Substrate Film Production System For Greenhouse Muskmelon Based On Physiological Analysis And Growth Simulation

Muskmelon production developed fast in the past two decade in China, soilless culture also applied gradually as an exercisable technology to muskmelon aims to solve problems exists in conventional culture and enhance yield and quality as well. However, problems appeared in soilless culture which embarrass the application and popularize recent years, such as no feasible soilless culture system, high substrate dosage increasing cost, management is still difficult to user, low standardization and precision in operation, etc.Hereby, the thesis aims to research and develop new soilless culture system, study main relevant cultivation physiology, modelling main growth index, make muskmelon simulation model and management system for the culture system and integration all above into a new-style production system as a result.The main results were followed:1. A new-style system-Substrate Film Culture System (SFCS) was developed and was applied to muskmelon production. The substrate thickness was reduced to 6.5 cm and substrate dosage for per plant was reduced to 4.45 L with this system. Compare to bag system, SFCS get better results not only on growth and development, but also yield and quality. Furthermore, substrate and over fall position effect on growth and development were also studied and the optimal was got.2. Analysis and measurement system for crop canopy photosynthesis rate with climate chamber was established in the thesis, temperature and CO2 influence on photosynthesis rate was studied and the effect was determined primarily. The method that determine optimal greenhouse temperature management bases on canopy photosynthesis was discussed as well. 3. Effect of substrate water content during fruit expanding stage and amount whole cultivation period respectively on growth, yield and quality were studied, appropriate water content value which can be a reference to production was primarily choosed.4. The effect of fruit set number, set sequence as well as heat accumulation on muskmelon fruit weight and quality was also studied. The results indicated that one fruit per plant was propitious to get high commercial yield and especially better apparent fruit quality than more (two or three) fruits per plant. Fruit set and harvesting sequence as well as fruit set position influenced fruit weight and quality obviously. Heat accumulation was a main factor that determine muskmelon fruit fresh weight and the relation was almost positive linear, the relation was: FFW (Fruit fresh weight) = 0.0513Σtu (Accumulated thermal unit)– 385.01(r~2=0.997) and FFW=0.8678ΣT ( Accumulated temperature) - 156.82(r~2=0.980).5. Optimal formula for main growth indexes such as leaf number, leaf area and plant height was selected and determined. One model that exit in a tomato model TOMSIM (Tomato Simulator) was recomposed and used to 5 crops biomass simulation, the results indicated that the model can simulation nuskmelon biomass production well and also a fine simulation result was get for relative growth rate. A method for selecting suitable muskmelon cultivation period according to Shanghai historical climate data and modelling results was attempted as well.6. Management system for greenhouse muskmelon, mainly for substrate culture muskmelon was built and some real time results such as photosynthesis rate, fruit fresh weight, etc. can be attained which was beneficial for greenhouse and cultivation managements.