Problems and countermeasures in the construction of multi-span greenhouses
The development of multi-span greenhouse construction is blind, which is mainly reflected in two aspects: one is blindness in expanding the area of solar greenhouses, which wastes money and has low efficiency; the other is the convergence of types, structures and applications of solar greenhouses. At present, the development of solar greenhouse should be based on a stable area, increase the connotation, and develop in the direction of benefit. It is necessary to choose the appropriate greenhouse type, structure and supporting equipment according to the use, that is, according to the use and production needs, build solar greenhouses of different sizes, specifications and grades, and strive to be economical, modern and efficient.
Less resilient to natural disasters and adversity. The problems existing in the production of fruits and vegetables in winter are the influence of sub-low temperature, chilling injury and freezing injury, and the indoor temperature is high in summer. This not only reduces the yield and quality of vegetables, but also relates to the stability of production. The countermeasures taken are: the solar greenhouse should have fixed or temporary heating equipment throughout the year, and take cooling measures in summer. Another kind of disaster is the harm of pests and diseases. It is necessary to adopt modern comprehensive prevention and control technology, focus on prevention, strengthen monitoring, and reduce disasters to a lower level. In terms of pest control, it is necessary to change from dual control of prevention and production to ternary control (control, production, pollution).
The modern cultivation system for vegetable production in multi-span greenhouses has not yet been established. The establishment of a modern cultivation system in a solar greenhouse should be based on the rational use of land and nutrients, which is conducive to the control of pests and diseases and the obstacles to continuous soil cropping, and realizes the market-oriented management of modern vegetables. Change the current continuous cropping system, implement a reasonable large-scale crop rotation (greenhouse group vegetable rotation), change the random selection of vegetable cutting and cultivation types, combine the advantages of ecology, resources, and regions, implement institutionalized planting, and change the existing harvesting according to market demand. Cultivation system, but not to gain temporary benefits at the expense of forgoing greenhouse sustainability.
