2020
DOI: 10.1080/00380768.2020.1843072 View full text |Buy / Rent full text
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Abstract: Combined applications of plant residues and nitrogen (N) fertilizer in agroecosystems may increase N immobilization and reduce N loss through microbial propagation using fresh organic matter (FOM). However, the effects of different carbon (C) availabilities in FOM to microbes on the immobilization of two forms of fertilizer-N (NH 4 + -N and NO 3 − -N) are still not clear. In this study, starch (high availability) and cellulose (low availability) were used to represent different polysaccharides in crop residues… Show more

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“…Furthermore, NH4+ can control NO3 assimilatory reduction through NO3 reductase synthesis suppression and NO3 transport repression (Rice & Tiedje, 1989). Globally, strong positive relationship ( R 2 = .46, p < .001; Figure 3k) between MBN and I NH4 were found, confirming that MB is actively assimilating NH4+ (Corre et al, 2003; Li et al, 2021; Ma et al, 2021). Serna‐Chavez et al (2013) showed that MB can assimilate up to 138 mg N of 200 mg N added during a 3‐day incubation.…”
Section: Discussionmentioning
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“…Furthermore, NH4+ can control NO3 assimilatory reduction through NO3 reductase synthesis suppression and NO3 transport repression (Rice & Tiedje, 1989). Globally, strong positive relationship ( R 2 = .46, p < .001; Figure 3k) between MBN and I NH4 were found, confirming that MB is actively assimilating NH4+ (Corre et al, 2003; Li et al, 2021; Ma et al, 2021). Serna‐Chavez et al (2013) showed that MB can assimilate up to 138 mg N of 200 mg N added during a 3‐day incubation.…”
Section: Discussionmentioning
“…were found, confirming that MB is actively assimilating NH + 4 (Corre et al, 2003;Li et al, 2021;Ma et al, 2021). Serna-Chavez et al (2013) showed that MB can assimilate up to 138 mg N of 200 mg N added during a 3-day incubation.…”
Section: Nh4 Is the Main Process Of Global Gi But What Is Its Fate?mentioning
“…Sources of soil carbon (C) and OM such as crop residues (specifically corn stover in this study) has been widely promoted in agroecosystems all over the world to increase soil C stock, improving synchrony of nutrients supply ( e.g., from mineral fertilization) 44 46 . Therefore, keeping crop residues in the field could reduce the amount of N that leaches during the initial stage of crop growth when N demand is low, especially when there is high soil N leaching risk ( e.g., the snow melting or heavy spring rain events during early crop growth stages) 6 , 46 49 .…”
Section: Discussionmentioning
“…Sources of soil carbon (C) and OM such as crop residues (specifically corn stover in this study) has been widely promoted in agroecosystems all over the world to increase soil C stock, improving synchrony of nutrients supply ( e.g., from mineral fertilization) 44 46 . Therefore, keeping crop residues in the field could reduce the amount of N that leaches during the initial stage of crop growth when N demand is low, especially when there is high soil N leaching risk ( e.g., the snow melting or heavy spring rain events during early crop growth stages) 6 , 46 49 . The subsequent remineralization of the immobilized N can supply mineral N for crop growth, indicating that the incorporation of corn stover, which contains a larger amount of C with high availability, can improve N synchrony to corn cropping systems by increasing NH 4 + availability.…”
Section: Discussionmentioning
“…Partial substitution of chemical fertilizers with organic material has also been advocated. However, the effects change not only with the properties of organic materials, such as C/N ratio, lignin content, and soluble organic N [22][23][24], but also with the status of soils [25]. In contrast to the farmland, organic manure is widely used at 13-20 t ha −1 annually in vegetable fields [26], and the amount of N fertilization is two to three times higher [27].…”
Section: Introductionmentioning