Effects of various fertilizer application structures on dry matter accumulation and distribution of flue-cured tobacco

The differences of flue-cured tobacco dry matter accumulation under three fertilizer structures(no fertilizer application,only organic fertilizer application,organic and mineral fertilizer combined application) had been investigated.Theresults indicated that flue-cured tobacco dry matter accumulation had slow-fast-slow style under three fertilizer structures,the peak of dry matter accumulation rate appeared between 60～75 d after transplanting,dry matter accumulation accounted for over 90 percent after 90 days transplanting.At the same period,the order of the dry matter accumulation was organic and mineral fertilizer combined application treatmentonly organic fertilizer application treatmentno fertilizer application treatment.Under no fertilizer application condition,dry matter in roots,stems and leaves accounted for whole dry matter 14.4%,34.6% and 51.0%,respectively.The percentage was 17.5%,30.1% and 52.4% under only organic fertilizer application.While the percentage changed into 15.9%～17.1%,33.9%～34.6% and 49.0%～50.3% under organic and mineral fertilizer combined conditions.Compared with other organic and mineral combined treatments,dry matter of treatment with ratio of N:P2O5:K2O=1:1.5:3 increased by 5.3～27.3 percent.And its dry matter in roots,stems and leaves accounted for 16.74%,34.35% and 48.91% respectively.