Evaluation of Soil and Nutrient Characteristics of Gongronema latifolium Benth Near Palm Oil Mill Sites in Ogoja, Nigeria
Keywords:
Palm oil mill, Soil nutrients, Gongronema latifolium, Organic amendment, Cross River StateAbstract
Gongronema latifolium, a tropical rainforest plant usually used as spice and vegetable as well as a medicinal specie is often cultivated in gardens near palm oil mill sites. The study area is a region characterized by excessive production of organic waste that serve as alternate form of fertilizer, which could be used as soil conditioner to improve soil properties and increase crop yields. This study was conducted to examine the response of the test crop mineral nutrient contents to extreme palm oil mill waste as well as the effects of such condition on the chemical properties of experimental soil. Soil samples (0-20cm depth) and leaf samples of G. latifolium were collected from three (3) sampling locations (P0-control, P1, and P2) in the study area, and analysed for chemical characteristics and nutrient contents, respectively, using standard procedures. The results of this study showed that soil pH significantly decreased (P < 0.05) with increase in distance from the palm oil mill site. The pH values of the experimental soil near the palm oil mill site were relatively alkaline with pH values of 7.40 and 7.20 at P1 and P2, compared to the value of 5.30 recorded at the control. The organic matter, potassium and sodium contents at P1 and P2 were significantly (P < 0.05) higher relative to the control. The values for Effective Cation Exchange Capacity and electrical conductivity at P1 and P2 were comparatively (P < 0.05) higher than that of the control. Conversely, the calcium, phosphorus, magnesium, nitrogen, copper and zinc contents of the control treatment were higher than those of P1 and P2 sampling locations. The contents of potassium (P1-14.32mg/100g, P2-14.10 mg/100g), calcium (P1-23.72mg/100g, P2-22.56mg/100g), magnesium (6.70 mg/100g, P2- 6.38mg/100g) and sodium (11.40mg/100g, P2-11.21mg/100g) in leaves of G. latifolium increased significantly (P < 0.05) at P1 and P2 sampling locations relative to the control. This study showed increased levels of K, Ca, Mg, and Na in soil and plant tissues in soils treated with palm bunch waste, suggesting beneficial impacts on growth and productivity of G. latifolium. This study recommends the use of locally available bio-wastes such as palm oil bunch waste as a sustainable option for soil conservation and improvement in soil fertility in local communities.
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