Abstract Effects of film-uncovering time and fertilization on soil urease activity, asparaginase activity and maize nitrogen uptake were studied under drip fertigation conditions to provide theoretical basis and reference for the optimal film-uncovering time of maize with mulched drip irrigation in Northeast China. Three film-uncovering treatments and a bare soil treatment were set in experiment. In each treatment, fertilization and no fertilization were included, thus there were 8 treatments totally. The results show that the soil urease activity decreases significantly with increasing soil NH+4-N and moisture in uncovering film treatments in seedling stage, uncovering in heading stage and filming in the whole growth period of maize, but the difference between film uncovering treatments is not significantly statistical. The asparaginase activity in soil does not change significantly with covering duration. The maize nitrogen uptake can increase significantly in three film uncovering treatments, but the nitrogen uptake declines in filming treatments in the whole growth period of maize under fertilizing condition. The correlations of soil urease activity with soil water, soil temperature and soil inorganic nitrogen content are significantly statistical, but the urease activity reduces because of the increase of both soil water and NH+4-N. The soil asparaginase activity does not have a relationship with soil water, soil temperature and soil inorganic nitrogen content. Therefore, the uncovering film treatments in seedling stage and uncovering treatments in heading stage can allow the soil enzyme activity to maintain a suitable. activity level and provide a more favorable soil environment for the growth of maize.
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