干旱和氮用量对烤烟干物质和矿质养分积累的影响

采用盆栽试验研究了干旱和氮用量对烤烟(Nicotiana tabacum L.)干物质积累和矿质养分含量的影响。结果表明,在烤烟的生长发育过程中,干旱胁迫严重影响烟株干物质积累和矿质养分含量,特别是K、Fe、Mn含量对干旱的反应更加敏感,而干旱胁迫不影响不同生育期烤烟矿质养分积累规律。随氮用量增加,烟株干物质积累量显著提高,但烤烟干物质积累对氮用量的反应遵循报酬递减律。在干旱胁迫下增施氮肥可以促进烟株对N、P、K、Mn、B的吸收和积累,降低烟株Ca、Mg、Fe、Cu、Zn含量,而水氮互作对于改善烤烟矿质营养,提高烟株干物质积累量具有显著促进作用。 

Effects of drought stress and nitrogen on dry matter accumulation and concentration of mineral elements in flue-cured tobacco

The effects of interaction between water and nitrogen on dry matter accumulation and concentration of mineral nutrients in flue\|cured tobacco (\%Nicotiana tabacum\% L.) plant were studied by pot experiment. The results showed that dry matter accumulation and content of mineral elements in the plant were severely affected by drought stress during growth and development of flue\|cured tobacco, and the responses of K,Fe, Mn concentration to drought stress were more sensitive, but the characteristics of mineral element accumulation in flue\|cured tobacco plant at different growing stages was not influenced by drought stress. The amount of dry matter accumulation and the content of N,P,K,Mn,B in tobacco plant increased, but the content of Ca,Mg,Fe,Cu,Zn decreased with the increasing rates of nitrogen under drought stress, while the effects of rates of nitrogen on dry matter and concentration of mineral elements in tobacco plant were more remarkable under sufficient irrigation conditions. It was also found that the response of dry matter accumulation to rates of nitrogen conformed to the Mitscherlich theory.