Bio-composting oil palm waste for improvement of soil fertility

Sources of bio-compost as agro-industrial wastes includes wide range of oil palm wastes viz. waste, biomass, palm kernels, empty fruit bunch, mill effluent, trunk and frond compost. Various composting processes are summarized in brief with distinct reference of oil–palm composting covering aerated static pile, and co-composting with earthworms (vermicomposting). However, in-vessel composting and windrow composting has meritorious advantages in composting. This review article refers to various significant roles played by microorganisms associated. Noteworthy study of bio-compost applications and procedures are correspondingly glosses framework of ecological, economical and agro-ecosystemic benefits

Growth Performance of <i>Hypophthalmichthys molitrix</i> and Barbodes gonionotus Fingerlings by Feeding Microalgae Cultured on Fertilizer Factory Effluent

Growth performance of Hypophthalmichthys molitrix (Silver carp) and Barbodes gonionotus (Sar puti) fingerlings were studied separately in aquaria by feeding cultured microalgae (Chlorella ellipsoidea, Scenedesmus obliquus and Spirulina platensis) in different combinations for a period of 21 days. Fertilizer factory effluent was used to grow these microalgae. Significantly (p&lt;0.05) higher weight gain of H. molitrix (81.16%), was in the treatment T2 (Rearing by feeding 100% S. platensis) and the minimum percentage (- 4.29%) was obtained in the control (fed on fishmeal and mustered oil cake). Specific growth rate (SGR, %/day) of H. molitrix were determined - 0.21 to 2.84 for all the treatments which was significantly (p&lt;0.05) higher in T2. Survival rate of H. molitrix was 25.90 to 77.80%. In the case of B. gonionotus, significantly (p&lt;0.05) higher weight gain (149.10%) was observed in t2 (Rearing by feeding 100% S. platensis). The SGR (%/day) of B. gonionotus were ranged from 2.25 to 4.33 which was significantly (p&lt;0.05) higher in t2 than all other treatment except control. Survival rate of B. gonionotus was ranged from 97.78% to 100%. The reared fingerlings were found nutritionally rich. Key words: Fingerlings; Microalgae; Growth performance; Specific growth rate. DOI: 10.3329/bjsir.v45i4.7328 Bangladesh J. Sci. Ind. Res. 45(4), 315-322, 2010  </jats:p

Growth Performance and Nutritional Analysis of &lt;i&gt;Spirulina platensis&lt;/i&gt; in Different Concentrations of Papaya Skin Powder Media

The growth performance of Spirulina platensis was studied in four different concentrations viz. 0.3, 0.4, 0.5 and 0.6 g/l of papaya (Carica papaya) skin powder media (PSPM) and in control, Kosaric Medium (KM) in triplicate. The initial cell weight of S. platensis was 6.0 mg/l which attained a maximum weight of 913.13 mg/l on the 10th day of culture in the control KM followed by 699.07, 612.13, 538.99 and 377.48 mg/l that grown in 0.40, 0.30, 0.50 and 0.60 g/l of PSPM respectively. Similar trend was observed in the case of chlorophyll a content ranging 3.57 to 8.15 mg/l. The specific growth rate (SGR, μ/day) of S. platensis on the basis of cell weight and chlorophyll a content was recorded in the ranges of 0.41 to 0.50 and 0.41 to 0.49, respectively, for all the treatments. The SGR on the basis of cell weight and chlorophyll a was recorded significantly (p&lt;0.05) higher in KM among all the treatments. On the other hand among the four different concentrations of PSPM, 0.40 g/l showed significantly (p&lt;0.05) higher SGR than others. The pH and other physico-chemical factors were within suitable range of algae culture. The cultured microalga was nutritionally rich. Keywords: Spirulina; Papaya skin; Cell weight ; Chlorophyll a DOI: http://dx.doi.org/10.3329/bjsir.v46i3.9039 BJSIR 2011; 46(3): 333-338</jats:p