Bio:
Email: 19861309136@163.com
陈和平(2002—),男,硕士研究生,主要从事新型肥料研究及养分利用;19861309136@163.com
为探索染色剂对包膜尿素性能的影响,以异氰酸酯与多元醇的物质的量比(R)为1.4、1.6的两组包膜尿素为研究对象,分别添加质量分数为0、0.1%、1.0%、2.0%的染色剂,对其25 ℃静水氮素释放率、疏水性、耐磨性、抗老化性和耐高温性等指标进行了测定。结果表明:在25 ℃恒温培养条件下,添加0.1%染色剂可使包膜尿素(R=1.4)的养分释放期延缓70.83%,但随着染色剂添加量的增加,养分释放期延长效果减弱;添加0.1%染色剂可提升包膜尿素的耐磨性和抗老化性,当R为1.4、1.6时,养分释放期相应延长了108.70%、90%,但耐磨性随着染色剂添加量的增加而减弱;添加少量染色剂提升肥料抗老化的性能优于大量添加的;在80 ℃高温培养条件下,添加染色剂可延长包膜尿素的养分释放期。染色剂对包膜尿素性能的影响具有双面性,在维护生态环境与土壤健康的基础上,优化添加量获得理想控释效果的同时,也要考虑染色剂对土壤的负面影响。
To investigate the effect of dyes on the performance of coated urea, two groups of coated urea with isocyanate to polyol molar ratios (R) of 1.4 and 1.6 are selected as research subjects. Dye is added at mass fractions of 0, 0.1%, 1.0%, and 2.0%, respectively. Indicators including nitrogen release rate in static water at 25 ℃, hydrophobicity, abrasion resistance, aging resistance, and high-temperature resistance are measured. The results show that under constant-temperature incubation at 25 ℃, the addition of 0.1% dye delays the nutrient release period of coated urea (R=1.4) by 70.83%. However, the delaying effect on the nutrient release period weakens with increasing dye addition. The addition of 0.1% dye improves the abrasion resistance and aging resistance of coated urea. When R is 1.4 and 1.6, the nutrient release periods are extended by 108.70% and 90%, respectively. However, abrasion resistance decreases with increasing dye addition. The performance improvement in aging resistance is better with a small amount of dye addition compared to a large amount. Under high-temperature incubation at 80 ℃, the addition of dye prolongs the nutrient release period of coated urea. The effect of dye on the performance of coated urea has dual aspects. Based on maintaining ecological environment and soil health, while optimizing the addition amount to achieve ideal controlled-release effects, the negative impacts of dyes on soil must also be considered.
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