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Sampling Size Requirements to Delineate Spatial Variability of Soil Properties for site-specific nutrient management in Rubber Tree Plantations

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Journal of Resources and Ecology 2019年第4期10卷 441-450页

作者： LIN Qinghuo LI Hong LI Baoguo LUO Wei LIN Zhaomu CHA Zhengzao GUO Pengtao Rubber Research Institute Chinese Academy of Tropical Agricultural Sciences Haikou 571101 China Department of Soil and Water Sciences China Agricultural University Beijing 100193 China Haikou Cigar Research Institute China Tobacco Corporation Hainan Provincial Bureau Haikou 571100 China Environment and Plant Protection Institute Chinese Academy of Tropical Agricultural Sciences Haikou 571101 China

site-specific nutrient management is an important strategy to promote sustainable production of rubber trees in order to obtain high yields of natural rubber. Making effective nutrient management decisions for rubber trees depend on knowing the spatial variations of soil fertility properties in advance. In this study the Kriging geostatistical method was used to examine the spatial variability of soil total nitrogen(TN), organic matter(OM), available phosphorus(AP) and available potassium(AK) in a typical hilly rubber tree plantation in Hainan, China. The spatial variability of the soils was small for the TN and OM and had medium variability for the AP and AK variables. Anisotropic semivariograms of all soil properties revealed that elevation and building contour ledge can profoundly affect the spatial variability of soil properties in the plantation, except for the AK variable. Soil samples had to be collected in alignment with the direction of elevation and perpendicular to the direction of building contour ledges, which was needed to obtain more reliable information within the study area in the rubber tree plantation. In formulating a sample scheme for AK, the distribution features of the soil’s parent material should be considered as the influence factor in the study field. The Kriging method used to guide the soil sampling for spatial variability dertermination of soil properties was about 2-5 times more efficient than the classic statistical method.

关键词： hevea brasiliensis soil sampling size spatial soil variability anisotropic semivariogram site-specific nutrient management

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A NEW APPROACH TO INCREASE THE ATTAINABLE RICE YIELD IN INTENSIVE IRRIGATED RICE SYSTEMS OF ZHEJIANG PROVINCE, CHINA

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2001年第2期2卷 76-83页

作者：王光火傅荣兴孙庆祖 Dept. of Natural Resources Zhejiang University Hangzhou China International Rice Research Inst. Makati City Philippines Jinhua Agricultural Bureau Jinhua China

A new site-specific nutrient management approach was developed to break the apparent attainable yield barrier of 6 t\5ha\+\{-1\} in the double rice cropping system of Zhejiang. On-farm experiments involving 21 rice-growing farmer families and NPK long-term experiments commenced in 1997 in the central part of Zhejiang Province to assess the status of soil fertility and productivity under intensive rice-rice cropping. A new site-specific nutrient management (SSNM) approach has been developed for this studied area. Field-specific fertilizer recommendations are calculated considering indigenous nutrient supply, reasonable grain yield targets and corresponding nutrient demand, nutrient balance and nutrient use efficiency, as well as socio-economic factors. The agronomic performance of SSNM was tested against the farmer’s fertilizer practice (FFP) in four 1998-1999 cropping seasons. Across seasons and years, SSNM consistently increased plant nutrient uptake, grain yield and profit by about 10%-15% compared to the FFP. Yield levels of 7.5 t \5ha\+\{-1\} or more seem achievable and sustainable through introduction of SSNM and improved extension services in Zhejiang Province.

关键词： rice yield potential nutrient efficiency site-specific nutrient management

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