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A new Rothamsted long-term field experiment for the twenty-first century: principles and practice.

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Summary

A new long-term agricultural experiment in the UK investigates sustainable cropping systems. Findings show reduced tillage decreased wheat yields, while organic amendments boosted barley, highlighting complex interactions for better farming practices.

Keywords:
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Area of Science:

  • Agricultural Science
  • Agronomy
  • Ecosystem Services

Background:

  • Agriculture faces pressure to balance food production with environmental sustainability and ecosystem services.
  • Long-term field experiments are crucial for understanding complex cropping system behaviors.
  • A new experiment was established at Rothamsted to study contrasting cropping systems.

Purpose of the Study:

  • To establish gradients of system properties and outcomes for a fundamental understanding of UK cropping systems.
  • To evaluate the impact of phased rotations, cultivation, nutrition, and crop protection strategies.
  • To inform the transition towards more sustainable agricultural practices.

Main Methods:

  • Established the Large-Scale Rotation Experiment at two contrasting UK sites in 2017-2018.
  • Implemented four management factors: phased rotations, conventional vs. reduced tillage, organic vs. mineral nutrition, and conventional vs. smart crop protection.
  • Designed a balanced system with 24 emergent cropping systems per site for analysis at system and component levels.

Main Results:

  • Observed interactions between management factors and environmental conditions affecting crop yields.
  • Reduced tillage led to lower wheat yields, with variations based on rotation, previous crop, and site.
  • Organic amendments increased spring barley yield by an average of 8%, with site-specific variations; plowed systems yielded higher calorically overall than reduced tillage systems.

Conclusions:

  • The systems-level, multi-site approach is justified by observed interactions influencing crop yields.
  • The experiment provides a long-term resource for interdisciplinary research on sustainable agriculture.
  • Documenting the design facilitates the adoption of similar system-scale experiments for sustainable cropping.