【摘要】 采用设施栽培的试验方法,测定时分为黄瓜初花叶位、花叶叶位、果叶叶位,研究了不同铵态氮/硝态氮肥料配比对黄瓜叶绿素、光合作用及果实品质的影响。结果表明:相同处理的黄瓜不同叶位的SPAD差异显著,黄瓜花叶叶位的SPAD值最大,其次是果叶叶位,最后是初花叶位;不同的铵态氮、硝态氮配施,无论是初花、花叶还是果叶叶位的SPAD都随着硝态氮的增加而增大,总的来说,不同施肥配比处理间的差异不是很显著;适宜的肥料水平有利于提高作物的光能转化效率,更能促进植株光合作用的提高,净光合速率、气孔导度、胞间CO2浓度、蒸腾速率,花叶叶位最大,果叶叶位次之,初花叶位最小。铵态氮与硝态氮配施比例为(NO3-∶NH4+=50∶50)时,黄瓜果实的硝酸盐、有机酸含量最低,VC含量最高,品质较好,产量较高。更多还原

【Abstract】 With the facility experiments,it was investigated that the influence on chlorophyll of cucumber,photosynthesis and fruit quality on different ratios of ammonium-N and nitrate-N.Results showed as follows:in the same treatment,different leaves′ SPAD was significant,flower leaves affected SPAD very much,fruit leaves less,and early flower leaves the least.Different nitrate-N and ammonium-N combined,with the increase of nitrate-N,SPAD of the flower leaves,fruit leaves,early flower leaves increased.In general,different fertilizer ratio was not significant.Appropriate fertilizer level was helpful to improve the efficiency of light conversion,and could enhance the plants photosynthesis.The net photosynthesis rate,Cond,Ci,the transpiration rate had the same changing rule on cucumber:flower leaves was the greatest,fruit leaves was the second,early leaves was the last.When the ratio of the nitrate-N and ammonium-N is 1∶ 1,the nitrate and organic acidcontent was lower,VC content was higher,quality was better,yield was higher.更多还原