Patterns of crop-specific fertilizer-nitrogen losses and opportunities for sustainable mitigation: A quantitative overview of ¹⁵N-tracing studies

Abstract

● Pattern and mitigation potential of crop-specific fertilizer-N losses were assessed.

● China showed high fertilizer-N losses due to high N application rates and low SOC.

● MAP, SOC, and soil pH are key parameters affecting fertilizer-N losses.

● At a given application rate, soils with higher SOC have lower fertilizer-N losses.

● Optimal N rate combined with SOC improvement could cut 34.8%−59.6% of N losses.

Understanding crop-specific fertilizer-nitrogen (N) loss patterns, driving factors, and mitigation potentials is vital for developing efficient mitigation strategies. However, analyses based on the gross magnitude of fertilizer-N losses within a growing season remain fragmented and inconclusive at a global scale. To address this gap, we conducted a global meta-analysis using 940 observations from 79 published ¹⁵N-tracing studies to assess the effects of natural factors, soil parameters, and N application rates on gross fertilizer-N losses in cereal-cropped soils. We found that China had the highest conventional fertilizer-N application and loss rates (230−255 and 75.9−114 kg N ha⁻¹ season⁻¹, respectively) and the lowest soil organic carbon (SOC) contents (10.6 g kg⁻¹) among the countries examined. Mean annual precipitation, SOC content, and soil pH were key parameters affecting fertilizer-N losses in wheat-, maize-, and rice-cropped soils, respectively. Fertilizer-N application rates were positively correlated with N loss amounts, while higher SOC levels led to lower losses. Adopting optimized N application rates combined with improving SOC levels could potentially mitigate 34.8%−59.6% of N losses without compromising crop yields compared with conventional practices. This study underscores the critical role of SOC in reducing N losses and suggests that future research should focus on innovative strategies and efficient organic amendments for enhanced SOC sequestration.

Graphical abstract

Keywords

fertilizer-nitrogen loss / crop-specific / ¹⁵N tracing / soil organic carbon / meta-analysis

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