ACTA AGRICULTURAE BOREALI-SINICA ›› 2019, Vol. 34 ›› Issue (2): 187-197. doi: 10.7668/hbnxb.201751060

Special Issue: Tobacco Soil fertilizer

• Environment·Plant Protection • Previous Articles     Next Articles

Effect of K Application Level on Biomass, K Absorption and Quality of Flue-cured Tobacco in Sand Mud Soil

ZHANG Shirong1, WANG Jun2, LIN Changhua3, DING Xiaodong1   

  1. 1. College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China;
    2. Nanxiong Tobacco Science Institute of Guangdong, Guangdong Tobacco Technology Center, Nanxiong 512400, China;
    3. Henry Fok School of Agricultural Science and Engineering, Shaoguan University, Shaoguan 512005, China
  • Received:2018-11-06 Published:2019-04-28

Abstract: Under the optimization of C/N with organic fertilizer and N fertilizer, a field experiment was carried out to study the effect of potassium and the ratio of basic/dressing fertilizer on biomass, potassium uptake, soil available potassium content and aroma quality of tobacco. Split-plot experiment design was adopted. The main treatment was 3 K level:K1 (120.0 kg/ha),K2 (240.0 kg/ha) and K3 (360.0 kg/ha);and the subsidiary treatment was the ratio of basic/dressing K fertilizer:S1(7:3),S2(5:5) and S3(3:7). The results showed that the biomass of tobacco leaves increased with the increase of potassium application, while it decreased with the increase of potassium dressing ratio in the same K level in the fast growth and mature period. Under the K2 and K3 level, the leaf potassium content was lower in the S1 treatment than in S2 and S3 treatments, indicating that the increase of K dressing percentage was conducive to the transfer of potassium ions from lower leaves to middle and upper leaves. With the increase of potassium application, the content of available and slowly available potassium in rhizosphere soil increased. Under K2 level, the available potassium of soil reached to maximum at fast growth and bud stages, and was lower in S3 treatment than in S1 and S2 treatments at mature stage. Under K3 level, the available potassium in rhizosphere soil had no significant difference among the four growth stages, in which that of S3 treatment > S1 treatment > S2 treatment. Compared with other treatments, the contents of total nitrogen, total nicotine and protein in tobacco leaves were significantly higher in S3 treatment under K2 level, and the ratio of sugar/alkali and ratio of nitrogen/alkali were improved. The neutral aroma components had no significant difference in upper leaves under K1 level, but it improved significantly in S3 treatment under K2 and K3 levels, especially for S3 treatment under the K2 level, in which the quality, quantity and concentration of aroma in tobacco leaves were the best. It was concluded that under the optimization conditions of organic fertilizer C/N, 240.0 kg/ha potassium fertilizer was recommended in the sand mud soil of Southern China, and the basic fertilizer was 72.0 kg/ha and the dressing one was 168.0 kg/ha (the ratio of base to dressing was 3:7), which could effectively improve the potassium content and quality of tobacco leaves.

Key words: Flue-cured tobacco, Potassium fertilizer, Sand mud field soil, The ratio of base to dressing, Potassium supply capacity, Quality index, Neutral aroma components

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Cite this article

ZHANG Shirong, WANG Jun, LIN Changhua, DING Xiaodong. Effect of K Application Level on Biomass, K Absorption and Quality of Flue-cured Tobacco in Sand Mud Soil[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(2): 187-197. doi: 10.7668/hbnxb.201751060.

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