| 摘要: |
| 为了探讨根区施用钾肥对黄淮烟区石灰土烤烟产量和钾素吸收利用的影响，采用田间试验，研究根区枸溶性钾肥与硫酸钾配施对烟叶产量、钾含量以及钾素吸收利用的影响。试验共设9个处理，分别为CK、CP1、CP2、WP1、WP2、CW1-50%、CW2-50%、CW1-75%与CW2-75%（CK表示对照，CP表示只施用枸溶性钾肥，WP表示只施用硫酸钾，CW表示枸溶性钾肥与硫酸钾配施；数字1、2表示施用量分别为225、300 kg/hm2，百分数表示硫酸钾的配施比例）。结果表明，烟叶钾含量随生育期推进呈下降趋势，不同施肥处理各时期烟叶钾含量均高于CK；不同施肥处理下土壤钾素在垂直和水平方向上迁移距离较小，根区钾肥施用可直接有效的增加根区土壤速效钾含量；施钾（K2O）300 kg/hm2与225 kg/hm2相比，可显著提高烟叶钾含量和钾肥利用效率（P<005）；CW2-75%处理下烟叶钾含量、土壤速效钾含量和钾肥利用率最高，而CW2-50%处理下烟叶产量最高。综上所述，根区施用含75%硫酸钾的枸溶性钾肥300 kg/hm2（CW2-75%处理）可有效改善黄淮烟区石灰土钾素养分，提高该区烤烟产量、钾含量与钾肥利用效率，达到优质高产。 |
| 关键词: 烤烟 钾含量 根区施肥 枸溶性钾肥 硫酸钾 |
| DOI：10.11838/sfsc.20180511 |
| 分类号: |
| 基金项目:安徽省烟草公司科技项目（20130551003）；安徽省烟草公司科技重点项目（20150551009）；江苏高校优势学科建设工程（PAPD）。 |
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| Effects of root zone potassium fertilizer on the yield,potassium concentration and potassium uptake of flue cured tobacco |
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| Abstract: |
| In order to investigate the effects of root zone potassium fertilizer on the yield and potassium uptake of flue cured tobacco in calcareous soil of Huanghuai tobacco region,the field experiment was conducted to study the effects of citrate acid soluble potassium fertilizer and potash fertilizer on the yield,potassium concentration and potassium uptake of flue cured tobacco.A total of nine treatments were conducted for the tests,namely CK,CP1,CP2,WP1,WP2,CW1 50%,CW2 50%,CW1 75% and CW2 75%(CK indicates control,CP indicates that only citrate acid soluble potassium fertilizer is applied,WP indicates that only potash fertilizer is applied,CW indicates that citrate acid soluble potassium fertilizer in combination with potash fertilizer is applied,and figures 1 and 2 indicate that application rates are 225 kg/hm2 and 300 kg/hm2 respectively,percentage indicates the ratio of potash fertilizer applied).The results showed that the potassium content of tobacco leaves showed a downward trend with the growth period,and the potassium content of tobacco leaves in different fertilizer treatments was higher than that of CK.Under different fertilization treatments,the soil potassium transport distance in the vertical and horizontal directions was relatively small.Root zone potassium fertilization directly and effectively increased the content of available potassium in the root zone of tobacco.Compared with 225 kg/hm2,the application of potassium(K2O)at the rate of 300 kg/hm2 significantly increased the potassium content of the leaf and potassium fertilizer utilization efficiency(P<005).The content of potassium,the content of soil available potassium and the utilization rate of potassium fertilizer were the highest under CW2 75% treatment,while the yield of tobacco leaves under the treatment of CW2 50% was the highest.In summary,applying citrate acid soluble potassium fertilizer containing 75% potash fertilizer at the rate of 300 kg/hm2(CW2 75%)in the tobacco root zone can effectively improve the potassium nutrients,increase the yield,potassium content and potash fertilizer utilization efficiency of tobacco,and achieve high quality and high yield in calcareous soil of Huanghuai tobacco region. |
| Key words: flue cured tobacco potassium content root zone fertilization citrate acid soluble potassium fertilizer potash fertilizer |
