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1.光合作用与氮肥量和行株距的关系。棉花品种108F以60×22.5厘米和90×15厘米的行株距进行栽培(每公顷74000株)。每公顷施用氮175公斤,五氧化二磷125公斤、氧化钾60公斤。或者每公顷施用氮250公斤,五氧化二磷175公斤,氧化钾80公斤。在第一片真叶期,施用较高氮量的植株的光合作用有所降低,但这种不利的影响在以后的生育期里则受到抑制。此时,施用较高氮量和宽行种植的植株的光合作用能力要比施用较低的氮量和窄行种植的植株高些。白天的光合率依赖于环境条件,在上午,随着光照的增强和温度的升高,光合作用也随着增加,到15—17时,光合作用强度最高,以
1. Photosynthesis and nitrogen fertilizer and row spacing relationship. The 108F cotton cultivar was cultivated at a row spacing of 60 × 22.5 cm and 90 × 15 cm (74,000 plants per hectare). 175 kg of nitrogen per hectare, 125 kg of phosphorus pentoxide and 60 kg of potassium oxide. Or 250 kg of nitrogen per hectare, 175 kg of phosphorus pentoxide and 80 kg of potassium oxide. In the first true leaf stage, the photosynthesis of plants that were exposed to higher nitrogen levels was reduced, but this detrimental effect was suppressed later in the growing season. At this point, the photosynthesis capacity of plants grown with higher nitrogen and wide lines was higher than with plants with lower nitrogen and narrow lines. During the day, the photosynthetic rate is dependent on the environmental conditions. In the morning, photosynthesis increases with increasing light intensity and temperature. By 15-17, photosynthesis intensity is the highest