Potential N mineralization and availability to maize in black soils in response to soil fertility improvement in Northea
- PDF / 520,889 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 56 Downloads / 168 Views
SOILS, SEC 3 • REMEDIATION AND MANAGEMENT OF CONTAMINATED OR DEGRADED LANDS • RESEARCH ARTICLE
Potential N mineralization and availability to maize in black soils in response to soil fertility improvement in Northeast China HaiMei Fu 1,2 & YingHua Duan 1 & Ping Zhu 3 & HongJun Gao 3 & MingGang Xu 1,4
&
XiaoMei Yang 5,6
Received: 6 July 2020 / Accepted: 29 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Understanding the soil nitrogen (N) mineralization potential (N0) and crop N availability during the growing season is essential for improving nitrogen use efficiency (NUE) and preventing over-fertilization, which lead to negative environmental impacts. Methods Five black soils with different levels of fertility were selected in Northeast China. The N0 and kinetics of these soils were estimated through laboratory experiments at different incubation temperatures (15, 25, and 35 °C). N mineralization dynamics were simulated using field soil temperature according to the incubation results. Moreover, the N uptake dynamics of maize were simulated according to the literature. Results Compared with the very low-fertility soils, the cumulative mineralized nitrogen increased under all incubation temperatures (15, 25, and 35 °C), by 48–136%, 8–61%, and 24–59%, respectively, in the medium- and high-fertility soils. The highest N0 values (96.90, 115.31, and 121.33 mg/kg at the three different temperatures) were recorded in the very high-fertility soils. The soil N mineralization dynamics and N uptake of maize in the growing season were highly consistent over time, although the soil N supply could not meet the maize growth requirements. The higher the soil fertility, the lower the N fertilizer requirement. Conclusions Different fertilizer strategies were developed based on the cumulative mineralized N, N uptake by maize, and NUE in soils with different fertility levels. We suggested a reduction of 50–65 kg N/ha in N fertilizer in the two highest fertility soils. This study provided basic data to reduce chemical N fertilizer to improve NUE and reduce negative environmental impacts. Keywords Black soil zones . Soil fertility . Potentially mineralized nitrogen (N0) . Nitrogen fertilization . Environmental impacts
1 Introduction Nitrogen (N) is an abundant element on Earth that accounts for 78.1% of Earth’s atmosphere and is an essential nutrient
for all forms of life (Geisseler et al. 2009; Stevens 2019). N is also the most common growth-limiting nutrient in agricultural production systems. The N absorbed by crops is primarily derived from soil. Nevertheless, organic N is the main form
Responsible editor: Jianming Xue * YingHua Duan [email protected] * MingGang Xu [email protected] 1
2
National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, South Zhongguancun Street No. 12, Beijing 100081, People’s Republic of China Beijing Center for Physical and Chemical Analys
Data Loading...
