Effects of Different Ridging Time on Growth Period and Quality of Flue-cured Tobacco in Luoyang Tobacco Growing Area

QIAN Jiancai; ZHU Yufei; DAN Dongchun; HUANG Wuxing; ZHANG Li

doi:10.15933/j.cnki.1004-3268.2025.08.006

Abstract：In order to solve the problems of delayed maturation and quality decline of tobacco plants caused by frequent drought in Luoyang tobacco growing areas,Qinyan 96 was used as the experimental material,and three treatments were set up:Spring ridge raising(CK),winter ridge raising,and autumn plowing and winter ridge raising.The effects of different ridge raising time on soil moisture,tobacco field growth period,agronomic traits,root activity,carbon and nitrogen metabolism related characteristics,as well as the conventional chemical composition and sensory quality of tobacco leaves after roasting were explored.The results showed that winter plowing and winter plowing treatments significantly increased soil moisture and advanced the field growth period of tobacco by 10 and 16 days,respectively,compared to CK.Before the tobacco plant maturity period,root activity showed the order of autumn tillage and winter ridging treatment>winter ridging treatment>spring ridging treatment.The height,stem circumference,and number of leaves of tobacco plants treated with autumn plowing and winter ridge raising were all greater than or equal to other treatments,and the maximum leaf length and width during the vigorous and mature stages were both greater than other treatments.In the late stage of field growth,the activities of nitrate reductase(NR),glutamine synthetase(GS),sucrose phosphate synthetase(SPS),sucrose synthetase(SS),and the expression levels of related genes(NtNR,NtGS,NtSPS,NtSS)in tobacco treated with winter ridge formation,autumn tillage and winter ridging formation were significantly reduced.In addition,the content of nicotine,total nitrogen and chlorine in cured tobacco leaves decreased,the content of potassium increased,and the ratio of potassium to chlorine and sugar to alkali increased.Among them,the chemical composition of tobacco leaves treated with autumn plowing and winter ridging was more suitable.The tobacco leaves treated with autumn tillage and winter ridging had a good aroma,sufficient quantity,less impurities,a comfortable and clean aftertaste,and the best sensory quality.In summary,the use of autumn plowing and winter ridge raising in Luoyang tobacco growing areas can shorten the growth period of tobacco,promote the transformation of internal substances,optimize the sensory quality of tobacco leaves,and improve the quality of tobacco leaves.