Research status and prospect of ratoon rice in China under mechanically harvested condition
The proportion and area of ratoon rice planting in China have been substantially increased,due to con-tinuous improvement of rice breeding methods and consecutive innovation of cultivation technology,which has developed into one of rice planting modes with significant production efficiency.Combining the experience in re-search and practice,from the perspective of crop physiology and ecology,we reviewed the current situation and prospects of high-yielding formation and physiological mechanisms of ratoon rice.We focused on four key aspects:screening and breeding of ratoon rice cultivars and the classification;suitable stubble height for mechanically har-vested ratoon rice,as well as water and fertilizer management;dry matter production and allocation in ratoon rice and the relationship with yield formation;regenerative activity and vigor of ratoon rice roots and their relationship with rhizosphere micro-ecological characteristics.As for the extending of mechanized low-cut stubbles ratoon rice technique,we should properly regulate the rhizosphere system,coordinate rhizosphere nutrient supply,germination of axillary buds,and tillering regeneration,to achieve the target of"four-high-one-low",that is high regeneration coefficient,high number of regeneration panicle,high harvest index,high yield,high quality,low-carbon and safe,aiming to improve the sustainability of ratoon rice industry.
ratoon ricemechanizationleft stubble heightregeneration abilityaxillary bud sproutcarbon sequestration and mitigation
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