Plant treatment compositions comprising metal alginate salts and further containing at least one amine compound (sometimes also herein referred to as the "first amine compound"), and additionally includes at least a pH buffer composition comprising a second amine compound (sometimes also herein referred to as the "second amine compound"), which compositions useful in the treatment of plants, particularly food crops. In certain embodiments, the plant treatment compositions are highly effective even wherein the content of metallic copper present is 500 ppm or even less in the plant treatment composition used to treat plants or crops. The plant treatment compositions are found to be highly effective even in the absence of herbicides, fungicides and pesticides.金属アルギン酸塩を含み、少なくとも１つのアミン化合物（本明細書では「第１のアミン化合物」とも呼ぶ）をさらに含み、第２のアミン化合物を含む少なくともｐＨ緩衝組成物（本明細書では「第２のアミン化合物」とも呼ぶ）をさらに含み、植物、特に食用作物の処理に有用である植物処理組成物。特定の実施形態において、存在する金属銅の含量が、植物又は作物を処理するために用いる植物処理組成物中５００ｐｐｍ以下である場合でさえ、植物処理組成物が高度に有効である。植物処理組成物は、除草剤、殺菌剤及び殺虫剤が存在しない場合でさえも高度に有効であることが認められる。
