不同粘结剂用量下肥料棒抗压性能及养分淋溶特性

为研究粘结剂用量对液压机械挤压成型的肥料棒抗压性能及养分淋溶特性。通过室内土柱淋溶法,分析了粘结剂用量分别为0%、2%、4%、6%肥料棒抗压性能及同养分配比普通肥料的养分淋溶特征。结果表明:肥料棒的正、侧压抗压强度随粘结剂用量的增加呈现出上升的趋势;另一方面肥料棒能显著降低肥料中氮、钾素的淋出率,随着粘结剂用量0%、2%、4%、6%的增加,肥料棒中氮素总累积淋出率较普通肥料分别减少了6.21%、10.52%、15.83%、22.15%,钾素总累积淋出率分别减少了26.69%、50.70%、55.50%、61.79%。说明添加粘结剂能增加肥料棒抗压性能及具有养分缓释效果,延长肥料养分释放周期,为今后热带地区果树林木专用缓释肥的相关研究提供理论依据。

Compressive Properties and Nutrient Leaching Characteristics of Fertilizer Rods Under Different Binder Contents

To study the binder content on the compressive performance of fertilizers and the nutrients leaching characteristics, the contents of different binder were used 0%, 2%, 4%, and 6%, respectively. The nutrient leaching characteristics of fertilizers with binder and common fertilizer with the same ratio of nutrients were measured by the method of soil column leaching test under room condition. And the compressive performance of the manure bars was also measured by a universal testing machine. The results showed that the positive and lateral compressive strength of fertilizer rods could be promoted with higher binder contents. Meanwhile, the nitrogen and potassium leaching rates could be reduced using the fertilizer rods. The total nitrogen leaching rates of fertilizer rods with contents of 0%, 2%, 4%, and 6% binders decreased by 6.21%, 10.52%, 15.83%, and 22.15%, respectively, and the total potassium leaching rates of fertilizer rods with contents of 0%, 2%, 4%, and 6% binders also decreased 26.69%, 50.70%, 55.50%, and 61.79%, respectively. It showed that the the compressive performance of fertilizer rods could be improved using binder, and the fertilizer rods with binder addition had the effect on delaying the release of nutrients in soil, and extended fertilizer nutrient release cycle. It would provide a theoretical basis for the related research on the special slow-release fertilizer for fruit trees in the tropical region.