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为了研究施氮量对马铃薯全生育期光合特性及产量的影响,在田间试验条件下,以延薯四号作为供试材料,设置4个施氮水平CK(不施氮)、N1(低氮)、N2(中氮)、N3(高氮),在马铃薯全生育期进行了叶面积指数、功能叶片的净光合速率、胞间CO_2浓度、气孔导度及SPAD等相关指标的测定。研究结果表明,本试验条件下,合理施氮有助于提高马铃薯叶片的光合性能。在一定范围内,随着施氮量的增加,叶面积指数、SPAD值、生物产量显著增加;全生育期马铃薯SPAD值与产量呈极显著正相关;马铃薯生育前期,叶面积指数与产量呈极显著正相关;块茎膨大后期,光合速率与产量呈极显著正相关。本试验条件下,施氮量为N2(纯氮150 kg/hm2)时经济产量最高。
In order to study the effects of nitrogen application rate on photosynthetic characteristics and yield during the whole growth period of potatoes, four nitrogen application rates, CK (no nitrogen application), N1 (low nitrogen ), N2 (medium nitrogen) and N3 (high nitrogen). The leaf area index, net photosynthetic rate of functional leaves, intercellular CO2 concentration, stomatal conductance and SPAD were measured in the whole growth period of potato. The results show that under the conditions of this experiment, reasonable nitrogen application will help to improve the photosynthetic characteristics of potato leaves. Within a certain range, leaf area index, SPAD value and biomass increased significantly with the increase of nitrogen application rate. There was a significant positive correlation between SPAD value and yield of whole potato during the whole growth period. The leaf area index and yield of potato There was a significant positive correlation between photosynthesis rate and yield. Under the conditions of this experiment, the economic yield was the highest when nitrogen application rate was N2 (pure nitrogen 150 kg / hm2).