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[Root morphological changes in maize and soybean intercropping system under different phosphorus levels].

Xiao-Min Qin¹, Hao-Nan Pan¹, Jing-Xiu Xiao¹

¹College of Resources and Environmental Science, Yunnan Agricultural University, Kunming 650201, China.

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology

|October 18, 2021

Summary

This summary is machine-generated.

Intercropping maize and soybean enhances root growth and phosphorus uptake, even with reduced phosphate fertilizer. This strategy improves nutrient efficiency and crop yield potential.

Keywords:

P level P uptake maize-soybean intercropping root morphology

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Area of Science:

Agricultural Science
Agronomy
Plant Physiology

Background:

Phosphorus (P) is a crucial nutrient for crop growth, and its availability is often limited in soils.
Understanding plant responses to P availability and optimizing P use efficiency are critical for sustainable agriculture.

Purpose of the Study:

To investigate how intercropping maize and soybean affects root morphology and phosphorus (P) uptake under varying P levels.
To determine the relationship between altered root traits and improved P acquisition in intercropping systems.

Main Methods:

A pot experiment was conducted using three P levels: P0 (0 mg P2O5·kg-1), P50 (50 mg P2O5·kg-1), and P100 (100 mg P2O5·kg-1).
Root morphological parameters (length, surface area, volume, dry weight, diameter) and P uptake were measured for monocropped and intercropped maize and soybean.
Phosphorus uptake equivalent ratio (LERp) was calculated to assess intercropping advantage.

Main Results:

Intercropping significantly increased root length, surface area, volume, and dry weight for both maize and soybean, while decreasing root diameter.
The phosphorus uptake equivalent ratio (LERp) was consistently greater than 1, indicating a P uptake advantage in intercropping, irrespective of P levels.
Increased maize root surface area and soybean root length were identified as key mechanisms driving efficient P uptake.

Conclusions:

Maize and soybean intercropping significantly improves root morphology and enhances phosphorus uptake.
Root trait modifications, specifically increased root surface area in maize and root length in soybean, are crucial for efficient P acquisition.
Intercropping offers a viable strategy to maintain crop P uptake while reducing phosphate fertilizer application, promoting sustainable nutrient management.