RATES UPTO 30%. THE YIELD OF CABBAGE HEADS WAS BEST AT A 20% APPLICATION RATE. (3)PLANT-ANALYSIS DATA FOR K,CA,MG,NA,P,MN,FE,ZN,CU,B,MO,AL,CD,CR,SR,V,SHOWED SIGNIFICANT ACCUMULATION OF B WITH INCREASING RATES OF FLY-ASH APPLICATION. LEAF BMU G/G CONTENTS WHEN VISIBLE SYMPTOMS DEVELOPED IN MATURE LEAVES EXCEEDED 90-100 IN TEA,180-200 IN SATSUMA MANDARIN,170 IN SOYBEAN AND JAPANESE REDISH,110 IN SPINACH,AND 90 IN CABBAGE. (4)THE EDIBLE PARTS OF THESE PLANTS DID NOT ACCUMULATE ANY HEAVY METALS UP TO ABNORMAL LEVELS,WHEN PLANTS SHOWED NEITHER GROWTH INHIBITION NOR EXCESS B SYMPTOMS. (5)DEVELOPMENT OF EXCESS B INJURY IN PLANTS WAS ASSOCIATED WITH INCREASED OF FLY-ASH APPLICATION RATES. IF SOIL AMENDMENT WITH FLY ASH IS PLANNED TO NEUTRALIZE SOIL ACIDITY FOR CROPS SUCH AS SPINACH HIGH AMOUNTS OF FLY ASH WILL BE APPLIED TO FIELDS. SUCH A HIGH APPLICATION RATE MAY INDUCE EXCESS B IN B-SENSITIVE CROPS. IN FLY-ASH APPLICATION TO CROP FIELDS,CROP SENSITIVITY TO EXCESS B AND/OR CROP ROTATION WITH B-TOLERANT PLANTS SHOULD BE CONSIDERED.

報告者

キーワード