Effects of Application Amount of Bio-organic Fertilizer on Agronomic Trait and Photosynthetic Characteristics of Polygonatum cyrtonema
This study was conducted to investigate the demand of biological organic fertilizer for Polygonatum cyrtonema during cultivation.Four treatments were set up,with 100,125,150,and 175 g/plant of bio-logical organic fertilizer being applied as base fertilizer,respectively.After the seedlings emerge in April and replanting in November each year,75,100,125 and 150 g/plant of bio-organic fertilizer were applied respectively.Three years later,gas exchange parameters,chlorophyll fluorescence parameters,photosynthetic pigment content and morphological characteristics of P.cyrtonema in different treatment groups were measured.The results showed that the daily changes of net photosynthetic rate,transpiration rate and stomatal conductance of P.cyrtonema showed a"bimodal"curve,and photosynthesis was mainly limited by stomatal factors.The average daily net photosynthetic rate showed:100 g group＞75 g group＞125 g group＞150 g group.The chlorophyl l fluorescence parameter values ΦPS Ⅱ,ETR,Fv/Fm,Fv/Fo,qP and qN were all the highest in the 100 g group.The contents of chlorophyll a,chlorophyll b and carotenoids in the 100 g group were higher than those in the other three groups.Specific leaf weight and tuber dry weight were also highest in the 100 g group.P.cyrtonema do not tolerate high doses of fertilizers.It is recommended that planting P.cyrtonema can be applied with base fertilizer 125 g/plant,and follow-up fertilizer 100 g/plant.
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