Effects of Phosphorus Stress on Plant Growth,Dry Matter Accumulation and Phosphorus Use Efficiency of Cigar Tobacco

Shi Nuo; Kong Guanghui; Zhang Guanghai; Zhao Gaokun; Wu Yuping; Li Wei; Li Yongping; Li Qing; Yao Heng; Bai Yuxiang

doi:10.14083/j.issn.1001-4942.2025.03.018

Abstract：To clarify the effects of phosphorus stress on dry matter accumulation and phosphorus utiliza-tion rate of cigar tobacco,in order to provide scientific bases for phosphorus nutrition regulation of cigar tobac-co,this experiment was conducted by using Yunxue 38 and Yunxue 39 as materials,and setting three treat-ments of total phosphorus(1 ×P),phosphorus deficiency(-P)and high phosphorus(+P).The tobacco plant morphology,agronomic traits,dry matter accumulation and phosphorus use efficiency were studied under dif-ferent treatments.The results showed that at 30 to 40 days after transplantation,the leaves of Yunxue 38 be-came shriveled under+P treatment,while those grew slowly and showed obvious purple red and yellow white spots under-P treatment;the leaves of Yunxue 39 were mottled and yellowing under+P treatment,but showed purple only in old leaves under-P treatment with slow growth and no yellowing of new leaves.The ag-ronomic traits of the two varieties under-P and+P treatments were lower than those of the 1×P treatment.The dry matter accumulation was basically the highest in the+P treatment.The total plant dry weight of Yunxue 38 and Yunxue 39 under+P treatment increased by 6.56％and 16.22％respectively compared with the 1×P treatment.The+P treatment did not increase the phosphorus apparent utilization rate and phosphorus agronomy utilization rate,but decreased by 30.75％and 4.91％respectively compared with the 1 ×P treatment.In con-clusion,the growth performance and phosphorus use efficiency of cigar tobacco were significantly affected by phosphorus supply conditions.Under phosphorus deficient conditions,the tobacco plants grew slowly andwere short and small,so the biomass and phosphorus content decreased;under the high phosphorus treatment,the dry matter accumulation and phosphorus content in tobacco leaves increased,but the phosphorus use efficiency was not significantly improved.