Optimizing drip irrigation with straw mulch return represents a promising sustainable intensification strategy for revolutionizing regional water management.This 2-year controlled field experiment examined straw incor...Optimizing drip irrigation with straw mulch return represents a promising sustainable intensification strategy for revolutionizing regional water management.This 2-year controlled field experiment examined straw incorporation effects(removal and return)and drip irrigation levels(200,350,500 mm)on maize carbon-nitrogen metabolism,root bleeding sap characteristics,dry matter accumulation,and yield.Dry matter and yield increased with irrigation amount.Under 200-350 mm irrigation,straw return enhanced root bleeding intensity;elevated nitrogen,phosphorus,potassium,calcium,and magnesium concentrations in bleeding sap;and promoted soluble sugar and hydrolyzed amino acid contents,establishing material foundations for yield formation.Straw mulching increased cytokinin while reducing abscisic acid content,delaying senescence.Leaf activities of nitrate reductase,glutamine synthetase,ribulose-1,5-bisphosphate carboxylase/oxygenase,and phosphoenolpyruvate carboxylase significantly increased under straw return,enhancing photosynthesis and improving 100-grain weight,ear length,ear diameter,and yield while decreasing bald tip length.Low irrigation amplified straw return benefits on maize growth and metabolism,whereas high irrigation negated these effects.Therefore,combining drip irrigation with straw return provides scientific foundations for water resource management in Jilin Province and theoretical bases for sustainable agricultural development in water-limited regions.展开更多
基金supported by the National Key R&D Plan Project of China(2024YFD2300101)the Jilin Provincial Science and Technology Development Plan Project(20240303026NC)the Jilin Provincial Department of Education’s“Black Soil Granary”Science and Technology Battle“Unveiling the List and Leading the Way”Scientific Research Project(JJKH20241118HT).
文摘Optimizing drip irrigation with straw mulch return represents a promising sustainable intensification strategy for revolutionizing regional water management.This 2-year controlled field experiment examined straw incorporation effects(removal and return)and drip irrigation levels(200,350,500 mm)on maize carbon-nitrogen metabolism,root bleeding sap characteristics,dry matter accumulation,and yield.Dry matter and yield increased with irrigation amount.Under 200-350 mm irrigation,straw return enhanced root bleeding intensity;elevated nitrogen,phosphorus,potassium,calcium,and magnesium concentrations in bleeding sap;and promoted soluble sugar and hydrolyzed amino acid contents,establishing material foundations for yield formation.Straw mulching increased cytokinin while reducing abscisic acid content,delaying senescence.Leaf activities of nitrate reductase,glutamine synthetase,ribulose-1,5-bisphosphate carboxylase/oxygenase,and phosphoenolpyruvate carboxylase significantly increased under straw return,enhancing photosynthesis and improving 100-grain weight,ear length,ear diameter,and yield while decreasing bald tip length.Low irrigation amplified straw return benefits on maize growth and metabolism,whereas high irrigation negated these effects.Therefore,combining drip irrigation with straw return provides scientific foundations for water resource management in Jilin Province and theoretical bases for sustainable agricultural development in water-limited regions.
