The axillary buds of stevia (Stevia rebaudiana Bertoni) often remain dormant for a long time and sometimes
remain dormant permanently until the plants enter into the reproductive stage. The present study was
conducted to ascertain whether decapitation and foliar fertilization enhance the productivity and quality
of stevia through breaking the apical dominance and increasing physiological activities. Ten treatment
combinations comprising two cultural operations (non-decapitation and decapitation) and five foliar
spray treatments (water spray control, KNO3 @ 5.0 g L−1, Ca(NO3)2 @ 4.06 g L−1, CuSO4·5H2O 2.0 g L−1 and
(NH4)6Mo7O24 @ 1.0 g L−1) were applied. The decapitation of apical buds of stevia increased the branches
and increased dry leaf yield by 13 and 17% compared with non-decapitation during 2010 and 2011,
respectively, without affecting quality. Foliar application of nutrient solutions also exerted a considerable
effect on growth parameters, yield attributes and chlorophyll content, and significantly (P = 0.05) higher
dry leaf yield ranging from 8 to 26% over the control. Among the foliar spray treatments, KNO3 @ 5.0 g L−1
and Ca (NO3)2 4.06 g L−1 were found most effective in dry leaf yield. Thus, the decapitation of apical buds
and foliar application of KNO3 and Ca (NO3)2 could enhance the productivity of stevia through improving
the growth of axillary buds and physiological activities
The axillary buds of stevia (Stevia rebaudiana Bertoni) often remain dormant for a long time and sometimesremain dormant permanently until the plants enter into the reproductive stage. The present study wasconducted to ascertain whether decapitation and foliar fertilization enhance the productivity and qualityof stevia through breaking the apical dominance and increasing physiological activities. Ten treatmentcombinations comprising two cultural operations (non-decapitation and decapitation) and five foliarspray treatments (water spray control, KNO3 @ 5.0 g L−1, Ca(NO3)2 @ 4.06 g L−1, CuSO4·5H2O 2.0 g L−1 and(NH4)6Mo7O24 @ 1.0 g L−1) were applied. The decapitation of apical buds of stevia increased the branchesand increased dry leaf yield by 13 and 17% compared with non-decapitation during 2010 and 2011,respectively, without affecting quality. Foliar application of nutrient solutions also exerted a considerableeffect on growth parameters, yield attributes and chlorophyll content, and significantly (P = 0.05) higherdry leaf yield ranging from 8 to 26% over the control. Among the foliar spray treatments, KNO3 @ 5.0 g L−1and Ca (NO3)2 4.06 g L−1 were found most effective in dry leaf yield. Thus, the decapitation of apical budsand foliar application of KNO3 and Ca (NO3)2 could enhance the productivity of stevia through improvingthe growth of axillary buds and physiological activities
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