Study On Growth Model & Construction Of The Expert System Of Culture Management For Muskmelon In Greenhouse

It is a core technology of greenhouse environment and crop growth and development precise control and quantitative management. Muskmelon is a main variety in our country greenhouse, but because environment control and crop growth management is low, its unit area yield is only 1/4-1/2 than that of developed country. It has high yield and grade potential. Therefore it is important to predict precisely muskmelon growth and yield, greenhouse environment and crop growth optimize management, and improve greenhouse effect, etc. that expert system of culture management for muskmelon in greenhouse was developed.According to photosynthesis production, dry matter accumulation and parttitioning model of vegetable crop in greenhouse, especially melon vegetable, three varieties and four sowing data experiment were designed, the data of physiology configuration, environment and dry matter in muskmelon growth were collected, and this data was analyzed to develop and validate model. Main researches and results were following:1. The development stage simulation model of muskmelon in greenhouse based GDD The development stages of muskmelon in greenhouse were partitioned and growthsimulation model of muskmelon in greenhouse was developed according to invariance of effective accumulated temperature and plant experiment in many years. The parameter of effective accumulated temperature in different development stages were quantified and different development stages were predicted systemic. Its development stages contained seed stage, seedling stage, vine stretch stage, bloom and fruit stage, fruit developing stage and fruit mature stage, which GDD values are 574.3℃-d. 391.8℃ 113.8℃ 441.8℃-d 453.9℃-d separately. The result of simulation model test showed that this model was of high accuracy, more mechanism, and practicability.2. Photosynthesis production, dry matter accumulation and parttitioning model (1). Photosynthesis production dynamic modelSingle leaf photosynthesis model: FG=PLMX × [1-EXP (-ε× PAR/PLMX) ], (ε=0.48 kg CO₂ hm^-2h^-1/ (Jm^-2s^-1), PLMX=18kg CO₂hm^-2h^-1)Canopy photosynthesis model: DTGA= (∑ (TFG[j] × WT[j])) × DL (j=l, 2,3), thereinto, DTGA is single leaf photosynthesis rate integral to leaf area and day length.(2). Dry matter accumulation modelRespiration of maintain model: RM=R_m (T_o) × FDTGA × Q₁0^Tmean-To/10 FDTGA means total daily colony assimilation(kg CO₂ hm^-2 d^-1), T_o=25℃, Q₁0=2; T_mean means daily mean temperature ; R_m (T_o) =0.015 (gCO₂/gCO₂) [14] Respiration of growth model: RG=R_g × FDTGA, R_g=0.39 (gCO₂/gCO₂), means total daily colony assimilation (kg CO₂ hm^-2 d^-1)Respiration of photosynthesis model: RP=FDTGA × R_p (To) × Q₁0(Tday-To)/10, R_p (T_o) =0.33 (gCO₂/gCO₂)Colony dry matter accumulation model: net assimilation of colony dry matter model: PND= FDTGA- RM- RG; Colony dry matter accumulation model :TW=INTGRL(TW₀,TDRW), thereinto, TDRW= ξ× PND/ (1-0.05), ξ=0.682, TW₀ means sowing seed weight.(3). Dry matter parttitoning modelThe dry matter parttitioning model of muskmelon in greenhouse was developed according to partitioning index theory,, It includes the following equations:Aerial part: PIS=0. 98/(1+ 6.989 ×EXP (-0. 0000044× GDD^2)),Leaf: PILVG=0. 65/(1+0. 036 × exp(-3. 610+0. 0039 × GDD)),Stem: PISP=0. 5/(1+0. 0029 × EXP(15. 3+0. 00019 × GDD-0. 000007 × GDD^2)),Fruit: PIST=1-PILVG-PISP.(4) . The different organs growth dynamic models of muskmelon in greenhouse:Muskmelon stem length dynamic model to growing degree days:Y₁-stem=0.0001x²-0.1404x+49.702,Relationship of stem fresh weight and dry weight:Y_w-stem =0.0885xRelationship of leaf fresh weight and dry weight:Y_w-leaf=0.1065xRelationship of fruit weight and dry weight:Y_fruit = 0.0815xRelationship of fruit diameter, length and fruit fresh weight:Relationship of root fresh weight and dry weight: Y_root=0.1248x(5) Leaf area dynamic model: LA=LW×SLA, SLA is 75. 76, 72.67, 74.51, 75.88, 76. 40 m²/Kg separately indifferent growth stages thereinto, LA means leaf area, LW means l...