施用钢渣粉对水稻生长与产量及重金属含量的影响

2014—2015年,分别以中嘉早17和五丰优T025为早、晚季试验材料,通过田间定位试验,在氮、磷、钾养分施用量相同的条件下,研究不同用量(0、450、750 kg/hm~2)钢渣粉对双季水稻生长、产量及重金属含量的影响。结果表明:与单施化肥相比,增施钢渣粉有利于促进水稻根系生长,提高水稻生育后期根系活力和产量,根系干质量增幅为10.1%~25.8%,根系活力的增幅为14.3%~29.4%,产量的增幅为4.6%~6.2%;同时还能提高土壤pH值和有效氮、磷、钾、硅养分含量以及阳离子交换量(CEC),平均增幅分别为2.4%、3.7%、6.6%、2.1%、11.1%、5.4%;对土壤和稻米中重金属Hg、Cd、Pb、As、Cr、Mn的含量影响较小。

Effects of steel slag powder application on rice growth and yield and heavy metals content

Zhongjiazao 17 and wufengyou T025 were used as experimental materials, three levels of steel slag power(0, 450, 750 kg/hm2) with equal application of nitrogen, phosphorus and potassium were designed to study the effects of steel slag powder on the growth,yield and heavy metals content of rice in the double cropping paddy field during 2014—2015. The results showed that, compared with the treatment with no steel slag,the treatments with steel slag increased by 10.1%–25.8%, 14.3%–29.4% and 4.6%–6.2% in root growth, root activity at the late growth stages and grain yield respectively. Meanwhile, they increased by 2.4% and 3.7%, 6.6%, 2.1%, 11.1%, 5.4% in the nitrogen, phosphorus, potassium, silicon and pH value of the soil,respectively. They had little influence on the contents of Hg, Cd, Pb, As, Cr and Mn in the soil.