| To identify a new type of urea for potato cultivation in northern Shaanxi, a study was conducted using six treatments: no nitrogen (control), normal urea, structured net urea, humic acid urea, zinc urea and controlled-release urea. The effects of these treatments on nitrogen accumulation, yield, and nitrogen use efficiency in potato were evaluated. The results showed that the application of humic acid urea, controlled-release urea and zinc urea increased the weight per plant and the number of tubers, with yield increases of 17.63%, 8.21%, and 4.70%, respectively, compared with normal urea. These new types of urea effectively improved nitrogen content in various plant organs and total nitrogen uptake, with humic acid urea showing superior performance. This treatment led to a statistically significant improvement over normal urea and increased economic returns by 5,502.11 yuan/hm2. Compared to normal urea, humic acid urea and controlled-release urea improved nitrogen use efficiency indexes, including nitrogen utilization rate, nitrogen partial productivity, nitrogen agronomic efficiency, and nitrogen contribution rate, by 0.97~7.43%, 5.48~15.39 kg/kg, and 3.77~9.47%, respectively. This study suggests that humic acid urea and controlled-release urea are highly effective for potato production and merit broader adoption in agriculture. |
