施加铁炉渣对福州平原稻田土壤养分动态的影响

Effects of Adding Iron Slag on Soil Nutrient Dynamics and Rice Yield in Paddy Fields of Fuzhou Plain

为了阐明施加铁炉渣对稻田土壤养分动态及水稻产量的影响,以福州平原稻田为研究区域,采用原位采样与室内分析对铁炉渣施加后稻田土壤速效氮、速效磷、速效钾、有效硅、微生物量碳、溶解性有机碳、土壤交换性钙、交换性镁以及水稻产量进行测定。结果表明,对照,2,4,8Mg/hm2铁炉渣施加样地速效氮含量平均值分别为7.90,10.85,16.61,8.96mg/kg;速效磷含量的平均值分别为3.13,4.57,5.06,5.54mg/kg;速效钾含量的平均值分别为141.37,136.99,141.77,141.17mg/kg;有效硅含量的平均值分别为329.66,920.63,1 093.41,1 294.58mg/kg;交换性镁离子含量的平均值分别为0.046,0.053,0.048,0.040cmol/kg;交换性钙离子含量的平均值分别为0.032,0.033,0.045,0.046cmol/kg;微生物量碳含量的平均值分别为523.64,719.19,669.49,623.91mg/kg;溶解性有机碳含量的平均值分别为210.49,260.31,263.49,259.67mg/kg。施加铁炉渣增加了土壤速效氮、速效磷、有效硅、微生物量碳、溶解性有机碳和土壤交换性钙的含量,但对土壤交换性镁和速效钾含量的影响不显著,与此同时还增加了水稻产量。可见,铁炉渣可作为与特定肥料施加结合的有效土壤改良剂。

To clarify effects of iron slag adding on soil nutrient dynamics and rice yield in paddy fields, the soil nutrient dynamics and rice yield in Fuzhou plain paddy fields after adding different levels of iron slag were determined and analyzed. There were four treatments, one treatment as control plot, other three treatments were to add 2, 4, 8 Mg/hm2 slag. The results showed. The averaged values of available nitrogen, available phosphorus, available potassium, available silicon, Mg2＋, Ca2＋, MBC, DOC content were 7. 90, 10. 85, 16. 61, 8. 96 mg/kg; 3.13, 4.57, 5. 06, 5. 54 mg/kg; 141. 37, 136. 99, 141. 77, 141. 17 mg/kg;329. 66, 920. 63, 1 093.41, 1 294.58 mg/kg; 0.046, 0.053, 0. 048, 0.040 cmol/kg;0. 032, 0.033, 0. 045, 0.046 cmol/kg;523.64, 719.19, 669.49, 623.91 mg/kg; 210.49, 260. 31, 263.49, 259.67 mg/kg. The application of iron slag not only increased the available nitrogen, available phosphorus, available silicon, MBC, DOC and Ca2＋ content in the soil, but also increased the rice yield. The available potassium and Mg2＋ content in the soil did not change significantly. So, iron slag can be seen as an effective soil conditioner in conjunction with a specific fertilizer applied.