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Reinforcing Nitrogen Nutrition Through Partial Substitution with Organic Nitrogen Enhances the Properties of Natural Rubber

文献类型： 外文期刊

作者： Jin, Dongqi 1 ; Cha, Zhengzao 2 ; Li, Jianhong 2 ; Huang, Yanyan 2 ; Yang, Hongzhu 2 ; Liu, Hailin 2 ; Luo, Wei 2 ; Lin, Qinghuo 2 ;

作者机构： 1.Hainan Univ, Sch Trop Agr & Forestry, Haikou 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Peoples R China

3.Hainan Observat & Res Stn, Danzhou Soil Environm Rubber Plantat, Danzhou 571737, Peoples R China

关键词： rubber tree; organic nitrogen fertilizer substitution; nitrogen nutrient; natural rubber properties

期刊名称：FORESTS （ 影响因子：2.5； 五年影响因子：2.7 ）

ISSN：

年卷期： 2024 年 15 卷 11 期

页码：

收录情况： SCI

摘要： The partial substitution of chemical fertilizer with organic fertilizer is a crucial practice for enhancing crop production and quality, although its impact on natural rubber has rarely been explored. In this study, a two-year field experiment was conducted to investigate the impact of different nitrogen application rates and varying proportions of organic nitrogen substitution on dry rubber yield, nitrogen nutrition, and natural rubber properties. Regarding nitrogen application, the control treatment received no nitrogen amendment, while the low-nitrogen treatment was amended with 138 gtree-1year-1 of nitrogen. The medium-nitrogen treatment received 276 gtree-1year-1 of nitrogen, and the high-nitrogen treatment received 552 gtree-1year-1 of nitrogen. In addition, the low-organic-nitrogen substitution treatment and medium-organic-nitrogen substitution treatment were amended with 276 gtree-1year-1 of nitrogen each. The results demonstrated that the 50% organic nitrogen substitution treatment resulted in the highest dry rubber yield across all sampling periods, ranging from 46.43 to 94.65 gtree-1. Additionally, this treatment exhibited superior soil total nitrogen (1067.69 mgkg-1), available nitrogen (84.06 mgkg-1), and nitrogen content in roots (1.08%), leaves (3.25%), fresh rubber latex (0.27%), and raw natural rubber (0.44%) compared with other treatments. In terms of the physical properties of natural rubber, the 50% organic nitrogen substitution treatment resulted in advantages in the weight-average molecular weight (1.57 x 106 gmol-1), number-average molecular weight (0.36 x 106 gmol-1), plasticity retention index (97.35%), Wallace plasticity (40.25), and Mooney viscosity (81.40). For mechanical properties, natural rubber from the substitution treatment exhibited higher tensile strength (19.84 MPa), greater elongation at break (834.75%), and increased tear strength (31.07 Nmm-1). Overall, the substitution of 50% chemical nitrogen fertilizer with organic nitrogen fertilizer improved nitrogen nutrition in rubber trees by introducing organic nitrogen input, resulting in remarkable enhancements in natural rubber properties. Therefore, the incorporation of organic fertilizer as a substitution for 50% of chemical fertilizer is demonstrated as an effective strategy for improving both the yield and properties of natural rubber.

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