Abstract:

Using transparent，black plastic film and grass as cover on potato(variety ‘Netherlands No. 7’ ) field，we compared the effects of different covering methods on the nitrogen metabolism of potato leaves，and we probed the interrelationships between the contents of the nitrogen and the soluble protein，and the activity of the nitrogen metabolism related enzyme. The results showed that，the contents of the nitrogen and the soluble protein，and the activity of nitrate reductase，glutamine synthase and glutamate dehydrogenase，all kept declining from tuber initiation stage to starch accumulation stage. And the indicators of potato covering different combinations were all higher than control，and their differences reached significant or extremely significant level，among which "straw and transparent plastic film" covering treatment were the highest. According to relevance analysis，in each treatment，the contents of the nitrogen and the soluble protein of potato leaves all had an significant or extremely significant positive correlation with the activity of NR，GS and GDH；And the activity of GS all had an significant or extremely significant positive correlation with and the activity of NR and GDH；And the activity of NR all had an significant or extremely significant positive correlation with and the activity of GDH.