報告書番号

480003

タイトル（和文）

ジャガイモの生育・収量におよぼすけい酸加里肥料の肥効－とくに残効性について

タイトル（英文）

EFFECTS OF POTASSIUM SILICATO FERTILIZER ON THE GROWTH AND YIELD OF PATATOES

概要 （図表や脚注は「報告書全文」に掲載しております）

けい酸加里肥料は水に難溶でクエン酸にとけるく溶性加里やけい酸を主成分とする肥料であり，従来の水溶性加里肥料とはその性質を異にする。けい酸加里肥料は水溶性加里である塩化加里に比べてかん水による溶脱が少なくその残効性が期待される。本研究は前２作（サツマイモ，レタス）を塩化加里とけい酸加里で栽培した跡地に加里無施用条件でジャガイモを栽培し，けい酸加里肥料の残効性を検討したものである。結果の概要は次のとおりである。ジャガイモの生育・収量はけい酸加里区ですぐれ，塩化加里に比べて明らかな差異が認められた。ジャガイモの加里吸収量はけい酸加里区が塩化加里区より著しく高かった。つまりく溶性と水溶性加里の差が顕著であった。

概要 （英文）

THE MAIN CONSTITUENTS OF POTASSIUM SILICATE FERTILIZER ARE POTASSIUM OXIDE AND SILICON DIOXIDE AND THEY ARE SOLUBLEIN 2% CITRIC ACID BUT INSOLUBLE IN WATER.AS POTASSIUM SILICATE IS LESSSOLUBLE FROM SOIL THAN POTASSIUM CHLORID,IT HAS A DIFFERENT NATURE AS A FERTILIZER. THIS STUDY WAS CARRIED OUT TO ABSERVE THE DIFFERENCES IN PERFORMANCE OF TWO FORMS OF POTASSIUM FERTILIZER.FOUR SETS OF PLOTS CONTAINING LOCAL CLAY SOIL WERE TREATED WITH NO POTASSIUM FERTILIZER,WITH A STANDARD DOSE OF POTASSIUM CHLORIDE FERTILIZER,WITH A STANDARD DOSE OF POTASSIUM SILICATE FERTILIZER,AND THREE TIMES THE STANDARD DOSE OF POTASSIUM SILICATE FERTILIZER,ALL PLOTS ALSO RECEIVED APPLICATION OF NITRATE AND PHOSPHATE FERTILIZER.SWEET POTATOES WERE PLANTED IN THE PLOTS.AFTER THE SWEET POTATOES WERE HARVESTED THE TREATMENTS WERE REPEATED ANDA CROP OF LETTUCE WAS PLANTED IN THE PLOTS.AFTER HARVEST OF THE LETTUCE CROP,NITROGEN AND PHOSPHORUS FERTILIZERS WERE APPLIED BUT NO POTASSIUM FERTILIZER.POTATOES WERE PLANTED IN THE PLOTS.THE RESULTS WERE AS FOLLOWS: GROWTH AND YIELD OF POTATOES IN PLOTS TREATED WITH POTASSIUM SILICATE WERE HIGHER THAN IN PLOTS TREATED WITH POTASSIUM CHLORIDE OR NO POTASSIUM FERTILIZER. ABSORPTION OF POTASSIUM OXIDE BY POTATO PLANTS IN PLOTS TREATED WITH POTASSIUM SILICATE WERE HIGHER THAN IN PLOTS RECEIVING KCL OR NO POTASSIUM.

報告者

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