| The rapid development of facility agriculture in the northern region has solved the problem of insufficient supply of agricultural products in the cold winter,and greatly reduced the pressure of transportation of southern vegetables to the north.However,the design,construction and planting techniques of northern greenhouses are not standardized,and farmers are lacking in information and knowledge.Due to factors such as restrictions,it is often used to build greenhouses by experiences or to copy the facilities structure or planting patterns of high-yield farmers.This has caused problems such as uneven greenhouse structures,poor economics and poor applicability in many areas.In the meanwhile the blindness planting management results in lower income in the shed.Therefore,it is necessary to guide the farmers to build greenhouses according to the climatic conditions of different latitudes,and point out the wrong planting management mode in actual production..This paper investigates 15 solar greenhouses in Wafangdian City,Liaoning Province,and records the structural dimensions,load-bearing skeleton materials,wall materials,construction costs,indoor and outdoor temperature and lighting parameters of the greenhouse,and analyzes the construction dimensions of different greenhouses’ differences in indoor warm-light environment caused by different building materials in Wafangdian City,and by investigating the planting management methods commonly used by producers in the region,such as the arrangement of the mouthwash,fertilization etc,to combined with the status of pests and diseases in the greenhouse and the income of tomatoes in the region,etc.The main problems in the local greenhouse structure design,building materials,planting technology etc,and targeted recommendations were given.Through the investigation,the following conclusions can be drawn:(1)The wall of the solar greenhouse in Wafangdian area is mainly composed of earth wall,the insulation material is mainly straw curtain,and the environmental adjustment ability of solar greenhouse is weak.It is necessary to improve the conditions of solar greenhouse equipment and improve the management of water and fertilizer.(2)The ridge span ratio increases,and the annual minimum temperature in the greenhouse increases.The crop yield in the solar greenhouse can be improved by adjusting the greenhouse ridge span ratio.(3)Application of excess fertilizer will reduce the production efficiency of farmers,and we should increase the application rate of farmyard manure to promote the yield of tomato in the region. |
