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棉花在生长过程中所形成的有机质占棉株总干重的90％,这些物质都来自光合作用。而光合作用合成的有机物质数量,又决定于光合面积、光合能力及光合时间三项因素;光合作物减去呼吸消耗和脱落的器官干重、剩下的干重包括根、茎、叶、铃壳和籽棉等的干重便是生物产量。生物产量=光合面积X光合能力X光合时间-消耗和脱落在生物产量中,经济价值较高的主要收获物如棉花中的皮棉干重(或籽棉干重)便是经济产量。经济产量与生物产量的比值称为经济(产量)系数。
The organic matter formed by cotton during its growth accounts for 90% of the total dry weight of the cotton, all of which comes from photosynthesis. The amount of organic matter synthesized by photosynthesis is determined by three factors: photosynthetic area, photosynthetic capacity and photosynthetic time; photosynthesis minus the exhaled and exfoliated organ dry weight, the remaining dry weight including roots, stems, leaves, Dried shell and seed cotton dry weight is the biological production. Biomass = photosynthetic area X Photosynthetic capacity X Photosynthetic time - Consumption and shedding Economic yield is the economic yield of the most economically important major harvests such as cotton lint dry weight (or seed cotton dry weight) in biological production. The ratio of economic output to biological output is called the economic (production) coefficient.