氮、磷、钾不同施肥水平对烤烟光合特性的影响

Effects of Different Levels of N,P,K Fertilizer Application on Photosynthetic Characteristics of Tobaoco

采用14种不同氮、磷、钾施肥配方,在自然光下测定烤烟叶片净光合速率、气孔导度等指标,研究不同氮、磷、钾施肥水平对烤烟叶片光合特性的影响。结果表明,14种施肥配方对烤烟植株的净光合速率、气孔导度、胞间CO2浓度、蒸腾速率、叶温有明显影响。N2P1K1(N 90 kg/hm2、P 45 kg/hm2、K 112.5kg/hm2)施肥水平烤烟叶片的净光合速率、气孔导度、蒸腾速率均最大,分别为14.145μmol/(m2·s)、0.817 mol/(m2·s)、12.573 mmol/(m2·s)。

Fourteen different application levels of N,P,K fertilizer were used to study effects of N,P,K on photosynthetic char-acteristics of tobaoco under natural light. The results showed that effects of different application levels N,P,K fertilizer on the photosynthetic rate, stomata conductance, intercellular CO2 concn, transpiration rate, and leaf temperature of tobaoco leaves were significantly different. The photosynthetic rate, stomata conductance, transpiration rate of tobaoco with N2P1K1 （N 90 kg/hm^2,P 45 kg/hm^2,K 112.5 kg/hm^2﹚were maximal which were 14.145μmol/（m^2？s﹚, 0.817 mol/（m^2？s﹚ and 12.573 mmol/（m^2？s﹚, respectively.