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.
ZHANG Shou-Du,LI Yan-Feng-*,LI Jiu-Sheng. Effects of film-uncovering time on soil enzyme activity and maize nitrogen uptake under drip irrigation[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(5): 454-460.
SONG Na, WANG Fengxin, YANG Chenfei, et al. Coupling effects of water and nitrogen on yield, quality and water use of potato with drip irrigation under plastic film mulch[J]. Transactions of the CSAE, 2013, 29(13):98-105.(in Chinese)
HOU Shulin, ZHANG Jiaxi, XIE Jianhua, et al. Survey on residual film pollution and mechanized recycling equipment[J]. Xinjiang agricultural mechanization, 2016(5):12-14.(in Chinese)
DICK R P. Soil enzyme activities as indicators of soil quality[J]. Soil Science Society of America journal, 1994, 58:107-124.
PAGLIAI M, NOBILIM D. Relationships between soil porosity, root development and soil enzyme activity in cultivated soils[J]. Geoderma, 1993, 56(1/2/3/4):243-256.
TIAN L, DELL E, SHI W. Chemical composition of dissolved organic matter in agroecosystems: correlations with soil enzyme activity and carbon and nitrogen mineralization[J]. Applied soil ecology, 2010, 46(3):426-435.
SAHA S, GOPINATH K A, MINAB L, et al. Influence of continuous application of inorganic nutrients to a maize-wheat rotation on soil enzyme activity and grain quality in a rainfed Indian soil[J]. European journal of soil biology, 2008, 44(5/6):521-531.
LALANDE R, GAGNON B, SIMARDR R, et al. Soil microbial biomass and enzyme activity following liquid hog manure application in a long-term field trial[J]. Canadian journal of soil science, 2000, 80(2):263-269.
MASCIANDARO G, CECCANTI B, BENEDICTO S, et al. Enzyme activity and C and N pools in soil following application of mulches [J]. Canadian journal of soil science, 2004, 84(1):19-30.
DOU Chaoying, KAN Yuehu, WAN Shuqin, et al. Effect of mulch-drip irrigation on soil enzyme activities of saline-sodic soil with shallow water table[J]. Transactions of the CSAE, 2010, 26(3):44-51.(in Chinese)
CHEN Shutao, SANG Lin, ZHANG Xu, et al. Effects of warming and straw application on soil respiration and enzyme activity in a winter wheat cropland[J]. Environmental science, 2016(2):703-709.(in Chinese)
MARÍA D L P J, HORRA A D L, PRUZZO L, et al. Soil quality: a new index based on microbiological and biochemical parameters[J]. Biology & fertility of soils, 2002, 35(4):302-306.