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中毒性僵苗就是稻田土壤中亚铁及硫化氢等还原性物质所造成的僵苗。稻田耕层土色愈蓝说明亚铁含量愈多,毒性愈大;拔出稻苗根系臭鸡蛋味越浓,表明土中硫化氢浓度愈高。 实践表明,稻田亚铁含量过多,水稻根系活力减弱,成为纤细的“棉絮根”。植株矮小,植株下部叶片出现褐色斑点,即通常所谓的“麻斑叶”。危害严重时,根系老化,常附有锈膜或锈斑;叶片发黑,枯垂下卷,以至死株。
Toxic poisoning is paddy soil ferrous and hydrogen sulfide and other reducing substances caused by stiff seedlings. The color of cultivated soil in the paddy field shows that the more the ferrous content is, the greater the toxicity is. The stronger the egg smell is, the higher the concentration of hydrogen sulfide in the soil is. Practice shows that rice paddy ferrous content is too much rice weakened root activity, a slim “cotton root.” Short plants, brown spots appear on the lower leaves of the plant, the so-called “leaf spot”. Serious damage, root aging, often accompanied by rust film or rust; leaves black, withered volumes, and even die.