Growth And Physiological Effects Of Greenhouse Green Pepper With Pot Type CO₂ Automatic Fertilization

In the production of facility vegetables in the closed environment in autumn and winter,due to insufficient supply of CO2 concentration in the environmental system during the light period,the photosynthesis intensity of vegetable crops is reduced,and the accumulation of organic matter is insufficient,which leads to the decline in vegetable quality and poor economic benefits.The experiment studied the effects of three different concentrations of CO2 fertilization on the growth index,photosynthesis index,disease resistance,biomass accumulation and green pepper fruit yield,quality and output value of green pepper during pot growth under automatic CO2 fertilization.To explore the effect of pot-type automatic CO2 fertilization on the growth and production of green pepper.The main results are:1.The increase of CO2 in the facility environment can promote the growth of green pepper.The plant height,stem diameter,internode length,leaf length,leaf width,and leaf area of green pepper are significantly increased,among which the increased CO2 concentration of 1200±50?l·L-1 had the most obvious promoting effect on the growth index of green pepper.2.The increase of CO2 in the facility environment has a significant effect on promoting photosynthesis of green pepper.The net photo synthetic rate,instantaneous water use efficiency,intercellular CO2 concentration and SPAD value of functional leaves of green pepper are improved.The stomatal conductance and transpiration rate are decreased.The difference is most significant when the CO2 concentration is 1200±50?l·L-1.3.The increase of CO2 in the facility environment improves the resistance to powdery mildew of green pepper plants.Among them,the effect of increasing CO2 concentration of 900±50?l·L-1 is the best,which is 35.1%lower than CK;the effect of applying fertilizer concentration of 1200±50?l·L-1 is the most significant,which is 10.0%lower than CK.4.The increase of CO2 in the facility environment can increase the vitamin C content of green pepper fruit,but has no effect on the soluble sugar and soluble protein content.Among them,increased CO2 concentration of 1200±50?l·L-1has the most significant promoting effect on vitamin C content of green pepper fruits in autumn and winter,which increasing by 59.8%compared with CK.5.The increase of CO2 in facility environment promoted accumulation of organic matter in green pepper plants.During the whole growth period,when increase CO2 concentration is 1200±50?l·L-1,it has the most significant effect on dry and fresh weight of pepper plants.With the increase of CO2 concentration,the percentage of organic matter allocated to the stem is higher than that to the leaf.6.The increase of CO2 in the facility environment can increase the output of pepper in autumn and winter and improve economic benefits.The effect of increasing CO2 concentration to 1200±50?l·L-1 is the most significant Compared with CK,the first harvest yield increases by 27.6%and the output value increases by 7140.0 yuan/hm2.In summary,the facility environment can be automatically controlled and applied by tank-type CO2,which can achieve the purpose of increasing production and quality of green pepper in autumn and winter;Increasing the amount of CO2 green pepper growth increased,photosynthesis increased,disease resistance increased,yield increased,and fruit quality improved.Therefore,tank-type CO2 automatic control application technology is an effective way to supplement CO2 in a facility environment.The control process does not require manual labor,is simple to operate,and has the value of popularization and application.Within the scope of the experimental study,the suitable CO2 supply concentration of green pepper is 12000±50?l·L-1.