Technology-oriented approaches to reduce chemical fertilization in agroecosystems without influencing the vegetable yield is a proficient method for sustainable agriculture and environmental safety. However, short-term studies are not capable to indicate the effects of various inputs in a long run; therefore, a six-year experiment was conducted in Ningxia, China.
The experimental units were: no fertilizer control (CK: 0 kg N ha−1 ), chicken manure (M: organic N 362 kg ha−1 ), reduced chemical fertilizer (RCF: chemical N 992 kg ha−1 + organic N 362 kg ha−1 ), and conventional fertilizer (CF: chemical N 1515 kg ha−1 + organic N 362 kg ha−1 ). The study aimed to assess the effects of reduced fertilization on yield, nitrogen (N) use efficiency (NUE), N leaching, and the economic benefits. The results achieved herein indicate that RCF has significantly improved the NUE, reduced N leaching (23.7%), and improved the N economic benefit (NEB, 41.8%) as compared to the CF.
Based on yield, net benefit, and NUE conditions, the optimum N application range was 634–821 kg N ha−1 for tomato and 556–778 kg N ha−1 for cucumber. The study concluded that reduced chemical application of N is an important factor to control environmental pollution and improve fertilizer use efficiency. Further experiments are suggested to examine the optimum N rate provision from chemical fertilizer and its ratio with organic fertilization.
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Geng, Yucong & Bashir, Muhammad & Zhao, Ying & Luo, Jianhang & Liu, Xiaotong & Li, Feng & Wang, Hongyuan & Raza, Qurat-Ul-Ain & Rehim, Abdur & Zhang, & Liu, Hongbin. (2022). Long-Term Fertilizer Reduction in Greenhouse Tomato-Cucumber Rotation System to Assess N Utilization, Leaching, and Cost Efficiency. Sustainability. 14. 4647. 10.3390/su14084647.