Effects Of Different Potassium Application Rate And Different Potassium Fertilization-Method On The Yield And Quality Of Flue-Cured Tobacco

The factors of potassium application rate(PAR) and potassiumfertilization-method (PFM) were designed in the experiment in 2005. Effectsof PAR, PFM and their interaction on agronomic characteristics, physiology,dry matter, potassium contents in plants and soil, yield and quality werestudied. The results are as follow:1 FOR AGRONOMIC CHARACTERISTICSThe plant heights, stem diameters, leaf lengths and widths,and leafamount tended to enhance as PAR increasing; difference between K2 (or K3)and K1 was significant at 0.05 (or 0.01) level. PFM had effects on plantheights, stem diameters, leaf lengths and widths,and Leaf amount, too; F2 andF4 were higher F3 signifying at 0.05 or 0.01 level.2 FOR PHYSIOLOGICALThe root, NR and Inv. activities were enhanced and the leaf ability ofcomposing chlorophyll was increasing at the same phase of the growingprocess by increasing PAR. The difference of each index between K2(or K3)and K1 was significant at 0.05 or 0.01 level. PFM had effects on root, NR, Inv.activity and chlorophyll content. The differences between F2 (or F4) and F3was significant at 0.01 level.3 FOR DRY MATTER ACCUMULATION OF PLANTWith the increasing of PAR, the dry matter of root,stem and leaf tended to increase; difference between K2 (or K3) and K1 was significant at 0.05 (or0.01) level. The effects of PFM on dry matter in root appeared atpro-phase(30d); F4 was higher than F3 signifying at 0.01 level. PFM alsoaffected dry matter in leaf(60d), F3 was lower than F1,F2 and F4, andsignifcant at 0.01 level.4 FOR POTASSIUM ACCUMULATION OF PLANTThe potassium contents in root and leaf were enhanced as the increasingof PAR; K1 was lower than K2 and K3, and significant at 0.01 level. Theeffects of PFM on potassium contents in root and leaf, tended to beF2(F4)＞F1＞F3; difference between F3 and F2 (or F4) was significant at 0.01level. But the effect of PFM on potassium contents in stem wasF3＞F2＞F4＞F1; differences between F1 and F2,F3,F4 were significant at0.05(or 0.01) level.5 FOR POTASSIUM IN THE SOILWith the increasing of PAR, the readily-available potassium,slow-released potassium and total potassium were enhanced in soil. Theinfluences of PFM and interaction on potassium in the soil were notdisciplinary.6 FOR CHEMICAL ELEMENTWith the increasing of PAR, contents of nicotine, total nitrogen, totalsugar, reduce sugar and potassium content in the leaves were enhanced,showing as K3＞K2＞K1;the differenc was significant at 0.01 level. Theeffects of PFM on nicotine, total nitrogen, total sugar, reduce sugar were notdisciplinary. The effects of PFM on total potassium in leaves was F4＞F2＞F1＞F3;the differenes between F4(F2) and F3 was significant at 0.01 level.7 FOR ECONOMICAL CHARACTERISTICSThe effect of PAR on yield was K3＞K2＞K1;the differences betweenK1 and K2, K3 were significant at 0.05 level. PFM affected yield showing asF4＞F3,and difference was signifcant at 0.01 level. The higtest yield oftreatment was K2-F4.The proportion of midle and high quality was enhanced as PAR increased;the effect showed as K3＞K2＞K1; the differences between each twolevels were significant at 0.01 level. The effect of PFM on proportion ofmideand high quality was F2＞F4＞F1＞F3;the differences between F2(or F4)andF3 were significant at 0.01 level. The max treatment of interaction betweenrate and method was K3-F4.The results showed that the most economical and effective treatment wasK2-F2.