Growth and Physiological Responses of Potted Peony to Nitrogen Fertilizer at Budding Stage
In order to clarify the effect of nitrogen(N)fertilizer on peony during budding stage and de-termine optimum rate of N fertilizer,five N levels(0,0.75,1.50,2.25,3.00 g per plant)were set and their effects on growth and physiological characteristics of pony were analyzed in the pot experiment.The results showed that the application of N fertilizer at budding stage significantly affected plant growth,N absorption and photosynthetic characteristics,but had no significant effects on the content and proportion of chlorophyll and its components in functional leaves.Plant height,stem diameter and aboveground dry matter accumulation in-creased firstly and then decreased with increasing N application amount.The underground dry matter accumu-lation,root length,and root-shoot ratio increased under low N(0.75 g per plant)level compared with no N application.The flower diameter increased significantly,flowering period was prolonged by 2 to 3 days,and the beginning of flowering time was advanced by 1 to 2 days at N application rates of 0.75～1.50 g per plant.The net photosynthetic rate was the highest,the aboveground N concentration and N uptake increased signifi-cantly,and the aboveground N allocation was enhanced when the N application rate was 2.25 g per plant.The growth status of peony was comprehensively evaluated using membership function method,which indicated that the optimal N application rate synergistic between vegetative growth and reproductive growth was 1.56 g per plant.In summary,appropriate application of N fertilizer at budding stage of peony could improve the photo-synthetic efficiency of leaves,and promote and coordinate the growth of aboveground parts,so it be worth ap-plying as a management strategy in peony production.
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