Abstract

Studying the spatial distribution characters of rubber yield and soil nutrients and the rule of spatial variability are important for suitable fertilization strategy in rubber plantation. This paper selected Hongquan Branch, Guangba Branch and Gongai Branch of Guangba Farm in Hainan province as study area and total of 327 samples were selected in the rubber plantation. The spatial distribution characters of rubber yield and five soil nutrients, including organic matter (OM), total nitrogen (TN), available phosphorus (AP), available potassium (AK), exchangeable calcium (Ga), were studied using traditional analysis method and geo-statistics analysis method. The results showed that: (1) The average value of rubber yield was 3.55 kg/hm2 with moderate spatial variability and the average values of OM, N, P, K and Ga were 11.65 g/kg, 0.07%, 16.23 mg/kg, 49.65 mg/kg and 84.44 mg/kg, respectively. Soil OM, TN, AK and Ga had moderate spatial variability but AP had strong spatial variability. (2) Rubber yield and soil total nitrogen (N) nutrient had strong spatial dependence; soil OM, AP, AK and Ga had moderate spatial dependence. (3) Based on the previous reports of normal range of soil nutrients, soil OM and TN nutrient content were very low in the studied rubber plantation of Guangba Farm. Therefore, more nitrogen fertilizer should be applied in the rubber plantation in future.

Highlights

  • Rubber plantation soil is an important resource of nutrient for rubber tree, the fertility condition is closely related to rubber growth and production

  • Yang [2] showed that soil available potassium (AK) and total potassium (TK) had strong spatial dependence; soil available nitrogen (AN), total nitrogen (TN), available phosphorus (AP), total phosphorus (TP), pH and organic matter (OM) had moderate spatial dependence in Lanyang Town rubber plantation

  • The results showed that the levels of soil organic matter (OM) and total nitrogen (TN) nutrient in the studied rubber plantation were very low

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Summary

Introduction

Rubber plantation soil is an important resource of nutrient for rubber tree, the fertility condition is closely related to rubber growth and production. Studying the spatial distribution characters of rubber yield and soil nutrients and the rule of spatial variability are important to formulate a suitable fertilization strategy in rubber plantation. Yang et al [1] pointed out that both soil total potassium and available potassium had moderate spatial dependence in rubber plantation of Danzhou city. Yang [2] showed that soil available potassium (AK) and total potassium (TK) had strong spatial dependence; soil available nitrogen (AN), total nitrogen (TN), available phosphorus (AP), total phosphorus (TP), pH and organic matter (OM) had moderate spatial dependence in Lanyang Town rubber plantation. Qin et al [3] showed that both soil total phosphorus and available phosphorus at the depth of 0-20cm and 20-40cm had moderate spatial dependence in rubber plantation of Qiongzhong County. The spatial distribution characters of soil nutrients should be studied for the specific research areas

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