Track 2-1-2: Forage Conservation, Value Addition and Balanced Nutrition
Description
Greenhouse dryer implies drying of crops in covered structure that allows rapid harvesting of solar radiation and modification of agro climatic conditions conducive for proper drying. The environmental factors which affects plant growth includes air temperature, relative humidity, light, carbon dioxide concentration, soil temperature and moisture content of soil. The greenhouse may have heating, cooling and ventilating equipments for control over microclimates. Control over microclimate results in several fold increase in crop photosynthesis, and optimum thermal energy for forage conservation in the form of hay.
Chandra et al. (2002) have proposed the design of a naturally ventilated greenhouse. Several other single and multispan greenhouses for use in various regions of India have been developed (N.C.P.A.H., 2001). Tiwari (1984) analyzed winter greenhouse. Effect of various parameters viz. ventilation/ infiltration, relative humidity, movable insulation etc. have been incorporated in the analysis and their effect on the performance of greenhouse was studied. He reported that temperature rise of the plant and room air is increased upto about 3-5 ºC by covering the system with movable insulation. The performance of the greenhouse is improved by concrete north wall. It reduces the heat losses during the night.
Tiwari and Dhiman (1986) presented a design and mathematical model for a winter greenhouse at Leh, Jammu and Kashmir in India. In this part of the country, the ambient air temperature, in winter, dips down to –30 ºC and goes upto a maximum of about 25 ºC in summer. Here, greenhouses are possible because solar isolation is available for almost 11 months of the year. Numerical calculations show that a glass wall on the south side and an insulated wall and roof on the north side give good results.
Coffin et al. (1988) measured the transmittance of solar radiation into scale models of multispan greenhouses for a complete year, under a wide variety of climatic conditions. Models of conventional greenhouses, which were oriented East-West or North-South, and glazed with clear or diffuse glass, and models of two prototype multispan insulated greenhouses, oriented East-West with the north-facing roof sections insulated were tested. The East-West greenhouse models had higher overall light levels than the North-South ones during the winter months. The insulated greenhouses had moderate reductions in light levels during the winter as compared to the conventional models.
Included in
Development of Greenhouse Dryer for Forage Conservation in Temperate Climate
Greenhouse dryer implies drying of crops in covered structure that allows rapid harvesting of solar radiation and modification of agro climatic conditions conducive for proper drying. The environmental factors which affects plant growth includes air temperature, relative humidity, light, carbon dioxide concentration, soil temperature and moisture content of soil. The greenhouse may have heating, cooling and ventilating equipments for control over microclimates. Control over microclimate results in several fold increase in crop photosynthesis, and optimum thermal energy for forage conservation in the form of hay.
Chandra et al. (2002) have proposed the design of a naturally ventilated greenhouse. Several other single and multispan greenhouses for use in various regions of India have been developed (N.C.P.A.H., 2001). Tiwari (1984) analyzed winter greenhouse. Effect of various parameters viz. ventilation/ infiltration, relative humidity, movable insulation etc. have been incorporated in the analysis and their effect on the performance of greenhouse was studied. He reported that temperature rise of the plant and room air is increased upto about 3-5 ºC by covering the system with movable insulation. The performance of the greenhouse is improved by concrete north wall. It reduces the heat losses during the night.
Tiwari and Dhiman (1986) presented a design and mathematical model for a winter greenhouse at Leh, Jammu and Kashmir in India. In this part of the country, the ambient air temperature, in winter, dips down to –30 ºC and goes upto a maximum of about 25 ºC in summer. Here, greenhouses are possible because solar isolation is available for almost 11 months of the year. Numerical calculations show that a glass wall on the south side and an insulated wall and roof on the north side give good results.
Coffin et al. (1988) measured the transmittance of solar radiation into scale models of multispan greenhouses for a complete year, under a wide variety of climatic conditions. Models of conventional greenhouses, which were oriented East-West or North-South, and glazed with clear or diffuse glass, and models of two prototype multispan insulated greenhouses, oriented East-West with the north-facing roof sections insulated were tested. The East-West greenhouse models had higher overall light levels than the North-South ones during the winter months. The insulated greenhouses had moderate reductions in light levels during the winter as compared to the conventional models.
