污灌水中的铁对土壤性质和水稻生长的影响

以污灌水形式带入农田的铁对水稻影响的研究报道尚少。本文通过水稻盆栽试验,研究不同浓度的含铁污水对土壤pH值、水溶性及交换性亚铁含量和水稻植株含铁量、生长状况及产量的影响。结果表明,在两造的时间内,当污灌水含铁1000ppm以上时减产显著,污灌水含铁600～800ppm时有减产的趋势,污灌水含铁600ppm以下时对产量没有显著影响。水稻亚铁中毒时从老叶叶鞘中部开始发病。晚造糙米含铁量为早造的4～9倍。

THE EFFECTS OF IRON IN THE SEWAGE IRRIGATION WATER ON SOIL PROPERTIES AND RICE GROWTH

The effects of iron in the sewage irrigation water flowing into the field on rice growth have been scarcely reported. This pot culture experiment aims at the effects of the sewage water with different concentration of iron on the soil pH, the contents of soluble and exchangable ferrous iron, the iron contents of the plant,the rice growth and yield. During two crops,it was found that the yield was remarkably reduced when the iron content in the sewage water was more than 1000 ppm; there was a tendancy of yield reduction when the iron content was between 600 and 800 ppm; no remarkable effects were observed when the iron contene was less than 600ppm;when the rice suffered from ferrous iron torxcity, disease occured at the middle part of the older leaf sheath. The iron content in the brown rice in the second crop was 4 to 9 times as that in the first crop.