有机肥-膨润土-腐植酸复合调理剂对黄壤土吸附氮素的影响
发布时间：2019-01-10 12:58
【摘要】：为了有效提高黄壤烟田土壤对氮素的吸持能力,降低氮素流失对环境造成的影响,通过土壤培养试验和等温吸附试验研究了商品有机肥-膨润土-腐植酸(HA)配制成的土壤调理剂对黄壤铵态氮(NH_4~+-N)吸持特性的影响。结果表明,在本试验条件下,土壤调理剂对土壤NH_4~+-N吸附的影响随着培养时间的延长表现出逐渐增加的趋势,土壤培养60 d氮素吸附量达到最高值546.34 mg/kg。各处理NH_4~+-N的等温吸附曲线可以用Langmuir方程很好地拟合。随着土壤调理剂用量的增加,土壤NH_4~+-N最大吸附量Qmax也逐渐提高。土壤调理剂中腐植酸的添加比例可以调节黄壤对NH_4~+-N的吸持能力,调理剂中腐植酸添加量为20%时,黄壤对NH_4~+-N的吸附容量和强度指标均显著增加。在烤烟生产上可选择有机肥-膨润土-腐植酸三者配比为6∶2∶2的土壤调理剂,且根据不同烟田土壤肥力状况确定具体施用量。土壤调理剂能有效地调控黄壤氮素容量和强度指标,对黄壤NH_4~+-N吸持力具有明显的促进作用,在生产上可保证烤烟前期生长对氮素营养的需求,同时降低氮素的环境风险。
[Abstract]:In order to effectively improve the nitrogen uptake capacity of tobacco soil in yellow soil, and reduce the impact of nitrogen loss on the environment, The effects of soil conditioning agent made of commercial organic fertilizer, bentonite and humic acid (HA) on the absorption characteristics of ammonium nitrogen (NH_4~ N) in yellow soil were studied by soil culture test and isothermal adsorption test. The results showed that the effect of soil conditioner on soil NH_4~ N adsorption showed a trend of increasing with the prolongation of culture time, and the nitrogen adsorption capacity reached the highest value of 546.34 mg/kg. after 60 days of soil culture. The isothermal adsorption curves of NH_4~-N can be fitted well by Langmuir equation. With the increase of the amount of soil conditioning agent, the maximum adsorption capacity of NH_4~-N increased gradually. The ratio of humic acid to soil conditioning agent could adjust the absorption capacity of NH_4~ N in yellow soil. When the amount of humic acid added in soil conditioning agent was 20, the adsorption capacity and intensity index of NH_4~ N on yellow soil increased significantly. In the production of flue-cured tobacco, the soil conditioner with the ratio of organic fertilizer, bentonite and humic acid is 6:2:2, and the application amount is determined according to the soil fertility of different tobacco fields. The soil conditioning agent can effectively regulate the nitrogen capacity and intensity index of yellow soil, promote the absorption of NH_4~ N in yellow soil, and ensure the demand of nitrogen nutrition for the early growth of flue-cured tobacco in production. At the same time, the environmental risk of nitrogen was reduced.
【作者单位】： 西南大学资源环境学院;安徽中烟工业有限责任公司;湖南中烟工业有限责任公司;广西中烟工业有限责任公司;
【基金】：中国烟草总公司重点项目“山地烟田分类治理与降酸提质关键技术研究与应用”(110201502015) 广西中烟工业有限责任公司科技项目“奉节县烟区以农家肥为主的土壤改良及烟叶质量提升研究”(CG2016109022)
【分类号】：S156;S572
本文编号：2406343
[Abstract]:In order to effectively improve the nitrogen uptake capacity of tobacco soil in yellow soil, and reduce the impact of nitrogen loss on the environment, The effects of soil conditioning agent made of commercial organic fertilizer, bentonite and humic acid (HA) on the absorption characteristics of ammonium nitrogen (NH_4~ N) in yellow soil were studied by soil culture test and isothermal adsorption test. The results showed that the effect of soil conditioner on soil NH_4~ N adsorption showed a trend of increasing with the prolongation of culture time, and the nitrogen adsorption capacity reached the highest value of 546.34 mg/kg. after 60 days of soil culture. The isothermal adsorption curves of NH_4~-N can be fitted well by Langmuir equation. With the increase of the amount of soil conditioning agent, the maximum adsorption capacity of NH_4~-N increased gradually. The ratio of humic acid to soil conditioning agent could adjust the absorption capacity of NH_4~ N in yellow soil. When the amount of humic acid added in soil conditioning agent was 20, the adsorption capacity and intensity index of NH_4~ N on yellow soil increased significantly. In the production of flue-cured tobacco, the soil conditioner with the ratio of organic fertilizer, bentonite and humic acid is 6:2:2, and the application amount is determined according to the soil fertility of different tobacco fields. The soil conditioning agent can effectively regulate the nitrogen capacity and intensity index of yellow soil, promote the absorption of NH_4~ N in yellow soil, and ensure the demand of nitrogen nutrition for the early growth of flue-cured tobacco in production. At the same time, the environmental risk of nitrogen was reduced.
【作者单位】： 西南大学资源环境学院;安徽中烟工业有限责任公司;湖南中烟工业有限责任公司;广西中烟工业有限责任公司;
【基金】：中国烟草总公司重点项目“山地烟田分类治理与降酸提质关键技术研究与应用”(110201502015) 广西中烟工业有限责任公司科技项目“奉节县烟区以农家肥为主的土壤改良及烟叶质量提升研究”(CG2016109022)
【分类号】：S156;S572
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