Short-term effects of organic amendments on soil fertility and root growth of rubber trees on Hainan Island, China
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ORIGINAL PAPER
Short‑term effects of organic amendments on soil fertility and root growth of rubber trees on Hainan Island, China Yanyan Huang1 · Yudan Jing1 · Meirong Bei1 · Hongzhu Yang1 · Zhengzao Cha1 · Qinghuo Lin1 · Wei Luo1
Received: 6 November 2018 / Accepted: 28 February 2019 © The Author(s) 2019
Abstract Rubber [Hevea brasiliensis (Willd. ex A.Juss.) Müll.Arg.] plantations are the largest cultivated forest type in tropical China. Returning organic materials to the soil will help to maintain the quality and growth of rubber trees. Although many studies have demonstrated that organic waste materials can be used to improve soil fertility and structure to promote root growth, few studies have studied the effects of organic amendments on soil fertility and root growth in rubber tree plantations. Here, bagasse, coconut husk or biochar were applied with a chemical fertilizer to test their effects on soil properties after 6 months and compared with the effects of only the chemical fertilizer. Results showed that the soil organic matter content, total nitrogen, available phosphorus and available potassium after the chemical fertilizer (F) treatment were all significantly lower than after the chemical fertilizer + bagasse (Fba), chemical fertilizer + coconut husk (Fco) or chemical fertilizer + biochar (Fbi) (p Fbi > F. Root activity after Fba, Fco and Fbi treatments was 1.8-, 1.9- and 1.4-fold higher than in F treatment and for number of root tips was 3.3-, 4.6- and 4.9-fold higher (p Fba with significant differences among treatments (p
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