缺磷缩苗一般在缓秧后的分蘖期发生,表现为生长缓慢、植株矮小,叶形细长,叶色暗绿,叶簇顶端整齐,叶枕距显著缩短,部分蘖叶尖发红,老叶呈棕红色甚至死亡。造成的原因:一是土壤缺乏速效磷;二是土温、水温低,或土壤中含硫化氢、亚铁等还原性有害物质,使根的吸收能力降低; Phosphorus deficiency reduced seedling usually occurs after tillering stage, showing slow growth, short plants, leaf shape slender, dark green leaves, leaves the top of the tidy, significantly shortened from the leaf pillow, part of the tiller tip redness, Old leaves were brown and even died. Cause: First, the lack of available phosphorus soil; Second, soil temperature, water temperature is low, or soil containing hydrogen sulfide, ferrous and other reducing substances to reduce the absorption capacity of the roots;