| Facilities agriculture is the direction of agricultural development in our country, at the same time, the most critical technologies is environmental control facilities in agricultural development Light quality ingredients is an important part of the light environment facilities, plants selective absorption spectrum,different light quality components in plant morphogenesis, photosynthesis and regulation of metabolism are not the same.In recent years, the use of light quality conditioning crop growth and quality of the research has drawn increasing attention to domestic and foreign scholars,Light quality regulation has energy saving, environmental protection and many other advantages, also comply with the facilities of agriculture, "high quality, efficient, ecological and safe"direction of development. Sweet pepper is an important vegetable in hole the world,because of high yield, good quality and high economic value.At present, the different light quality ingredients on growth of sweet pepper, yield, quality of research at home and abroad are not many.This study is based pepper response to light quality, design and color film processing in different experiments。Detailed study of red, yellow, blue, green, purple membrane treatment on photosynthetic characteristics of sweet pepper, growth, yield and quality, while building dry matter production and distribution model for regulation of greenhouse sweet pepper light quality to provide a scientific basis.(1) The light compensation point and light saturation point of the leaves of pimentos treated by different light qualities fall into the ranges of 45-60μmol·m-2s-1 and 1000-1200μmol·m-2s-1 respectively. The maximum photosynthetic rate (Pg.max) of a singe leaf treated by red film is the highest, i.e.8.4μmol·m-2s-1, while the maximum photosynthetic rate of a singe leaf treated by violet light is the lowest, i.e.2.89μmol·m-2s-1 only. When the leaves of pimentos are treated by red film and colourless film(CK), the CO2 saturation point obviously surpasses that by violet film and yellow film, and all the CO2 compensation points stay at about 100μmol·mol·-1. The content of chlorophyll (spad) treated by colourless film (CK) is the highest, while the content treated by green film is the lowest. The diurnal fluctuations of net photosynthetic rate, stomatal conductance and transpiration rate of the leaves treated by different color films are all of single-peak type. Except blue film, the intercellular CO2 concentration diurnal variation curve treated by other films is W-type. If the leaf is treated by red film, then the daily average value of water utilization efficiency will be the highest; if it is treated by violet film, the value shall be the lowest. If the leaf is treated by violet film, then the stomatal limitation value will be the highest; if it is treated by red film, the value shall be the lowest. The treating of red film and yellow film will help the photosynthesis of pimentos forward while the treating of violet film has an outstanding inhibitive effect.(2) During the seedling stage, the highest stomatal conductance between the two breeds is that treated by white film. The lowest values of Sujiao13 and CX9 were taken respectively by violet film and red film. The daily variation of stomatal conductance treated by yellow film, red film and CK is single-peak type, while the daily variation treated by other films is double-peak type. During the fruiting period, the highest value of Sujiao13 is taken by red film while the lowest value is taken by yellow film. Except green film, the daily variations treated by other films are all single-peak type. During the seedling and fruiting stages, the stomatal conductance values of Sujiao13 treated by other films are all higher than that of CX9 except that which is treated by yellow film. During the seedling stage, the higher transpiration rate between the two breeds is taken by reference one while the lower is taken by green film treating. During the fruiting period, the higher value between the two breeds is taken red film treating while the lower value is taken by green film treating. During the testing, the influence brought to the stomatal conductance of pimentos by temperature won't be obvious. The stronger the radiation is, the bigger the stomatal conductance is and the higher the transpiration rate is.(3) The maximum(minimum) total dry weight per unit area plant, the dry matter partitioning index (DMPI) and yield of per unit area fruit were treated by red(purple)film, the maximum(minimum) stem matter partitioning index was treated by blue(red) film. The plants treated by blue, green and purple film had higher leaf DMPI than others. Different light qualities had no significant effect on the shoot DMPI. The effect of different light qualities treatments on sweet pepper leaf area index and the maximum leaf area index at harvest showed that:different light qualities treatments on sweet pepper leaf area index and days after transplanting accorded with the logistic model better:LAI=β×μ×LAImax/(1+Exp(aO-a1×i))LAI is the leaf area index of NO. i day after transplanting; LAImax is the maximum leaf area index of reference sweet pepper during harvest period, N is plant density (plants·m-2).βis variety parameter of sweet pepper leaf area,μis different light qualities effect parameter. The Study showed that total dry weight per unit area and the effect of crown layer temperature and light intercepted after transplanting had accorded with exponential equation:Sujiao3:Wt=757.2/(1+exp(3.363-0.02938APTE))CX9:Wt=581.84/(1+exp(3.0722-0.0305APTE).Wt is total dry weight of per unit area (g·m-2); PARi represents the accumulated APTE is theeffect accumulation value of crown layer temperature and light intercepted after transplantingThe relation between the dry matter partitioning index and the effect of crown layer temperatureand light intercepted after transplanting of the above ground parts, leaves and fruits. The drymatter partitioning model of the aboveground parts:The dry matter partitioning model of leaves:The dry matter partitioning model of fruits:PISH, PIL and PIF are the dry matter partitioning indexes of the aboveground parts, leaves and fruits respectively, a1, a2 and a3 are model parameters.(4) With the effect of crown layer temperature and light intercepted increasing, the fruit harvest index of different treatments increased.The fruit harvest index of red and yellow film treatment was higher than any other treatments. The percentage of qualified products treated by purple film was the minimum. The yield of sweet pepper treated by red film was the maximum, also the shoulder diameter, length, single weight of fruit and pericarp thickness were significantly higher than CK and any other treatments, and treated by purple film was the lowest. Yield model using independent data showed that, the decisive coefficients of model to simulation and observation value of Sujiaol3 and CX9 fruit harvest dry matter based on 1:1 line were 0.894 and 0.872, RMSE were 13.47 and 12.15 g·m-2 respectively. Red film and yellow film treatment were beneficial to sweet pepper fruit dry matter accumulation, and promoted yield formation and quality improvement, while the treatments of purple film and blue film had significant inhibitory effect.
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