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Effects of cassava allelochemicals on rubber tree pathogens, soil microorganisms, and soil fertility in a rubber tree-cassava intercropping system

文献类型： 外文期刊

作者： Liu, Zifan 1 ; Liu, Peipei 1 ; An, Feng 2 ; Cheng, Linlin 2 ; Yun, Ting 3 ; Ma, Xiaowei 1 ;

作者机构： 1.Hainan Univ, Coll Trop Crops, Haikou 570228, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Minist Agr & Rural Affairs, Danzhou Investigat & Expt Stn Trop Crops, Rubber Res Inst, Danzhou 571737, Hainan, Peoples R China

3.Nanjing Forestry Univ, Sch Informat Sci & Technol, Nanjing 210037, Peoples R China

关键词： Cassava; Rubber tree; Intercropping; Soil nutrients; Soil enzymatic activity; Soil microorganism; Soil fertility

期刊名称：JOURNAL OF RUBBER RESEARCH （ 影响因子：0.667； 五年影响因子：0.618 ）

ISSN： 1511-1768

年卷期：

页码：

收录情况： SCI

摘要： The rubber tree (Hevea brasiliensis)-cassava (Manihot esculenta) intercropping system is one of the most popular intercropping patterns for small-holder rubber planters. However, this practice is not recommended in some rubber-producing countries, since it is believed that the rubber tree and cassava share some identical pathogens and that the intercropping system will deplete soil fertility. The effects of cassava allelochemicals on rubber tree pathogens have never been reported. Using controlled plate tests, pot tests, and field experiments, this study aimed to assess the possible adverse effects that cassavas may impart to rubber plantations. The results showed: (1) although the leaf extract, decomposed leaf extract and root exudates of cassava inhibited or had no effect on the mycelial growth of the rubber tree pathogenCorynespora cassiicola,10 mg mL(-1)and 100 mg mL(-1)cassava leaf water extracts and testing concentrations of cassava root extraction significantly promoted the mycelial growth of the rubber tree pathogenRigidoporus lignosus, which increased the risk of rubber tree white root disease; (2) the overall soil fertility was increased significantly in the rubber tree-cassava intercropping system. However, the soil phosphorus content was reduced significantly in the field experiment; (3) the average girth of rubber trees was significantly reduced, and the girth uniformity was decreased in the intercropping system. Based on the experiment results, we suggested that an optimised fertiliser recommendation, particularly on the phosphorus amount, should be developed and implemented for the rubber tree-cassava intercropping system. In addition, since the intercropping of cassava will increase the risk ofR. lignosus-induced rubber tree white root disease, which is very hard to prevent and eradicate once rubber trees are infected, the intercropping of cassava in rubber plantation rows should not be recommended in theR. lignosusprevailing areas.

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