Effects of Mulching Method and Potassium Rate on the Growth, Chlorophyll Content and Economic Characters of Flue-cured Tobacco

MAO Jiawei; ZHAI Wenhui; SUN Dawei; ZHANG Xiang; YANG Lijun; LI Guoping; GUO Chuanbin

doi:10.15933/j.cnki.1004-3268.2015.03.009

Abstract：In order to determine the suitable mulching method and potassium rate in tobacco planting region of southern Henan,split-plot experiment was carried out to study the effects of mulching method and potassium rate on the growth,SPAD value and economic characters of flue-cured tobacco. The results showed that potassium application and mulching could promote the agronomic traits. The film mulching followed by straw mulching method got the highest plant height,stem girth and leaf area among the three different mulching methods. The agronomic characters of high potassium rate treatment(225 kg/ha) were best among the three different potassium application rates. The SPAD value of tobacco leaf increased firstly and then decreased in whole growth period. Potassium application and mulching could significantly improve the SPAD value in the early stage and promote leaves maturity in later stage. Different mulching treatments were compared,and the order of tobacco yield,output value and high grade leaf proportion all showed as follows:film mulching followed by straw mulching>straw mulching>non-mulching. Different potassium rates were compared, and the order of economic traits indicators was:high potassium rate (337. 5 kg/ha) >conventional potassium rate (225 kg/ha) >no potassium fertilizer (0 kg/ha). The combination treatment (film mulching followed by straw mulching + potassium rate of 337. 5 kg/ha) was best and the yield,output value and high grade leaf proportion were 2 190 kg/ha,37 681 RMB/ha and 32. 13%,respectively. Compared comprehensively,the cultivation method of film mulching followed by straw mulching and the potassium rate at 225—337 . 5 kg/ha was suitable in tobacco-growing region in south of Henan.