Methods for determining exergy photosynthesis in crop production

Abstract

It is shown that there is an energy types group that does not contain irreversible energy - anergies, and completely or partially consist of a transformable part - exergy. In the crop production productivity bioenergetic theory, as a similar value, one can take the light radiation exergy - that light radiation energy part supplied to plants that can potentially be used by them for photosynthesis and converted into a crop product. As a methodological basis for determining the complex light radiation exergy, as well as any other spectral composition light emission, concerning plant photosynthesis arriving over the given period, it is taken the radiation density distribution over the radiation source spectrum, taking into account the photosynthesis spectral efficiency (action spectrum). The determination method is shown step by step using the two light radiation sources assessing the photosynthetic exergy example - a warm-cold LED lamp LL LED and a LED Phyto-lamp LED - M80. As a result, the photosynthetic exergy values were obtained, respectively - 1552.6 and 1728.5 J. The developed computer program, which is based on the light radiation exergy magnitude, is designed to calculate optimization indicators and select, on their basis, the plants’ type (variety, hybrid) to obtain the required products for compliance with the land ecological conditions. The program use should ensure a reduction in the crop production cost by 30-40%, energy consumption by 25-30% and increase the land-use efficiency by 30-35%.