氮素形态与马铃薯品质的关系

在田间条件下研究了不同形态氮素对马铃薯块茎硝酸盐含量、淀粉、蛋白质及还原糖含量的影响。结果表明,马铃薯块茎内硝酸盐含量从块茎形成期到成熟收获期是逐渐降低的。使用铵态氮肥并加硝化抑制剂双氰胺可以显著地抑制马铃薯块茎硝酸盐的积累;与硝酸盐含量变化相似,从块茎形成期到收获期蛋白质含量也逐渐降低,不同氮素形态处理对马铃薯块茎内蛋白质含量的影响无显著差异;铵态氮添加双氰胺处理可降低块茎还原糖含量。虽然马铃薯被认为是喜硝作物,但本研究表明,不同氮素形态处理不仅没有造成马铃薯产量的显著差异,而且块茎内淀粉含量也无显著差异。

Relation between Nitrogen Form and Potato(Solanum tuberosum L.)Tuber Quality

Influence of nitrogen forms on nitrate,protein,starch and reducing sugar concentrations in potato tubers was studied under field conditions in Inner Mongolia.Nitrate concentration in potato tuber decreased gradually with the tuber development,and NH4 with DCD could reduce the nitrate content in tubers.It also significantly decreased reducing sugar concentration in tubers.Similarly,the protein concentration in potato tubers also decreased with tuber development,and the nitrogen form showed no effects on the tuber protein con-centration.Different nitrogen forms caused no significant changes either in tuber yield or in tuber starch content although potato has been considered as NO3-preferred plant.