Effects Of Different K Levels On The Flue-cured Tabacco Yield And Quality

This study is mainly about the effect of different K levels on the flue-cured tobacco "K326" characteristics in different development stages with the same levels of Nitrogen and Phosphorus, i.e. agronomic characteristics, economic characteristics, main chemistry component, symptom lacked Kalium and condition infected climate speckles. The main results are as follows: The results show that the speed of the tobacco growth slow down significantly at the former and middle stage when the K level was above 180kg.hm-2. On the contrary, the height of case-hardened tobacco improved markedly. When the K level was above 135kg.hm-2, the stems perimeter, maximal leaf area and leaf area index come to super significance level contrasted to CK. It was suggested that the treatment 4 was superior to the other treatments in yield and production value, i.e. K level was 180kg.hm-2. Treatment 5 took the first place in average price and proportion of middle and prime tobacco leaf, i.e. K level was 225kg.hm-2. There are very significance level between the two treatments and CK in yield, average price and production value. The results show that as improved K level, the total sugar, k20, ratio of sugar and nicotine, ritio of sugar and protein, ratio of K and Cl in tobacco leaf increased. On the contrary, nicotine, total N, protein and Cl ion decreased. The symptom of tobacco lacked K alleviated when increased K level. As the results show that the climate speckles index decreased when improved the K level.