Study On The Effects Of Compound Fertilizer And Humic Acid Liquid Fertilizer Amendments On Metal Contamination Accumulation In Rice

[Objective]The aim of this experiment is to study the effects of compound fertilizer and humic acid liquid fertilizer amendments on heavy metal accumulation in Rice, and to provide more data for the heavy metal pollution control.[Method]Selecting Jin Nong Simiao rice to be a experimental base,The experimental field of the total area is900square meters,the experimental plots were divided into15intervals,arranging with intervening spaces.The irrigation water is local irrigation,Tama Kosaku (including seedling, planting, fertilization, irrigation) were in professional and technical personnel management and guidance.We randomly divided the plot into3replicates of5kinds of treatment.NamelyrA treatment, water;B treatment,36g/m2compound fertilizer as base fertilizer, C、D、E treatment,humic acid fertilizer19g/m2,18g/m2,36g/m2as base fertilizer.In the rice tillering stage, development stage, filling stage, B treated using compound fertilizer (36g/m2), C, D, E treatment using humic acid fertilizer No.2sprayed one time.The experimental period is96days, collecting paddy mud, water, rice, rice straw, lead, cadmium, chromium, laboratory testing, arsenic, copper, fluorine content and pH value.According to "Standards for irrigation water quality"(GB5084-2005),"Edible agricultural products producing environmental quality evaluation standards"(HJ332-2006),"Standards of contaminants in foods"(GB2762-2005) and enrichment factor (BCFs) evaluated irrigation water, soil, rice.[Result]1.Irrigation water and the water samples detected value have no significant difference (P>0.05), and in accordance with the standards for irrigation water quality;The first day the soil pH value was7.0±0.1,lead,cadmium,chromium,arsenic,copper,fluorine content were41.68±0.53,0.34±0.01,38.47±2.36,1.61±0.15,59.83±2.89,90.31±4.21mg/kg,the detection value among different treatments were not statistically significant (P>0.05),Only the cadmium content the edible quality of agricultural standard0.04mg/kg.To compare the end of the experiment with the experiment of first days:the arsenic content, A, C, B, A content of copper, lead, cadmium, chromium, C content decreased (P>0.05);D, E lead, cadmium, chromium content, B, D, E processing of copper content were not statistically significant (P>0.05); elevated fluoride content of each treatment (P<0.05).2.At the meter of72%,the water treatment, chromium, lead, cadmium in rice arsenic, copper, fluorine content were0.50±0.05,0.17±0.02,0.15±0.01,0.09±0.03,5.04±0.04,0.70±0.03mg/kg,the lead content of food contaminants, beyond the limits of0.3mg/kg, the rest of the test values in the standard range.3.Lead content of each treatment of rice were0.50±0.05,0.52±0.04,0.44±0.07,0.39±0.07,0.42±0.08mg/kg,exceeded the national standard, in which, there was no significant difference in compound fertilizer and water treatment of lead content (P>0.05), humic acid fertilizer treatment of lead were significantly lower than those of water treatment and compound fertilizer treatment (P<0.05), there was no significant difference of lead content in humic acid fertilizer treatments (P>0.05);The cadmium content in rice were0.17±0.02,0.25±0.02,0.15±0.03,0.14±0.03,0.14±0.02mg/kg, just beyond the limits of compound fertilizer treatment was significantly higher than that of water treatment and humic acid fertilizer treatment (P<0.05), there was no significant difference in the treatment of humic acid liquid fertilizer and water treatments (P>0.05);The fluorine content of each treatment of rice were0.70±0.03,0.62±0.02,0.82±0.03,0.87±0.03,1.06±0.05mg/kg, compound fertilizer treatment was significantly lower than that of fluorine content in water treatment (P<0.05), humic acid fertilizer treatments was higher than the water treatment and compound fertilizer treatment (P<0.05).4.Rice lead BCFs were0.012±0.0012,0.012±0.0009,0.010±0.0019,0.010±0.0019,0.010±0.0020,difference of compound fertilizer lead BCFs and water treatment was not significant (P>0.05), humic acid fertilizer treatments lead BCFs were significantly lower than the water treatment and compound fertilizer treatment (P<0.05);Cd BCFs were0.48±0.05,0.65±0.06,0.46±0.08,0.42±0.08,0.39±0.06, compound fertilizer CD BCFs were significantly higher than that of water treatment and humic acid fertilizer treatment (P<0.05), no significant difference of liquid humic acid fertilizer9g/m2treatment and water treatment (P>0.05),18g/m2treatment of cadmium,36g/m2BCFs below the water treatment (P<0.05).05);Lead content in different treatment of rice with straw in the highest, followed by bran, rice (P<0.05); water treatment, compound fertilizer treatment of cadmium content in rice was highest, followed by straw, chaff (P<0.05), humic acid fertilizer treatments with straw in the highest, followed by the rice, rice bran (P<0.05).[Conclusion]1.The experimental base of paddy soil pH value, lead, cadmium, chromium, arsenic, copper, fluorine, nitrogen, phosphorus, potassium, calcium detection background value difference between each treatment,only the cadmium content than the consumption of0.04mg/kg standard environmental quality evaluation of agricultural products; the detection value of irrigation water are in line with the standards for irrigation water quality. At the end of the experiment, there are differences of soil heavy metal content among all treatments, and heavy metal sedimentation, and fixed effects of humic acid.2.The water treatment soil lead is41.46±0.77mg/kg, lead content in rice beyond the limits of0.3mg/kg; soil cadmium exceeded the limits of0.04mg/kg, did not lead to cadmium exceeded the limit standard; that "gold farmers Simiao" to lead a strong enrichment ability.3.Compound fertilizer can reduce the fluorine content of rice, increase the accumulation of CD, the chaff and straw cadmium migration to rice, lead content of cadmium in rice beyond the limits of0.05mg/kg. 4.Humic acid fertilizer can reduce the accumulation of lead in rice, cadmium, lead, cadmium in stalk will block, the cadmium content in rice with the limited standards; can improve rice crude protein and calcium content; fluorine content of rice improvement, that related to high fertilizer background value.