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在长期单施无机氮肥(15年)条件下,黄瓜生长发育正常,而且随着施N量的增加(试验中的最高施N处理为每年600kghm-2),叶面积显著增大,叶片的叶绿素含量、光合速率显著提高,但处理间叶片胞间CO2浓度、气孔导度无显著差异,说明不同N水平对黄瓜叶片净光合速率的作用主要是由非气孔因素造成的,长期单施无机氮肥还显著地提高了黄瓜的产量、结瓜数、座瓜率,降低了畸形瓜率。N、P、K配施可进一步提高黄瓜叶片的叶绿素含量、光合速率、产量、结瓜数和座瓜率,降低畸形瓜率,但处理间叶片胞间CO2浓度、气孔导度仍无显著差异,说明不同N、P、K配施对黄瓜叶片净光合速率的作用主要也是由非气孔因素造成的。同时,在N、P、K配施试验中,以N对黄瓜光合作用及产量的影响最大,P次之,K较小。
Under long-term application of inorganic N fertilizer (15 years), cucumber growth and development were normal, and with the increase of N application (the highest N treatment in the experiment was 600 kghm-2 per year), leaf area increased significantly, Content and photosynthetic rate were significantly increased, but there was no significant difference in intracellular CO2 concentration and stomatal conductance between treatments, indicating that the effect of different N levels on net photosynthetic rate of cucumber leaves was mainly caused by non-stomatal factors. Significantly increased the yield of cucumber, the number of knot melon, melon rate, reduce the rate of deformity melon. The combination of N, P and K could further increase the chlorophyll content, photosynthetic rate, yield, the number of cucumbers and cucumber rate of cucumber leaves, and reduce the rate of deformity, but there was no significant difference between intercellular CO2 and stomatal conductance , Indicating that the effect of different N, P, K treatments on net photosynthetic rate of cucumber leaves is mainly caused by non-stomatal factors. At the same time, N, P, K cooperated with the experiment, N had the greatest effect on the photosynthesis and yield of cucumber, P times and K smaller.