Wikipedia image
Cover crops in orchards are recognized as a sustainable practice that enhances multiple ecosystem services, yet systematic evaluations of different cover crops used in citrus orchards remain limited.
A recent study in China investigated the effects of cover crops on soil properties, soil carbon dioxide (CO2) flux, leaf physiological traits, fruit quality and yield in a citrus orchard, using clean tillage as a control. The cover crops investigated included Lolium perenne (perennial ryegrass), Trifolium repens (white clover), Vicia villosa (hairy vetch) and mixed cover crops.
The authors of an article published in Plants journal about the study are with the China Three Gorges Corporation. They are Rong-Bin Tang, Li-Juan Li, Yin-Hua Guo, Rui Yuan, Yu-Tong Feng, Jun-Chen Wang, Yun-Chao Yu, Hao-Yong Song, Jun Zhang, Di Wu and Gan-Ja Xiang.
STUDY RESULTS
Results showed that cover crop management models significantly influenced soil water content, available nitrogen (AN), available phosphorus (AP) and available potassium (AK). The V. villosa model reduced AN and AP but enhanced leaf chlorophyll (Cl) and nitrogen (N) content. Soil CO2 flux was significantly higher under V. villosa, and it showed the lowest soil moisture.
Test results revealed that AP and soil moisture were key drivers of leaf traits. No significant treatment effects on fruit quality or yield were detected within the two-year experimental period.
These findings indicate that cover crop management models rapidly alter soil properties and CO2 emissions. Longer-term observations are needed to evaluate cascading effects on fruit.
This study offers evidence-based soil management solutions and a framework for enhancing multiple ecosystem services in orchards worldwide.
TOP COVER CROP
The findings identify V. villosa as the most effective cover crop for enhancing orchard ecosystem functions. Specifically, it exhibited a superior capacity for AN and AP uptake.
Notably, the reduction of surplus soil AP by V. villosa was found to alleviate nutrient interference, thereby significantly promoting leaf chlorophyll synthesis and nitrogen accumulation in citrus trees. Soil flux increased under V. villosa due to altered soil temperature and aeration. The rapid optimization of soil fertility and tree physiological vigor provides a robust scientific basis for sustainable orchard intensification.
Fruit yield remained stable during the two-year experimental period — likely due to the time-lag effect inherent in perennial crops. This study highlights that mixed cover cropping and Fabaceae species (V. villosa) are critical strategies for achieving long-term ecological and productivity synergies in citrus cultivation.
See the full article in Plants about the research here.
Source: MDPI
Share this Post