Effects of Different Nitrogen Treatments on Growth,Photosynthetic Characteristics and Yield of Cut Flower Roses
In order to select suitable nitrogen application rate,effects of different nitrogen application rateon growth,yield and photosynthetic characteristics of cut flower rose in Lanzhou New District were studied.Using Roselle rose as experimental material,5 nitrogen application rates(0,600,900,1 200,1 500 mg/L)were set to determine the effects of different nitrogen concentrations on growth,photosynthetic characteristics and yield of cut flower roses.The results showed that the plant height and pedicle length increased with the increase of nitrogen concentration.Stem diameter,leaf width,internode number,flower transverse diameter,flower longitudinal diameter,contents of chlorophyll a(Chl a),chlorophyll b(Chl b),chlorophyll a+b(Chl a+b),net photosynthetic rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)all increased first and then decreased.Intercellular CO2 concentration(Ci)decreased first and then increased.Compared with no nitrogen application,the increase and decrease of each index were different under different nitrogen concentration treatment,it showed that nitrogen treatment had obvious concentration effect,and the effect was most obvious under 900 mg/L treatment in whichcontents of chlorophyll a(Chl a),chlorophyll b(Chl b),andchlorophyll a+b(Chl a+b)increased by 53.32%,37.98%,and 45.74%,respectively compared to the non-nitrogen control;the net photosynthetic rate of leaves(Pn)was 14.17 μmol/(m2·s),an increase of 73.47%compared to the non-nitrogen control;stomatal conductance(Gs)was 0.068 mol/(m2·s),an increase of 51.41%compared to the non-nitrogen control;transpiration rate(Tr)was 183.60 g/(m2·h),an increase of 40.49%compared to the non-nitrogen control;the intercellular CO2 concentration(Ci)of the leaves reached its lowest value at 619 μmol/mol,a decrease of 12.94%compared to the non-nitrogen control;the highest yield was 24 stems/m2,an increase of 33.33%compared to the non-nitrogen control.Therefore,the application of N at 900 mg/L can significantly improve the yield of fresh-cut rose,improve the quality of rose,and promote the photosynthetic capacity of Roselle,which is the best nitrogen application amount for fresh-cut Rosellerose in glass greenhouse.
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