Effect of Post-Drought Rehydration on Winter Wheat Fluorescence and Photosynthetic Indices under Different Levels of Nitrogen Application

Studying the response of winter wheat to post-drought rehydration is conducive understanding efficient utilization water-saving technology, such as regulating deficit irrigation and increasing water use efficiency. The controlled condition experiment in rain shelter was conducted 2020. two stress treatments, including at jointing heading stages, were combined with high nitrogen (N) (250 kg/hm2), low N (125 no (0 kg/hm2, control). effects on relative chlorophyll content (SPAD), major fluorescence parameters, photosynthetic indexes determined. results showed that increased SPAD value, efficiency light energy conversion, maximum potential photo-electron transport, indices decreased photochemical quenching coefficient. Among them, compensatory effect stage SPAD, more significant (p < 0.05), needed a recovery process after rehydration. Increased application fertilizer can alleviate parameters properties flag leaf promote degree specific follows: > application. As result, had certain timely drought stress; could be enhanced under