PDF(Pubmed)
Abstract：
The great challenge of reducing soil nutrient depletion and assuring agricultural system productivity in low-income countries caused by limited synthetic fertilizer use necessitates local and cost-effective nutrient sources. We estimated the changes of the nitrogen budget of agricultural systems in the East African Community from 1961 to 2018 to address the challenges of insufficient nitrogen inputs and serious soil nitrogen depletion in agricultural systems of the East African Community region. Results showed that total nitrogen input increased from 12.5 kg N ha-1yr-1 in the 1960s to 21.8 kg N ha-1yr-1 in the 2000s and 27 kg N ha-1yr-1 in the 2010s. Total nitrogen crop uptake increased from 12.8 kg N ha-1yr-1 in the 1960s to 18.2 kg N ha-1yr-1 in the 2000s and 21.8 kg N ha-1yr-1 in the 2010s. Soil nitrogen stock increased from -2.0 kg N ha-1yr-1 in the 1960s to -0.5 kg N ha-1yr-1 in the 2000s and 0.3 kg N ha-1yr-1 in the 2010s. Our results allow us to substantiate for the first time that soil nitrogen depletion decreases with increasing input of nitrogen in agricultural systems of the East African Community region. This suggests that increases in nitrogen inputs through biological nitrogen fixation and animal manure are the critical nitrogen management practices to curb soil nitrogen depletion and sustain agricultural production systems in the East African Community region in order to meet food demand for a growing population.
UNASSIGNED: The online version contains supplementary material available at 10.1007/s13593-023-00881-0.
UNASSIGNED: The online version contains supplementary material available at 10.1007/s13593-023-00881-0.
摘要：
由于使用有限的合成肥料，在低收入国家减少土壤养分消耗和确保农业系统生产力的巨大挑战需要当地和具有成本效益的养分来源。我们估计了1961年至2018年东非共同体农业系统氮预算的变化，以应对东非共同体地区农业系统氮投入不足和土壤氮严重枯竭的挑战。结果表明，总氮输入从1960年代的12.5kgNha-1yr-1增加到2000年代的21.8kgNha-1yr-1和2010年代的27kgNha-1yr-1。总氮作物吸收从1960年代的12.8kgNha-1yr-1增加到2000年代的18.2kgNha-1yr-1和2010年代的21.8kgNha-1yr-1。土壤氮储量从1960年代的-2.0kgNha-1yr-1增加到2000年代的-0.5kgNha-1yr-1和2010年代的0.3kgNha-1yr-1。我们的结果使我们能够首次证实，随着东非共同体地区农业系统中氮输入的增加，土壤氮的消耗减少。这表明，通过生物固氮和动物粪便增加氮素投入是遏制东非共同体地区土壤氮素消耗和维持农业生产系统的关键氮素管理措施，以满足不断增长的人口对粮食的需求。
UNASSIGNED：在线版本包含补充材料，可在10.1007/s13593-023-00881-0获得。
UNASSIGNED：在线版本包含补充材料，可在10.1007/s13593-023-00881-0获得。
