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Journal of Agriculture ›› 2025, Vol. 15 ›› Issue (9): 44-49.doi: 10.11923/j.issn.2095-4050.cjas2024-0117

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Effects of Novel Urea on Yield and Nitrogen Fertilizer Efficiency of High-yield Summer Maize

QIU Kaili(), MENG Aoxue, YANG Qirui, GENG Sainan, WANG Yilun()   

  1. College of Resource and Environment, Henan Agricultural University, Zhengzhou 450046
  • Received:2024-06-11 Revised:2024-09-24 Online:2025-09-20 Published:2025-09-17

Abstract:

To clarify the impact of novel urea on yield and the efficiency of nitrogen fertilizer in summer maize, and to provide theoretical basis and technical support for its large-scale promotion and application, treatments were set as followed: no nitrogen fertilizer application (T1), local farmers’ habitual fertilization (T2, N 216 kg/hm2), conventional optimized fertilization (T3, N 210 kg/hm2), controlled release urea and humic acid urea in a 1:1 ratio (T4, N 210 kg/hm2), controlled release urea and humic acid urea in a 1:1 ratio with a 10% reduction of N for each (T5, N 168 kg/hm2), controlled release urea (T6, N 210 kg/hm2), and controlled release urea with a 20% reduction of nitrogen (T7, N 168 kg/hm2). The effects of different fertilization treatments on yield, nitrogen absorption and utilization, and soil available nitrogen of summer maize were studied. The results showed that the yield of summer maize from T3 to T7 increased by 13.89% to 18.04% compared to T1, with T5 showing the largest increase. Compared with T1 and T2, T3 to T7 all increased the aboveground nitrogen accumulation and soil available nitrogen content during the mature stage of summer maize, and T5 showed significant differences in aboveground nitrogen accumulation compared to T1 and T2 (P<0.05). In addition, the nitrogen fertilizer utilization rate of T5 was as high as 60.22%, and the nitrogen fertilizer partial productivity was 74.56 kg/kg. In conclusion, optimizing nitrogen application can promote the increase of summer maize yield. Under the experimental conditions, the 1:1 combination of controlled release urea and humic acid urea with a 10% reduction of nitrogen for each can be promoted and applied in the high-yield area of summer maize in northern Henan Province.

Key words: controlled release urea, humic acid urea, novel urea, summer maize, yield, nutrient accumulation, nitrogen fertilizer efficiency