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Global crop production must substantially increase to meet the needs of a rapidly growing population. This is constrained by the availability of nutrients, water, and land. There is also an urgent need to reduce the negative environmental impacts of crop production. Collectively, these issues represent one of the greatest challenges of the twenty-first century. Sustainable cropping systems based on ecological principles are the core of integrated approaches to solve this critical challenge. This special issue provides an international basis for revealing the underlying mechanisms of sustainable cropping systems to drive agronomic innovations. It includes review and original research articles that report novel scientific findings on improvement in cropping systems related to crop yields and their resistance to biotic and abiotic stressors, resource use efficiency, environmental impact, sustainability, and ecosystem services.

nutrient use efficiency --- organic fertilization --- system approach --- Helianthus annuus L. --- catch crop --- Texas High Plains --- forage yield and quality --- living mulch --- nutrient cycling --- quality --- leguminous cover crop --- conservation --- light --- sustainable crop production --- crop rotation --- WHCNS --- stemborer --- complexity --- perennial --- manure --- maize production --- SOC and STN stocks --- cover crops --- forage pea --- yield --- SDS-PAGE analysis --- vineyard system --- double cropping --- wheat --- partial returns --- soybean --- vetch --- nitrogen use efficiency --- enzyme activities --- agrobiodiversity --- gross margin --- residue C and N release --- systematic review --- maize --- protein crops --- no-tillage --- environmental quality --- fall grazing --- kura clover --- cover crop --- organization --- scenario analyses --- cropping system design --- irrigation --- sustainable yield index --- multiple correspondence analysis (MCA) --- Acidic soil --- Europe --- Zea mais L. --- shade --- up-scaling --- water --- conservation agriculture --- water use efficiency --- Triticum aestivum L. --- forage sorghum --- N use efficiency --- nutrient balance --- organic cropping system --- forage --- durum wheat --- cropping systems --- nitrate --- grain yield --- nitrogen nutrition --- conventionalization --- crop residue incorporation --- cereal rye --- green manure --- straw decomposition --- hierarchical patch dynamics --- N uptake --- farmer’s perception --- pearl millet --- nitrogen --- faba bean --- agroecology --- harvesting strategies --- rice --- gluten fractions --- weed suppression --- economics --- mineral N fertilization --- push-pull technology --- growth --- potato (Solanum tuberosum)