腐植酸对小白菜生长和磷素利用的影响

Effects of Humic Acid on the Growth and Phosphorus Utilization of Pakchoi

磷是植物生长必需营养元素之一,但磷肥当季利用率一般只有10%~25%,磷肥利用率低不仅造成经济损失,而且对环境产生不良后果。为验证腐植酸对小白菜生长以及磷素利用的影响,设置不添加磷肥、磷酸一铵、0.6%腐植酸、0.3%腐植酸+磷酸一铵、0.6%腐植酸+磷酸一铵、1.2%腐植酸+磷酸一铵、3.0%腐植酸+磷酸一铵、4.2%腐植酸+磷酸一铵和6.0%腐植酸+磷酸一铵等9个处理。结果表明,4.2%腐植酸+磷酸一铵与磷酸一铵处理相比小白菜产量增加4.55%,磷农学效率增加64.50%,Ca-P增加6.91%,Al-P降低2.51%,表明添加腐植酸有助于提高小白菜产量、提高磷农学效率和土壤中有效磷含量。

Phosphorus is one of the essential nutrients for plant growth,however the utilization rate of phosphate fertilizers is generally only from 10% to 25% in season.The low utilization cause both economic losses and adversed consequences for the environment.In order to test effects of humic acid on pakchoi growth and phosphorus utilization,the experiment was designed containing no phosphate,monoammonium phosphate,0.6% humic acid,0.3% humic acid + monoammonium phosphate,0.6% humic acid + monoammonium phosphate,1.2% humic acid + monoammonium phosphate,3.0% humic acid + monoammonium phosphate,4.2% humic acid + monoammonium phosphate,6.0% humic acid + monoammonium phosphate.The results showed that compared with monoammonium phosphate treatment,4.2% humic acid + monoammonium phosphate increased the yield by 4.55%,and the agronomic efficiency of phosphorus increased by 64.50%.Ca-P increased by 6.91%,and Al-P decreased by 2.51%.Humic acid chould not only promote pakchoi yield,but also increased the agronomic efficiency of phosphorus and the content of available phosphorus in soil.