Effect of Sediment Addition Ratio on Soil Physicochemical Properties and Rice Growth Based on Returning Utilization
In order to promote the resource util ization of sediment return to field and maximize the benefit of sediment return to field,the effects of different sediment addition ratio on soil physicochemical properties and rice growth characteristics were analyzed by pot experiment.The results showed that the contents of organic matter,total phosphorus,available phosphorus,total nitrogen and alkali-hydrolyzed nitrogen in the mixed soil increased with the increase of sediment addition ratio,and the content of heavy metals also increased simultaneously.In the test sampleswith different sediment addition ratios,the best effect on rice growth was achieved when theaddition ratio was 35%,and the growth characteristics of rice were significantly correlated with the contents of organic matter and total nitrogen in soil.It is calculated that the safe application amount of one-time sediment should not exceed 2250.00 t/hm2,and the annual application amount of continuous 50 a return field should not exceed 417.96 t/hm2.The addition of sediment can increase the nutrient content in soil and promote rice growth,but in practical application,the proportion of sediment return to field should be controlled reasonably to ensure soil health.
Sediment return to fieldSoilHeavy metalSafe application amount of sediment
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万方数据
