马铃薯块茎消亡与氮素供应的关系OA

Nitrogen plays a critical regulatory role in the growth and development of potatoes.While many studies have focused on the mechanisms by which nitrogen influences tuberization,research specifically addressing the relationship between nitrogen supply and tuber degradation is limited.Tuber number is a key yield component;however,not all initiated tubers develop to harvest,and some are degraded,potentially due to insufficient nitrogen availability.This study investigated the effects of varying nitrogen application rates on potato tuber number dynamics using the cultivar'Favorita'.Tuber number dynamics under different nitrogen levels were observed,and the relationships between leaf total nitrogen concentration,nitrogen accumulation,and changes in tuber number were analyzed to elucidate the effect of nitrogen supply on tuber degradation.Nitrogen application rate influenced the frequency of tuber degradation,thus regulating the number of tubers per plant and ultimately affecting yield.Adequate nitrogen supply reduced the occurrence of tuber degradation.Compared with the no-nitrogen treatment,under sufficient nitrogen supply(N 300 kg/ha),the number of tubers per plant increased by 39%,and the proportion of plants with tuber degradation reduced by an average of 26%.Models describing the relationships between leaf total nitrogen concentration,nitrogen accumulation per hectare,and tuber number were established.These results provide important support for optimal nitrogen management in potatoes.