Density and Reserved Leaf Number of Tobacco to be Replanted in Cold Waterlogged Paddy Field

To study the effects of density and reserved leaf number on the growth duration, agronomic character, yield and output value, the test was conducted on the density (Ai): (16665, 13875 and 11895 plants/hm2, respectively) and reserved leaf number (Bj): (26, 22 and 18 pieces, respectively) for planting tobacco in cold waterlogged paddy field. The results showed that: (1) the density has certain effect on the growth duration. The budding period of low density is 1.7-2 days earlier than high density; (2) In the mature period, correlative analysis showed that there was a significant positive correlation between density and plant height (r31 = 0.9992, p<0.01 and there were negative correlation between density and stem girth, total leaf number and maximum leaf area, but not reach significant level; (3) The results showed that there is a positive correlation between density and yield (r31 = 0.9318), but the highest output value was the one whose density was 925 plants/667 m2; (4) Correlative analysis showed that there is a significant positive correlation between reserved leaf number and yield and output value (r81 = 0.9985, p<0.01, r82 = 0.9851, p<0.05); (5) The first five leading yield is A1 B1, A2B1, A1B2, A1B 3, A2B2 The first five leading output value is A2B2, A2B1, A1 B1, A1B 3, A2B 3; (6) Analysis of output value and economic traits of tobacco result showed that the best combination of planting tobacco in cold waterlogged paddy field was 13875 plants/hm2 with 22 pieces/plant.