Consequences of nitrogen mineralization dynamics for soil health restoration of degraded tea-growing soil using organic amendments

IF 1.7 4区 农林科学 Q2 Agricultural and Biological Sciences Chilean Journal of Agricultural Research Pub Date : 2022-06-01 DOI:10.4067/s0718-58392022000200199
Mahesh Liyanage, M. Hanafi, M. Sulaiman, R. Ismail, G. Gunaratne, Saman Dharmakeerthi, Geethika Rupasinghe, A. Mayakaduwa
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Abstract

Understanding of N mineralization dynamics of frequently available organic amendments in the tea ( Camellia sinensis (L.) O. Kuntze) ecosystem has greater importance in land restoration. Hence, this study focused on assessing the effects of organic amendments on N mineralization and soil quality improvement in tea growing soil. Garden compost (CMP), Gliricidia ( Gliricidia sepium (Jacq.)) leaves (GLI), charged tea waste biochar (CBC), tea waste (TW), and tea waste biochar without charging (RBC) were incubated with soil at a rate of 186 mg N kg -1 . Incubated soils were analyzed periodically for soil pH, available NO 3 - -N, NH 4 + -N, soil P, and S for 120-d. Microbial biomass C (MBC), protease, urease, phosphatase, and dehydrogenase activities were determined at the end of the incubation. All amendments showed different N mineralization patterns. Gliricidia , CMP, and TW released N by 94%, 43%, and 24%, respectively. Gliricidia showed the highest peak of NH 4 + -N after 21-d incubation, depicting rapid ammonification. Charged BC and RBC showed N immobilization throughout the incubation period, which finally amounted to 12% and 17%, respectively. Gliricidia showed 0.79 mg d -1 maximum N mineralization rate and 150 mg kg -1 total mineralizable N. The N mineralization was sequenced as GLI > CMP > TW > CBC > RBC. All amendments showed more than 45% increase in MBC, where Gliricidia gave the highest (146%) compared to the control. Application of CBC promotes all enzyme activities by > 90% over control. In conclusion, GLI meets the immediate plant N requirement, and CBC significantly improves the degraded soil quality.
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有机改良剂对退化茶园土壤氮矿化动态的影响
了解茶树生态系统中常用有机改良剂的氮矿化动态对土地恢复具有重要意义。因此,本研究旨在评估有机改良剂对茶园土壤氮矿化和土壤质量改善的影响。将花园堆肥(CMP)、胶质菌(Gliricidia sepium(Jacq.))叶(GLI)、带电的茶渣生物炭(CBC)、茶渣(TW)和未带电的茶废生物炭(RBC)与土壤以186 mg N kg-1的速率孵育。对培养土壤的pH值、有效NO3--N、NH4+-N、土壤P和S进行周期性分析,分析时间为120d。培养结束时测定微生物生物量C(MBC)、蛋白酶、脲酶、磷酸酶和脱氢酶活性。所有改良剂均表现出不同的N矿化模式。胶质菌、CMP和TW分别释放了94%、43%和24%的氮。Gliricidia在培养21 d后出现NH4+-N的最高峰值,表现为快速氨化。带电的BC和RBC在整个培养期内表现出氮的固定化,最终分别达到12%和17%。Gliricidia的最大氮矿化率为0.79 mg d-1,总可矿化氮为150 mg kg-1。氮矿化顺序为GLI>CMP>TW>CBC>RBC。所有修正案都显示MBC增加了45%以上,与对照组相比,Gliricidia的MBC最高(146%)。CBC的应用使所有酶活性比对照组提高了90%以上。总之,GLI满足了植物对氮的直接需求,CBC显著改善了退化的土壤质量。
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来源期刊
CiteScore
3.00
自引率
11.80%
发文量
60
审稿时长
6 months
期刊介绍: ChileanJAR publishes original Research Articles, Scientific Notes and Reviews of agriculture, multidisciplinary and agronomy: plant production, plant protection, genetic resources and biotechnology, water management, soil sciences, environment, agricultural economics, and animal production (focused in ruminant feeding). The editorial process is a double-blind peer reviewing, Editorial Office checks format, composition, and completeness, which is a requirement to continue the editorial process. Editorial Committee and Reviewers evaluate relevance and scientific merit of manuscript.
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