| The stacking barren rock at iron mine will cause environmental pollution and occupy the land resources. In order to explore the improvement of barren rock bank at iron mine in Wanger Ditch, Laiyuan County, Baoding City, enhance the ecological protection, mine reclamation and virescence as well as the application of iron mine tailings, this paper adopted the pot experiment method to study the physical chemistry properties and maize yield effect of composite soil of barren rock at iron mine with different ratios by preparing the reclamation composite soil of barren rock at iron mine and soil with different ratios. The main research conclusions are as follows:(1) The soil hardness, degree of packing and volume weight of soil would be increased when mixing certain barren rock at iron mine and they would increase with the ratio of iron ore waste rock at the same depth, the increment was 5.6% ~ 285.19%, 17.55% ~ 866.04%, 3.22% ~ 26.77%, respectively.(2) The content of total N, total P and alkaline hydrolyzable N, organic matters would be decreased with the mixed soil ratio increased, while the rapid available phosphorus, rapidly available potassium, the content of available iron and p H would be increased by different range after the summer maize plantation in different ratios of iron ore waste rock and soil reclaimed mixed. If the ratio was available, the content of rapidly available potassium could increase accordingly. The content of available iron in the composite soil would increase with the ratio of mixed rock increasing, but did not exceed the standard, and it kept the normal range required by the summer maize, which indicated that the iron element existed in the barren rock of iron mine was not controlled by itself, but may be related to the catalyzed conversion of summer maize.(3) The reclamation composite soil of barren rock at iron mine with different ratios will have an effect on the biomass and yield of the summer maize, of which the ratio of rock to soil of 3:7 own the highest biomass and yield. The yield is 8344kg/hm2 increasing by 19.94%.(4) The reclamation composite soil of barren rock at iron mine with different ratios would affect the content and total amount of absorption of N and K, the distribution of K of summer maize,but had little effect on P. The best ratio that suitable for summer maize was 3:7 of rock and soil in different mixing of iron ore waste rock and soil. Namely, the reclamation composite soil of barren rock at iron mine with the ratio of 3:7 of iron ore waste rock and soil mixed could be taken as the first option for the composite soil of summer maize plantation in Wanger Ditch, which can consume the waste rock and iron mine tailings and had significant meaning on improving the reclamation, economic benefit and ecological benefit. |
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