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| DOI：10.13522/j.cnki.ggps.20180225 |
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| Combining Use of Potassium Fertilizer and Manure to Improve Growth and Yield of Rain-fed Tobacco |
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TANG Hong, ZHANG Yangzhu, ZENG Zhangquan, WANG Jianwei, LI Xiangyang, LIU Lunpei, YAN Hongguang
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1. School of Life and Health Science, Kaili University, Kaili 556011, China; 2. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; 3. Hengshan Research Station of Forest Ecosystem, Hunan Academy of Forestry, Changsha 410004, China
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| Abstract: |
| 【Objective】 Plant growth relies on soil nutrients, and the objective of this paper is to study the efficacy of combining use of potassium fertilizer and manure to improve growth, yield and economic return of rainfed tobacco. 【Method】The variety of Yunyan 87 was used as the model. The experiment was conducted at a field plot in Qiandongnan prefecture, Guizhou province. We considered four potassium fertilizer levels: 0 kg/hm2 (K0), 120 kg/hm2 (K1), 240 kg/hm2 (K2) and 360 kg/hm2 (K3), each applied with 2 250 kg/hm2 of manure (rapeseed cake, M). The main agronomic traits, diseases, economic characters and yield of flue-cured tobacco were measured in each experiment. 【Result】 At mature stage, the agronomic characters (except internodal length) of the tobacco in K3 were significantly better than that in K0 (p<0.05), with plant height, maximum leaf area, leaf area, stem girth, internodal length and root volume increasing by 27.64%, 35.16%, 56.38%, 35.36%, 17.06% and 63.03%, respectively. K3 reduced red star disease, mosaic and black shank by 51.69%, 41.16% and 45.35%, respectively, compared to the control; and it also decreased disease index of red star disease, and increased yield, economic return, value and proportion of grade-A and grade-B tobacco leaves by 26.60%, 36.03%, 5.82% and 2.26%, respectively. 【Conclusion】 K3 was most effective in improving growth, economic return, disease resistance, as well as yield, compared to other treatments. |
| Key words: tobacco; potassium application rate; growth; yield; Rainfed |
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