The Effects of Nitrogen Addition on the Uptake and Allocation of Macro- and Micronutrients in Bothriochloa ischaemum on Loess Plateau in China

Abstract

The effects of nitrogen (N) addition on the macro- and micronutrient concentrations, storage, and allocation of Bothriochloa ischaemum (L.) Keng, a native forage plant on the Loess Plateau in China remain unclear. We studied the effects of N addition at 0 (CK), 2.5 (N1), 5.0 (N2), and 10.0 (N3) g N m-2 y-1. N addition significantly decreased the available copper (Cu), zinc (Zn), and total Cu concentration, but significantly increased the available iron concentration in the soil. Cu, manganese (Mn), and sodium (Na) concentrations in aboveground tissues and potassium (K), magnesium, and Zn concentrations in belowground tissues significantly increased with N addition. Calcium (Ca) concentrations in belowground tissues decreased significantly. The ratios of above- to belowground Ca, Cu, Zn, and Mn significantly increased with N addition. The maximum ratios appeared at N2 for Cu, Zn, and Mn. The aboveground, belowground, and total biomass storage of studied nutrients significantly changed with N addition, and most attained maximum values under N2 treatment. The storage ratios of above- to belowground Cu, Zn, Mn, and Na attained maximum values at N2. We conclude that N addition significantly, but differentially influence the macro- and micronutrient concentrations and storage in B. ischaemum. B. ischaemum allocated and accumulated increased macro- and micronutrients to its aboveground tissues and exhibited high total storage when the amount of N addition reached 5 g N m-2 y-1.

Macronutrients in Soil and Wheat as Affected by a Long-Term Tillage and Nitrogen Fertilization in Winter Wheat–Fallow Rotation

“…Consistent decline of Ca in the studied soil depths, except in 30-60 cm, was observed with the high N rates (Figure 3), which doesn't support our first hypothesis for Ca. This result is in line with the study of Ai et al [22]; however, other studies had contrasting results [7,20]. The availability of Ca is inversely related to soil acidity and decreases with high N application rates.…”

Nitrous Oxide Emission from Forage Plantain and Perennial Ryegrass Swards Is Affected by Belowground Resource Allocation Dynamics

“…This situation might explain the relatively high N surplus and N 2 O emissions observed for the N300 treatments compared with N150 in the current study (Table 2). In any case, N addition stimulated the root growth and development, enhancing the uptake of other nutrients [35]. Generally, more N was taken up as the N rate increased; thus, N fertilization reduced the C/N ratio in both below-and aboveground biomass, with this trend being most evident in the N300 treatment, indicating a luxury uptake of N, similar to earlier reports in maize straw [36] and grass swards [37].…”

In silico Analysis of OsNRT2.3 Reveals OsAMT1.3, OsZIFL9, OsbZIP27, and OsIRT1 as Potential Drought-related Genes During Nitrogen Use Efficiency in Oryza sativa L.

“…Interactions between essential nutrients, such as iron (Fe), nitrogen (N), sulfur (S), and phosphorus (P), were reported to influence transport, homeostasis, and assimilation processes for proper growth and development in plants (Kumar et al, 2021). For example, according to Singh et al (2018), the concentration of Fe, Zn, and protein in wheat grains increased due to the interaction of Fe and Zn with N. Likewise, the concentration of micronutrients like Cu, Zn, Mn, and Na increased in the belowground tissue of Bothriochloa ischaemum when exposed to a high amount of N (Ai et al, 2017). Thus, our study demonstrates that the NUE system's potential drought-related genes, OsAMT1.3, OsbZIP27, OsIRT1, and OsZIFL9, are highly associated with OsNRT2.3, and OsZIFL9 and OsIRT1 might be key players in the interaction of macronutrient N and micronutrient Fe in rice.…”