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Various reports showed that xanthan production is largely controlled by phosphorus content in cultivation medium, and that phosphorus is commonly added in the form of phosphate salts. This paper presents an investigation into the effects of various K-2 HPO 4 concentrations in waste glycerol-based medium on xanthan production using Xanthomonas strain PL 4 isolated from pepper leaves, which includes pepper leaves. The increase of K 2 HPO 4 concentration in medium from 0 g/L to 2. 50 g/L is significant to the increase in xanthan quantity and molecular weight, according to the obtained results, though a statistically insignificant effect on these parameters. A high production of xanthan of good quality was achieved on medium with optimum K 2 HPO 4 concentration, as well as a relatively high rate of phosphorus conversion.
Source link: https://zenodo.org/record/6925081
During rabi, 2020, an investigation was carried out on clay loam soil at Agricultural Research Station in Adilabad, with the intention of finding the residual effect of soybean, direct effect of nitrogen and phosphorus management on economics, and nutrient balance of chickpea crop. Results at harvest revealed the highest seed and stover yield ever recorded with the use of the entire recommended dose of fertilizer i. e. , application of 100 percent RDF. With the use of Rhizobium@ 25 g kg -1 seed + PSB @ 5 kg ha -1 + 75% RDP and 75% RDP, the highest B: C ratio has been reached since the first B:C ratio was established.
Source link: https://zenodo.org/record/6891602
The purpose of the investigation was to determine the effect of mixing ratios and Hydraulic Reaction Time on Phosphorus recovery from sewage activated sludge during pre-treatment of anaerobic co-digestion to chemical precipitation processes. Mg/Ca, Mg/P, Ca/P, Fe/P, and Fe/P were found in the anaerobic co-digestion pretreatment scheme in comparison to anaerobic digestion pretreatment system. According to results, recoverable P from urinal wastewater can be used to produce fertilizer for agricultural cultivation by using common ion precipitation and adsorption techniques.
Source link: https://zenodo.org/record/6869055
ABSTRACT The number of the harmful algal blooms in western Lake Erie is largely correlated with agricultural phosphorus loading from tributaries, according to ABSTRACT. In this paper, two farmer surveys were used to see if farmers in the Lake Erie region comply with P fertilizer guidelines, and we also look at historic and recent P management guidelines issued by the scientific community and agricultural industry. The majority of farmers use P fertilizers at or below the latest fertility guidelines. Although crop Puptake mechanisms have not changed, these agronomic changes have affected P cycling in soil and water, and water. To establish a sustainable agricultural system in the Western Lake Erie Basin that produces essential commodities while also protecting the environment, improved understanding, reconsideration of traditional guidelines, and widespread farmer adoption of the most effective techniques are required.
Source link: https://zenodo.org/record/6856630
ABSTRACT nitrogen and phosphorus can reduce autotrophic and heterotrophic metabolism in lotic ecosystems, but the majority of studies that examine biotic responses to colimitation emphasize on patch-scale rather than stream-scale responses. We then used steady-state injections to raise background stream water concentrations of one nutrient and released instantaneous pulses of the other nutrient. In this colimited stream, we predicted that increasing the background concentration of one nutrient would result in a shorter ambient risetake length and a higher maximum areal uptake rate of the other nutrient. During the majority pulse nutrient additions, most pulse nutrient additions, Walker Branch sediments had a high adsorption capacity and were likely a sink for P. However, it may be difficult to determine biotic uptake of N and P in streams with high P adsorption potential using coupled pulse nutrient additions.
Source link: https://zenodo.org/record/6856442
ABSTRACT: We investigated the coupling between carbon and phosphorus cycling in a human-altered stream by performing a whole-ecosystem transformation of the labile dissolved organic carbon pool in a nitrate-rich stream in the midwestern United States. From day 1 to day 6, Alkaline phosphatase production increased from day 1 to day 6, but with the NH 4+ addition, water column P uptake only increased on day 6 concurrently. These results showed that heterotrophs outnumbered autotrophs for N and that sediment-sorbed P maintained the heterotrophic community during the DOC extension, and that sediment-sorbed P maintained the heterotrophic community, although autotrophs dominating Puptake from the water column was dominated by autotrophs. Despite the high ambient NO 3 + concentrations, P cycling appeared to be N limited, prompting both APA and P uptake by the simultaneous DOC and NH 4 + addition; this indicates a significant preferential uptake of NH 4+ over NO 3 -.
Source link: https://zenodo.org/record/6835628
ABSTRACT IN Several areas of the Great Lakes has been debating the emergence of deadly algal blooms and heavy growth of Cladophora in recent years. Management of non-point or diffuse sources of phosphorus will be more important in the future, according to an analysis that has emerged from these discussions in order to handle signs of eutrophication in the nearshore. To minimize non-point P losses from agriculture, land management has also changed. Although these improvements have reduced sediment and particulate P loading in several Ohio tributaries, the more bioavailable, dissolved P forms have increased. As there is incomplete information about the mechanisms that are fueling algal growth, it could be difficult to show improvements in water quality in the near term with further P reductions than agriculture alone.
Source link: https://zenodo.org/record/6834229
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