Study On The High-yield Cultivation Model Of New Hybrid Rapeseed "Zhong Shuang 11" In Central Ecoregion Of Yangtze

In this study we investigated the effect of nitrogen status and plant density on photosynthetic characteristics of gas exchange parameters,chlorophyll fluorescence parameters, yield and quality of winter oilseed rape(Brassica napus L.zhongshuang 11), The result was showed as follows.1. the yield of winter oilseed rape was significantly affected by nitrogen status and plant density.the highest yield was obtained from the treatment (N3D4:209.25 kg N/hm2, 525000 plants/hm2). the mathematical model of nitrogen and planting density between yield was establishmented: y=2006.67+677.84χ1+194.84χ2-371.09χ12-155.27χ22+105.34χ1χ2, When nitrogen is 307.94kg/hm2, density of 522200 plants/hm2 obtained when the maximum yield 2760.54kg/hm2.2. Rape rape plants of different treatments in critical growth stages (seedling, moss bud stage, flowering, poding) net photosynthetic rate and gas exchange parameters and chlorophyll fluorescence parameters were significant and very significant difference. One N3D4 treatment significantly improved the net photosynthetic rate and water use efficiency of function leaves and pods of plant, and remained high stomatal conductance, intercellular CO2 concentration and a lower transpiration rate throughout the growth period, and the yield is higher. the actual quantum yield PSⅡ(EQY), photochemical quenching (qP) and non-photochemical quenching (NPQ), electron transport rate (ETR) of different treatments are quite different, N3D4 processing antenna pigment light absorption and electron transport rate better than other treatments, in the conversion of light energy to take advantage of the use, its EQY, qP, ETR value is higher, NPQ low. Visible, N3D4 processing to obtain high yield of leaves and the pericarp light use efficiency and higher electron transport chain efficiency and other physiological factors.3. Oil concentrations of different treatments was influenced by nitrogen more than planting density, there was significant difference of oil concentrations between treatments. oil concentrations decreased with the increasingof nitrogen, oil concentrations increase with the increasing of planting density in first, later decrease. The highest oil concentrations in which N1D4 reduced with the highest rate of oil 50.39%, followed by N1D1processing, reach 50.00%.4 Effective pods per plant and per pod between treatments quite different, but no significant difference in grain weight, pod number per plant with an effective amount of the increase of nitrogen, with the increase of planting density decreased; with increased nitrogen application increased first then decreased with the increase of planting density decreased first after an upward trend; grain weight increased with increasing nitrogen, with the increase of planting density decreased first and then increased Trend.