Effect of selected heavy metals on the growth performance and yield of commercially cultivated American oyster mushroom &lt;em&gt;Pleurotus ostreatus&lt;/em&gt;

L D M Zoysa,P C D Perera,S S M Peramunagama,K L W Kumara

doi:10.4038/tare.v23i3-4.5497

Abstract

Mushrooms can accumulate heavy metals from the growth substrates. This study compared the growth and yield performances of commercially grown American Oyster mushrooms (Pleurotus ostreatus) in the presence of different heavy metals in the substrate. The substrate of the mushroom media contained different heavy metals (Cadmium (Cd), Lead (Pb), Arsenic (As), and Mercury (Hg)) in three concentration levels (25, 50, and 75 mg/kg of sawdust). An experiment was carried out in a Complete Randomized Design (CRD) with five replicates. Both growth parameters (total biological efficiency, total colonization time, time for primordial formation, number of fruiting bodies in the first flush, and weekly mycelium growth rate) and yield parameters (weight and the total number of fruiting bodies) of the mushroom were recorded. Three flushes were made during the study period from October to December 2016. All the data were analyzed statistically using ANOVA (p<0.05) and Duncan’s multiple range test by SAS statistical software (version 9.1.3). The results revealed that biological efficiency of Cd, Hg, and Pb metal concentrated mycelium showed significantly higher values at all three different concentration levels compared to As that lowest at 75 mg/kg concerted level. The highest time of primordial formation, the highest total colonization time, and numbers of fruiting body’s development in the first flush was observed at 75 mg/kg level as treated substrate. Further studies are required to find the bioaccumulation of the heavy metal in the mushrooms.

Highlights

Nigeria is a nation that is blessed with good climatic conditions that favour agricultural production
MATERIALS AND METHODS This study was conducted in Oyo State in Southwestern Nigeria, Oyo state was purposively chosen as the study area in southwestern Nigeria because of large participation of rural youth that is involved in soybean production and concentration of agricultural technologies relating to soybean production in the area through National Agricultural Research Institutes (NARIs) and IITA
Socio-economic characteristics of the respondents Results in Table 1 shows that the respondents were predominantly of female (73.0%), this implies that soybean value addition in rural areas is mostly done by the female as a means of livelihood, this might be connected with the fact that the value addition was not labour intensive

Summary

Introduction

Nigeria is a nation that is blessed with good climatic conditions that favour agricultural production. AYINDE JO ET AL: RURAL YOUTH IN SOYBEAN VALUE ADDITION IN NIGERIA. The Nigeria administration policy on agriculture is Agricultural Promotion Policy (APP) in 2015 which is aimed to build an agricultural business with key stakeholders by creating economy capable of job growth, sustainable income-generating export, food creations and economic diversification. The policy focuses on crops value chains such as wheat, maize, soybean and tomatoes, along with building complex linkages between agroindustries and organizations. To attain good health in Nigeria, the importance of protein in the daily meal of every citizen cannot be overlooked. The Food and Agriculture Organization (FAO 2009) stipulated that every individual is expected to consume71g of protein every day. A cheap protein source is a step forward towards promoting good health (Food and Agriculture Organisation-FAO (2009). The tendency is to fall back to plant relatively cheap protein

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Conclusion