Accumulation of dry matter and mineral nutrients in cigar wrapper tobaccos

The content of dry matter and mineral nutrients of cigar wrapper tobaccos was analyzed in different growth periods in 2009.The results showed that all organs grew slowly and the content of mineral nutrients was low in 30 d after transplanting in Tongxiang,Zhejiang Province.After 30 d,all organs grew faster and the accumulation speed of dry matter and mineral nutrients were fastest in this period,which was very important period for the yield and quality of the cigar wrapper tobacco.After 50 d,every organ grew obviously slowly and the content of mineral nutrients also reduced,but the plant always took the leaf as distributive center.Therefore,in the earlier stage of the cigar wrapper tobacco,basal fertilizers should be applied with large amount and additional fertilizers should be applied earlier to meet the need of plant growth.In the later stage,the absorptive capacity of every organ to the mineral nutrition reduced,and the total amount also became lower,when the additional fertilizers should be applied to raise the quality of tobacco leaves.