Effects of biochar addition on nitrogen uptake of Glycine max and Arachis hypogaea seedlings

doi:10.7523/j.issn.2095-6134.2017.04.009

Abstract

Abstract: ¹⁵N-labeling technique was used to investigate effects of biochar addition (0, 0.5, 2.5, and 10 mg·g^-1) on biomass and nitrogen uptake of Glycine max and Arachis hypogaea seedlings. We found that biochar addition did not significantly alter total biomass of G. max seedlings compared to control, while a significant difference was observed between two higher addition levels. Biochar addition did not change total biomass of A. hypogaea seedlings, but the highest addition level significantly increased its root to shoot ratios. Increased biochar addition substantially reduced uptake of ¹⁵NH₄⁺ and ¹⁵N-glycine by G. max seedlings, but weak effect on uptake of ¹⁵NO₃^- was observed. Biochar addition significantly decreased uptake of ¹⁵NH₄⁺ by A. hypogaea seedlings, but did not significantly affect uptake of ¹⁵N-glycine. In contrast, uptake of ¹⁵NO₃^- by A. hypogaea seedlings increased first and then decreased with biochar addition. This indicates that biochar addition affects nitrogen uptake by crops, but the effect depends on plant species and amount of added biochar. Therefore, species and nitrogen forms should be considered when biochar is used as a management measure for agricultural soil to improve nitrogen use efficiency and crop production.

Key words: biochar, NH₄⁺, NO₃^-, uptake of nitrogen, ¹⁵N labeling

CLC Number:

S154.1

XU Xingliang, FENG Yuqing, CUI Jian. Effects of biochar addition on nitrogen uptake of Glycine max and Arachis hypogaea seedlings[J]. , 2017, 34(4): 471-477.

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