- ISSN 1008-505X
- CN 11-3996/S
| Citation: |
LI Ya-nan, SUN Shi-yuan, LÜ Xu-dong, WANG Yan-qun, FU Xin, NING Peng, PENG Zheng-ping. Nitrogen reduction and part substitution with organic fertilizers increase winter wheat yield and fertilizer use efficiency in medium and low-yield cropland of North China Plain[J]. Journal of Plant Nutrition and Fertilizers, 2025, 31(5): 882-893. DOI: 10.11674/zwyf.2024469
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In north China, there are many problems such as low nitrogen utilization efficiency and unstable yield in the large area of medium and low yield fields. Therefore, this paper studies the influence of reducing 20% of nitrogen fertilizer and applying different amounts of organic fertilizer on winter wheat yield and fertilizer utilization rate on the basis of farmers’ practice of applying nitrogen.
During 2022−2024, a field trial was conducted for two consecutive winter wheat seasons in central of North China Plain. Seven treatments were setup, including no nitrogen fertilizer (N0), conventional nitrogen application rate (N1), reducing nitrogen rate by 20% (N2), and combined application of humic acid compound fertilizer (N3), functional bio-organic fertilizer (N4), microalgae (N5), and weathered coal bio-fertilizer (N6) at the same total N input with N2. The photosynthetic parameters of flag leaves of wheat were measured at anthesis stage. The plant samples were taken to investigate the dry matter accumulation, nitrogen uptake, and transport at the key growing stages. And grain yield and protein content were analyzed at harvest.
Compared to N2, the net photosynthetic rate increment of wheat flag leaves treated with four different organic fertilizers did not reach a significant level; the transpiration rate increased significantly by 18.6% to 33.5%, with the transpiration rate of N6 being significantly higher than N5; N3 reduced the inter-cellular CO2 concentration; N3 and N4 treatments increased dry matter accumulation at all stages, while N5 and N6 increased dry matter accumulation during the flag emergence, flowering, and maturity stages, with an increase in above-ground dry matter accumulation of 8.9% to 18.2% during maturity; N3, N4, N5, and N6 treatments increased nitrogen accumulation from green-up to flowering stages, with only N4 increasing nitrogen accumulation during maturity, by 15.8%. Compared to N1, N2 treatments either decreased or remained unchanged in pre-flowering nitrogen transport, whereas N3, N4, N5, and N6 treatments increased pre-flowering nitrogen transport. Compared to N1, N2 reduced grain weight (2022) and effective ear number per area (2023), while N3, N4, N5, and N6 treatments significantly increased effective ear number per area, grain weight, and nitrogen fertilizer agronomic efficiency, with N3 and N4 significantly increasing yield; N2, N5, and N6 treatments reduced protein content in grains, while N3 and N4 had no significant effect on protein content. Structural equation analysis results showed that fertilization directly affected wheat nitrogen and dry matter accumulation (path coefficients: 0.86, 0.90), which in turn affected leaf photosynthetic characteristics (0.52), and dry matter accumulation directly affects grain yield (0.77), the comprehensive effect of each fertilizer treatment in two years was ranked as N4>N3>N6>N5>N1>N2>N0.
Reducing nitrogen by 20% based on farmers’ practice has no significant impact on wheat photosynthetic efficiency, dry matter accumulation, and nitrogen utilization. Applying functional bio-organic fertilizers and humic acid compound fertilizers with 20% nitrogen reduction can further increase the accumulation of dry matter and nitrogen during all growth stages, promoting the transfer of dry matter and nitrogen to grains. This ultimately significantly boosts wheat yield and protein content, enhancing nitrogen fertilizer efficiency. Applying weathered coal bio-fertilizer with 20% nitrogen reduction can increase nitrogen accumulation before flowering, but the nitrogen accumulation during flag leaf emergence and flowering is notably lower compared to applying functional bio-organic fertilizers after a 20% nitrogen reduction. Considering the large area of medium-and low-yield wheat fields in the North China Plain, it is recommended that applying functional bio-organic fertilizers with 20% nitrogen reduction can achieve cost savings and increased efficiency.
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