Potential of Indigenous Microorganisms (IMO) from cow manure, elephant grass, Aloe vera, pineapple skin to the N, P and K content of organic cow manure

The manufacture of organic fertilizers can be accelerated by adding indigenous microorganisms (IMO) which function as decomposers. The purpose of this study was to determine the effect of adding several types of IMO to the N, P, and K content of organic cow manure. This research used animal MOL, namely cow manure IMO and vegetable IMO, namely elephant grass IMO, Aloe vera IMO, pineapple skin IMO and dry cow manures. This study used an experimental method with a completely randomized design with five treatments and four replications. The treatments were A: addition of cow manure IMO, B : elephant grass IMO, C : Aloe vera IMO, D : pineapple skin IMO, E : combination IMO (A, B, C, D). The parameters were measured; the N, P and K content. The results showed that the addition of several types of IMO had a significant effect (P<0.05) on phosphorus content of organic cow manure but had no significant effect (P>0.05) on nitrogen and potassium content. The manufacture of organic cow manure with the addition of several types of IMO for 21 days gave the best results in the combination IMO treatment with 1.70% nitrogen, 0.65% phosphorus, and 1.78% potassium content.

Enhanced Phytoremediation of Bisphenol A in Polluted Lake Water by Seedlings of Ceratophyllum demersum and Myriophyllum spicatum from In Vitro Culture

Bisphenol A (BPA) is a typical endocrine disruptor that causes problems in waters all around the world. In this study, the effects of submerged macrophytes (Ceratophyllum demersum and Myriophyllum spicatum) cultured in vitro on the removal of BPA at two initial concentrations (0.5 mg L−1 vs. 5.0 mg L−1) from Donghu lake water were investigated, using different biomass densities (2 g L−1 vs. 10 g L−1) under different nutrient conditions (1.85 mg L−1 and 0.039 mg L−1 vs. 8.04 mg L−1 and 0.175 mg L−1 of the total nitrogen and phosphorus concentration, respectively), together with the effect of indigenous microorganisms in the water. The results showed that indigenous microorganisms had limited capacity for BPA removal, especially at higher BPA initial concentration when its removal rate amounted to about 12% in 12 days. Addition with plant seedlings (5 cm in length) greatly enhanced the BPA removal, which reached 100% and over 50% at low and high BPA initial concentration in 3 days, respectively. Higher biomass density greatly favored the process, resulting in 100% of BPA removal at high BPA initial concentration in 3 days. However, increases in nutrient availability had little effect on the BPA removal by plants. BPA at 10.0 mg L−1 significantly inhibited the growth of M. spicatum. Therefore, C. demersum may be a candidate for phytoremediation due to greater efficiency for BPA removal and tolerance to BPA pollution. Overall, seedlings of submerged macrophytes from in vitro culture showed great potential for use in phytoremediation of BPA in natural waters, especially C. demersum.