A Preliminary Study On Water Requirement Character Of Flued-cured Tobacco Of High-quality In Karst Mountain Area

We designed the pot and field experiments and studied the water requirement of flue-cured tobacco in karst mountain area . The results were as follows:(1)Soil moisture has obvious influenced on root volume of flued-cured tobacco. The soil is light degree dry at root growth stage ,The soil moisture is ample at rapid growth stage that benefit root growth of flued-cured tobacco.(2) soil moisture has obvious influenced on growth velocity of flued-cured tobacco. Soil moisture is ample ,the plant is flourishing. Rapid growth stage is water critical period of flued-cured tobacco .(3)The research expressed that soil moisture can prolong nourishment period 6. 9 days compared to CK, So it is important path that prolongs the nourishment period to moisture control.(4) Analysis results expressed that tobacco leaves chemical composition, as soil moisture is low, total nitrogen and the nicotine contents go up, but reducing sugar content, flue-cured tobacco mature period with 65%,75% moisture treatment ,all chemical components harmonized relatively .So the 65%~80% percent of soil moisture should be kept during the maturing stage.(5)The suitable soil moisture indexs to karst mountain flued-cured tobacco are 61. 6%, 79. 8%, 76. 7%(the root spreading stage, vigorous growing stage , the maturing stage).(6) The water requirement of flued-cured tobacco has the obvious period stage. it require little during root spreading stage , require much...