Effects of Nitrogen and Potassium Application Rates on Flue-cured Tobacco Growth and Nutrient Uptake in Southern Anhui Province

doi:10.7668/hbnxb.201751224

Abstract

Abstract: In order to set up the basic theory for rational fertilization technology of tobacco in Southern Anhui Province,we analyzed the changes of agronomic characters,dry matter accumulation,nutrient absorption and fertilizer use efficiency of flue-cured tobacco under different nitrogen and potassium fertilizer application rates. The result showed that high nitrogen fertilizer rate caused the increment of plant height,leaf number,leaf length and leaf width of tobacco at different positions. The dry matter accumulation in different organs and the ratio of shoot to root also increased with the increase of nitrogen application rate. The increase of nitrogen fertilizer rate also increased the nitrogen and potassium accumulation in roots,stems and leaves. The amount of nitrogen fertilizer was positively correlated with the whole plant nitrogen concentration,and had significantly positive correlation with the total nitrogen and potassium accumulation. With the increase of nitrogen fertilizer amount,the utilization rate of nitrogen fertilizer did not change significantly,but the agronomic efficiency and partial productivity of nitrogen fertilizer increased significantly. The increase of potassium fertilizer had no significant effect on the agronomic traits of flue-cured tobacco. High potassium fertilizer rate caused the increment of nitrogen concentration in roots,and potassium concentration in stems and leaves,but the dry matter accumulation and nutrition accumulation in different organs were not influenced by potassium fertilizer rate. The amount of potassium fertilizer was only positively correlated with the whole plant potassium concentration. The utilization rate of potassium fertilizer was relatively low among the treatments. Among the treatments with the lowest application rate of potassium fertilizer,the utilization rate of potassium fertilizer,the agronomic efficiency and partial productivity of potassium fertilizer were the highest. In the experiment,the dry matter accumulation and the nutrition accumulation in whole plant,and the nitrogen fertilizer use efficiency increased significantly with the increment of nitrogen application rate. Applying nitrogen fertilizer had obvious effect on the increase of yield. With the increase of potassium fertilizer,there was no significant change in dry matter accumulation and nutrient accumulation. According to the results of leaf potassium concentration and the potassium fertilizer use efficiency,the potassium application rate should be reduced in Southern Anhui Province.

Key words: Flue-cured tobacco, Nitrogen, Potassium, Growth and development, Fertilizer use efficiency, Nutrition accumulation

CLC Number:

S572
S143.3

ZHANG Shuo, SHEN Han, PEI Zhouyang, TANG Chaoqi, CHEN Youhong, ZHANG Jiguang, WANG Xiaolin, ZHANG Shuang, DING Xiaodong, YAN Huifeng. Effects of Nitrogen and Potassium Application Rates on Flue-cured Tobacco Growth and Nutrient Uptake in Southern Anhui Province[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(4): 167-173. doi: 10.7668/hbnxb.201751224.

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