作　　者： ; ; ; ;

机构地区： 甘肃农业大学农学院

出　　处： 《甘肃农业大学学报》 2009年第6期39-43,共5页

摘　　要： 大田试验条件下,研究了5个不同形态氮素比处理水平对马铃薯体内氮素分布、块茎形成期的光合参数以及收获期的干物质量和产量的影响.结果表明:铵态氮和硝态氮的比例为3∶9时,植株体内氮素含量及块茎中的氮素含量在成熟期最高,分别为21.77 mg.g-1和19.10 mg.g-1;光合速率与气孔导度均随着铵硝比下降而升高,单施硝态氮时,光合速率为20.33μmol.m-2.s-1,气孔导度为342.00 mmol.m-2.s-1,胞间CO2浓度为224.67μmol.mol-1;铵硝比为3∶9时,马铃薯产量最高,为26.08 t.hm-2,较对照增加了28.1%. The nitrogen distribution of potato, photosynthetic parameter of tuber initiation stage, a- mount of dry matter and yield treated with five NH4^＋ /NO3^- ratios of different stage were investigated in field experiment. The results indicated that when NH4^＋/NO3^- ratio was 3 ： 9, the N content in both the plant and the tuber at the mature stage was the highest,being to 21.77 mg g ^-1 and 19. 10 mg · g^-1 separately. Both the photosynthetic rate（Pn） and the cond（Gs） increased,with the ratio of the NH4^＋/NO3^- decreasing. When only NO3^--N was used,the photosynthetic rate（Pn） was 20. 33/,mol · m ^-2 · s^- 1 ,the cond （Gs） was 342.00 mmol · m^- 2 ·s^- 1 and the Ci was 224.67μmol · mol^-1 When NH4^＋/NO3^- ratio was 3 ： 9,the highest yield was 26.08 t· hme,increasing by 28. 1 %. NH4^＋/NO3^- ratio had an effect on growing and yield of the potato. The best NH4 ^＋/NO3^- ratio was 3：9 in contrast to CK.

关 键 词： 马铃薯 氮素比 氮素分布 光合参数 产量

领　　域： [农业科学]