磷鉀配施對(duì)曬紅煙碳氮代謝和光合效率的影響

Effects of P and K Fertilizers on the Carbon and Nitrogen Metabolism and Photosynthetic Efficiency of Dark Sun-cured Tobacco

摘要: 采用盆栽試驗(yàn)研究了磷鉀配施對(duì)曬紅煙碳氮代謝和光合效率的影響,。結(jié)果表明,，在氮用量相同的情況下，磷鉀肥缺乏易導(dǎo)致硝酸還原酶（NR）活性,、轉(zhuǎn)化酶（INV）活性和葉綠素含量下降,。在旺長期以前，不施磷肥和磷肥缺乏的處理NR/INV比值較大,，不施磷鉀肥和磷鉀肥缺乏易導(dǎo)致Fv/Fo和Fv/Fm降低,，并且磷素缺乏的影響程度要大于鉀素缺乏的影響程度。在參試的5個(gè)處理中,，以施用純N 150 kg/hm2,，N:P2O5:K2O=1:2:2.5的肥料配比有利于煙株的碳氮代謝平衡。

Abstract: The effects of P and K fertilizers on the carbon and nitrogen metabolism and photosynthetic efficiency of dark sun-cured tobacco were studied with a pot experiment. The results showed that with equal N rate (150 kg N per hectare), the nitrate reductase (NR) activity, invertase (INV) activity, and chlorophyll contents of fresh leaves decreased without P or K fertilizer application. The NR/INV ratio was higher in case of no or low P application and the values of Fv/Fo and Fv/Fm decreased in either case of no or low P and K application. The effect of P deficiency was severer than K deficiency before fast growing stage. The application of N 150 kg/hm2 with N:P2O5:K2O=1:2:2.5 was in favor of the balance of carbon and nitrogen metabolism.