| This article has been：Browse 1482Times Download 1613Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2020157 |
|
| The Combination of Biochar Addition and Nitrogen Fertilizer Application Affects Soil Microbial Community and Functions and Jujube Yield |
|
JIANG Li
|
|
Nanyang City Yahekou Irrigation District Administration, Nanyang 473012, China
|
| Abstract: |
| 【Background】Intensive cultivation including excessive application of agrochemicals is widely used by framers in north China as an insurance to achieve high yield. While nitrogen fertiliser is important to improve crop yield, its overuse in China has resulted in not only resource waste but also environmental contamination such as soil acidification and compaction, as well as groundwater pollution. Therefore, it is imperative to develop sustainable and environmentally friendly agronomical managements to improve soil quality while in the meantime reduce agrochemical application so as to ameliorate environmental pollution. Amending soil with biochar has proven able to improve soil quality due to its specific physicochemical properties, but how biochar addition and nitrogen application combine to alter soil fertility remains elusive.【Objective】The object of this study is to evaluate the combined impact of biochar amendment and nitrogen fertilizer application at different ratios on soil microbial community and activities in a jujube yield in the north China plain.【Method】The field experiment was conducted in non-polluted jujube production base in Neihuang county, Henan province in 2017 to 2018. It consisted of seven treatments: CK (no fertilizer and biochar amendment), three levels of biochar amendment (10, 20 and 30 t/hm2) and two levels of nitrogen fertilization (300 and 400 kg/hm2). In each treatment, we measured soil enzymatic activities and microbial community.【Results】①Compared with CK, applying biochar and nitrogen fertilizer significantly improved the activities of catalase, urease and invertase in soil. The activities of catalase and urease peaked in B30+N400, up by 93.9% and 71.4% respectively over the CK. The activity of invertase peaked in B30+N300, increasing by 42.7% over the CK. ②Soil microbial communities increased with biochar and nitrogen fertilizer application, with the numbers of bacteria, fungi and actinomycetes increasing by 25.4%~254.1%, 49.5%~97.5% and 7.3%~54.1%, respectively, compared with CK. ③Application of biochar and nitrogen fertilizer increased jujube yield, with the highest yield 22 052.73 kg/hm2 achieved in B30+ N300, up 28.5% over the CK 【Conclusion】Applying 30 t/hm2 of biochar and 300 kg/hm2 of nitrogen fertilizer appears to be optimal to maximize yield and enhance soil enzymatic activities. |
| Key words: biochar amendment; soil enzymatic activity; microbial community; yield |
|
|
