Effect Of Fermented Soybean Cake On Development And Quality Of Flue-cured Tobacco

In the presenting study, fermented soybean cakes from specific strain were used to study the role ofdifferent application ratio of fermented soybean cake in the growth,development and quality of flue-curedtobacco. In field conditions,3treatments were set according to the ratio of fertilization: B1, conventionalfertilization （control group）; B2, the mixture of50%fermented soybean cake nitrogen and50%fertilizernitrogen; B3,100%pure fermented soybean cakes. The test was performed using plot experiment with3replicates. During the application of fermented soybean cakes with the3different ratios, the accumulation anddistribution of the above-ground dry matter, nitrogen， phosphorus, potassium and nicotine were investigated;the chemical composition of tobacco leaves was analyzed and industrial smoking verification was performed.The results are shown as below:1.At harvest, the accumulation of root dry matter was the highest in the B2, which increased by7.20%compared to in B1group; the accumulation of stem dry matter was the highest in B3, with148.38kg·hm^-2higher than in B1group; the accumulation of leaf dry matter in B3group was188.38kg·hm^-2more than B1group. It indicated that it is beneficial for the dry matter accumulation when the application ratio of fermentedsoybean cake is in the range of50-100%.2.The early-stage accumulation of nitrogen in roots in B3increased by10.95%compared to in B1group;the nitrogen accumulation in stems with treatment of B3was1.16kg·hm^-2higher than B1group, while was0.06kg·hm^-2lower in B2than in B1group; the nitrogen accumulation in leaves was9.05kg·hm^-2higher in B3than in B1group, yet was1.45kg·hm^-2less in B2compared to in B1group. It indicated that the distribution ofnitrogen in different organs of flue-cured tobacco does not significantly change when the application ratio offermented soybean cake is in the range of50-100%.3.The accumulation of nicotine in stems was2.58kg·hm^-2higher in B3than in B1group, while was only0.35kg hm^-2higher in B2than in B1group; the nicotine accumulation in leaves was25.11kg hm^-2higher inB3compared to B1group， but in B2, it was only2.06kg hm^-2higher than B1group, which demonstratednon-observed significant difference. It can be concluded that there is no significant increase of nicotine indifferent organs of flue-cured tobacco when the application ratio of fermented soybean cake is around50%,however, the accumulation increased significantly when the ratio was up to100%.4.At harvest, the phosphorus accumulation in B3was only3.79kg hm^-2higher than in B1group, and itwas only1.31kg hm^-2higher in B2compared to in B1group, and no significant difference was observed,which indicated that the distribution of phosphorus in different organs of flue-cured tobacco does notsignificantly changed when the application ratio of fermented soybean cake is in the range of50-100%.5.The potassium accumulation at harvest in B3was48.9kg hm^-2higher than in B1group, but was9.0kg hm^-2higher in B1group than in B2. It indicated that there is no significant change of phosphorusaccumulation in flue-cured tobacco when the application ratio of fermented soybean cake is around50%,however, the accumulation increased significantly when the ratio was up to100%.6.The application of fermented soybean cake could remarkably increase the yield of tobacco, amongwhich， the yield was comparatively the highest when the cake fertilizer was100%. However, the proportion of superior tobacco was4.81%less than using50%cake fertilizer, thus result in the final output valuedecreased by351.15yuan compared to using50%cake fertilizer. It can be concluded that it is conductive tothe improvement of flue-cured tobacco quality when the application ratio of fermented soybean cake was inthe range of50-100%.