不同成熟度烟株根际土壤无机氮含量与叶片SPAD值及氮含量的相关性分析

采用田间调查与室内检测相结合的方法,对云南省玉溪市澄江县烤烟生产上封顶后10～12天的不同成熟度烟株进行分析研究.结果表明,烟株根际土壤无机氮含量直接影响烟株成熟度及叶片全氮含量,而土壤水解氮(有效氮)含量高低对其基本无影响;正常落黄烟株的根际土壤无机氮含量为52.4～58.8mg/kg,5叶位、10叶位、15叶位及2...

The Correlation Analysis of Inorganic N in Rhizosphere Soil and SPAD Value and N Content in Leaves of Tobacco Plants with Different Maturity

Using the method of field investigation and laboratory testing, the tobacco plants with different maturity were analyzed in Chengjiang County in Yuxi City of Yunnan Province, 10 to 12 days after the top of flue-cured tobacco was capped. The results showed that the content of inorganic N in rhizosphere soil directly affected the maturity of tobacco plants and the content of total N in leaves, while the content of hydrolyzed N (effective N) in soil had no effect on it. The content of inorganic N in the rhizosphere of normal mature tobacco plants was 52.4-58.8 mg/kg, and the SPAD value of leaves at 5, 10, 15 and 20 leaf-site was 30.6, 39.4, 46.8 and 50.8, respectively, and the total N content of the corresponding leaves was 1.301%, 1.380%, 1.491% and 1.648%, respectively. Before the initial period of leaf harvesting and curing, the SPAD values of leaves at different leaf positions of tobacco plants were significantly and positively correlated with the total N content, N:K ratio and inorganic N content in rhizosphere soil of tobacco plants. Therefore, using SPAD-502 Plus chlorophyll analyzer to measure the SPAD value of leaves at each leaf position could quickly estimate the content of inorganic N in rhizosphere soil of tobacco plants and the content of total N in leaves, so as to better judge the maturity of tobacco plants and take corresponding field management measures.