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PAR Interception and Utilization in Different Maize and Soybean Intercropping Patterns.

Xin Liu1, Tanzeelur Rahman1, Feng Yang1,2,3

  • 1College of Agronomy, Sichuan Agricultural University, Chengdu, China.

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|January 6, 2017
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Strip intercropping enhances crop radiation use efficiency (RUE) and photosynthetically active radiation (PAR) interception compared to monoculture. The SI2 configuration optimized maize-soybean intercropping for maximum PAR and RUE.

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Area of Science:

  • Agricultural Science
  • Crop Physiology
  • Agronomy

Background:

  • Intercropping systems significantly influence crop growth by altering light interception and radiation use efficiency (RUE).
  • Existing models like HHLA and ERCRT calculate intercepted photosynthetically active radiation (PAR) for intercrops, but their application across diverse configurations needs further investigation.
  • Optimizing intercropping configurations is crucial for maximizing crop productivity and resource utilization.

Purpose of the Study:

  • To evaluate and compare intercepted PAR and RUE in maize-soybean intercropping systems under various configurations.
  • To identify optimal intercropping designs for enhanced crop performance.
  • To validate simulation models for predicting dry matter accumulation based on PAR and RUE.

Main Methods:

  • Tested different strip intercropping (SI1, SI2, SI3 using ERCRT model) and row intercropping (RI using HHLA model) configurations against monoculture.
  • Quantified intercepted PAR and RUE for maize and soybean in each configuration.
  • Utilized a dry matter estimation method based on intercepted PAR and RUE, verified with experimental data.

Main Results:

  • All intercropping systems showed higher intercepted PAR and RUE than monoculture.
  • Strip intercropping resulted in 1.35 times greater soybean PAR interception than row intercropping.
  • The SI2 configuration (0.4 m maize row spacing, 1.6 m maize strip distance) yielded the highest intercepted PAR and RUE among strip intercropping systems.
  • Row intercropping (RI) significantly reduced soybean dry matter due to poor PAR interception.

Conclusions:

  • Strip intercropping, particularly the SI2 configuration, is recommended for maize-soybean cultivation to maximize PAR interception and RUE.
  • Row intercropping is not suitable for soybean due to insufficient light capture.
  • The simulation method using PAR and RUE is reliable for predicting dry matter and aids in functional-structural plant model development.