| 摘要: |
| 采用不同的添加材料与化学磷肥混合,通过室内扩散试验,研究不同添加材料对化学肥料中磷素释放和扩散的影响。结果发现,选用的5种材料(沸石、胡敏酸、聚丙烯酰胺、柠檬酸、羧甲基纤维素)均能不同程度地提高肥料磷在土壤中的有效性。与对照相比,柠檬酸在培养初期(1周)能够促进化学磷肥的溶解和扩散,可使施肥点和外围的速效磷含量升高约2.7倍;胡敏酸、PAM在培养4周后能提高施肥点的速效磷,而且使最外层(7～9 cm)的速效磷也有较明显的增加,分别较对照提高75%和68%。 |
| 关键词: 磷肥 肥料添加材料 磷素扩散 磷素释放 |
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| 基金项目:陕西省自然科学基金项目(2003C106) |
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| Effect of different amendments on the release and diffusion of phosphorus from chemical fertilizer |
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| Abstract: |
| In this paper,different kinds of amendments such as Zeolite,Humic acid,PAM,Citric acid and Carboxy methyl were used for mixing with phosphate.The release and diffusion of phosphorus in soil were studied by incubation experiment.The results showed that all the amendments could increase the availability of phosphorus from chemical fertilizer in soil.Citric acid could increase the sdution and diffusion of phosphorus of chemical fertilizer in the first week by 2.7 times.After 4 weeks incubation,humic acid and PAM could increase the concentration of available phosphorus at the fertilization point and the available P increased by 75% and 68% in outer layer (7-9 cm) compared with the control. |
| Key words: phosphate fertilizer amendment phosphorous diffusion and release |
