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以甜瓜为材料,探讨了叶面喷施不同浓度硝酸钕(0,5,10,25,50,100 mg·L-1)对甜瓜光合特性、产量和品质的影响。结果表明,10和25 mg·L-1硝酸钕处理的表现最突出:这两个处理的甜瓜叶片净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)均极显著或显著高于其他处理,胞间CO2浓度(Ci)均极显著低于其他处理;PSⅡ潜在活性(Fv/Fo)、PSⅡ最大光化学量子产量(Fv/Fm)、PSⅡ实际光化学量子产量(ΦPSⅡ)、相对光合电子传递速率(ETR)和光化学猝灭系数(qP)均极显著或显著高于其他处理,非光化学猝灭系数(qN)均极显著低于其他处理;且10 mg·L-1硝酸钕处理的果实产量最高、品质最佳。100 mg·L-1硝酸钕处理对甜瓜生长后期的光合作用产生抑制,降低了果实产量和品质。25 mg·L-1硝酸钕处理浓度较高,但对于甜瓜光合、产量和品质等指标的影响与10 mg·L-1硝酸钕处理并无显著差异,因此认为,10mg·L-1硝酸钕可以作为稀土钕在甜瓜生产上应用的适宜浓度。
The effects of different concentrations of neodymium nitrate (0, 5, 10, 25, 50, 100 mg · L-1) on the photosynthetic characteristics, yield and quality of melon were studied using melon as the material. The results showed that the treatment of 10 and 25 mg · L-1 neodymium nitrate was the most prominent. The net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) of melon leaves were extremely significant or significant Compared with other treatments, the intercellular CO2 concentration (Ci) was significantly lower than that of other treatments. The activities of PSⅡ, Fv / Fo, Fv / Fm and ΦPSⅡ, The photosynthetic electron transfer rate (ETR) and photochemical quenching coefficient (qP) were significantly or significantly higher than those of other treatments, and the non-photochemical quenching coefficients (qN) were significantly lower than those of other treatments. And 10 mg · L-1 neodymium nitrate Processing the highest yield of fruit, the best quality. Neodymium nitrate 100 mg · L-1 inhibited the photosynthesis of melon in the late growth stage and decreased fruit yield and quality. 25mg · L-1 neodymium nitrate treatment higher concentration, but for melon photosynthesis, yield and quality indicators and 10 mg · L-1 neodymium nitrate treatment did not differ significantly, it is considered, 10mg · L-1 neodymium nitrate Can be used as a suitable concentration of rare earth neodymium melon production.