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PROMOTION OF LATERAL ROOT GROWTH AND LEAF QUALITY OF FLUE-CURED TOBACCO BY THE COMBINED APPLICATION OF HUMIC ACIDS AND NPK CHEMICAL FERTILIZERS

Published online by Cambridge University Press:  14 March 2016

HONG SHEN*
Affiliation:
Laboratory of Root Layer Control, College of Agriculture, South China Agricultural University, 510642, Guangzhou, China
JUN ZHANG SHEN
Affiliation:
Laboratory of Root Layer Control, College of Agriculture, South China Agricultural University, 510642, Guangzhou, China
YUE LI
Affiliation:
Laboratory of Root Layer Control, College of Agriculture, South China Agricultural University, 510642, Guangzhou, China
YONG LIN LAI
Affiliation:
Laboratory of Root Layer Control, College of Agriculture, South China Agricultural University, 510642, Guangzhou, China
ZHI HONG JIA
Affiliation:
China Tobacco Hunan Industrial Co. Ltd., 10007, Changsha, China
JIAN HUA YI*
Affiliation:
China Tobacco Hunan Industrial Co. Ltd., 10007, Changsha, China
*
§Corresponding author. Email: hshen@scau.edu.cn; yijh0516@hngytobacco.com
§Corresponding author. Email: hshen@scau.edu.cn; yijh0516@hngytobacco.com

Summary

In this study, the effects of HA combined with NPK fertilizer (HANPK) on root growth and leaf quality of tobacco plants were investigated in tobacco fields. Results indicated that the application of HA alone did not enhance the growth of tobacco obviously, while HANPK increased tobacco biomass by 36.9% and stimulated the growth of lateral roots significantly. The number of the second-order lateral roots was increased by 89.3% compared with the control. Furthermore, HANPK raised the ratio of root biomass in 0–20 cm soil layer over the whole soil layer and increased the proportion of fine roots over the total roots. Tobacco leaf yield, output value, and benefit of HANPK were 12.2%, 29.4% and 35.5% higher than those of the control, respectively. The above results suggest that the combined application of HA and NPK chemical fertilizer is an economical pattern for improving tobacco growth.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2016 

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