scholarly journals The Controlled-release Phosphorus Fertilizer with Silica from Rice Husk

2021 ◽  
Vol 20 (2) ◽  
pp. 43-51
Author(s):  
Patcharaporn Pimchan ◽  
Pornpan Tana ◽  
Rattanaporn Kongprom ◽  
Sirinan Pimulkan ◽  
Ammara Thaotho ◽  
...  
Keyword(s):  
Controlled Release ◽  
Rice Husk ◽  
Phosphorus Fertilizer

scholarly journals Characterization of Nitrogen Release in Modified Controlled-Release-Fertilizer using Rice Husk Biochar

2020 ◽  
Vol 11 (4) ◽  
pp. 774
Author(s):  
Himawan Tri Bayu Murti Petrus ◽  
Andreas Diga Pratama Putera ◽  
Inasanti Pandan Wangi ◽  
Muhammad Aulia Ramadhian ◽  
Hendrik Setiawan ◽  
...  
Keyword(s):  
Controlled Release ◽  
Rice Husk ◽  
Nitrogen Release ◽  
Controlled Release Fertilizer ◽  
Rice Husk Biochar

scholarly journals Controlled Release of Biological Control Agents for Preventing Aflatoxin Contamination from Starch–Alginate Beads

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1858 ◽  
Author(s):  
Jiachang Feng ◽  
Jianpeng Dou ◽  
Zidan Wu ◽  
Dongxue Yin ◽  
Wenfu Wu
Keyword(s):  
Controlled Release ◽  
Rice Husk ◽  
Entrapment Efficiency ◽  
Alginate Beads ◽  
Aflatoxin Contamination ◽  
Release Profile ◽  
Release Behavior ◽  
Biological Control Agents ◽  
Scanning Electron Micrograph ◽  
Powder Content

For the wise use of fungal biocontrol and metalaxyl fungicide, starch–alginate-based formulations have been developed by encapsulating metalaxyl and non-toxigenic Aspergillus flavus spores simultaneously in the form of microspheres using calcium chloride as a cross-linking agent. The formulations were characterized by Fourier transform infrared spectroscopy (FTIR), a scanning electron micrograph (SEM), and thermogravimetry (TGA). Formulation characteristics, including the bead size, entrapment efficiency, swelling ratio of the beads, and rheological properties, were analyzed. The release behavior of beads with different formulations was evaluated. The addition of kaolin and rice husk powder in starch–alginate beads retarded the release profile of spores and metalaxyl. The release of the active ingredient from starch–alginate–kaolin beads and starch–alginate–rice husk powder beads occurred in both a controlled and sustained manner. Additionally, the release rate decreased with the increase of kaolin or rice husk powder content. The beads added with kaolin were slower than the release of rice husk powder. In comparison, spores released slower and lasted longer than metalaxyl. The starch–alginate–kaolin formulations could be used as controlled release material in the field of biocontrol and reduce the harm of fungicides to the environment.

scholarly journals SUBSTRATE AND FERTILIZATION IN THE QUALITY OF Myrocarpus frondosus SEEDLINGS

FLORESTA ◽  
2019 ◽  
Vol 49 (4) ◽  
pp. 831
Author(s):  
Suelen Carpenedo Aimi ◽  
Maristela Machado Araujo ◽  
Maria Helena Fermino ◽  
Luciane Almeri Tabaldi ◽  
Thairini Claudino Zavistanovicz ◽  
...  
Keyword(s):  
Controlled Release ◽  
Rice Husk ◽  
Native Species ◽  
Dry Mass ◽  
Stem Diameter ◽  
Controlled Release Fertilizer ◽  
Physiological Variables ◽  
Fluorescence Maximum ◽  
Randomized Design

 Myrocarpus frondosus is a native species with high commercial timber value. Thus, the objective of this research was to evaluate the quality of seedlings of Myrocarpus frondosus in the nursery and to indicate the most adequate substrate and fertilization for the production of seedlings. The experiment was conducted in a completely randomized design, with four replications, in a factorial scheme, composed of four combinations of substrates: S1-100% commercial substrate (CS); S2 - 80% CS and 20% carbonated rice husk (CRH); S3 - 60% CS and 40% CRH; S4 - 40% CS and 60% CRH, and four fertilizations: NF – No fertilization; CRF – controlled release fertilizer (ammonium sulfate, simple superphosphate and potassium chloride); RRF – ready release fertilizer and micronutrients. Physical and chemical analyses were performed on the substrate. At 300 days after emergence, the following morphological variables were evaluated: (height, stem diameter, H/SD ratio, leaf area, root length, aerial dry mass, root dry mass, total dry mass, Dickson quality index) and the physiological variables chlorophyll a, chlorophyll b, carotenoids, initial fluorescence, maximum fluorescence, Fv/Fm ratio and electron transport rate). Regardless of the substrate and fertilization, slow growth of the species was observed, even for the best treatment, which was verified from the height (17.87 cm) and stem diameter (2.62 mm). The use of the commercial substrate (40%) with carbonated rice husk (60%) associated with the concentration of 6 g L-1 of controlled release fertilizer is recommended, since they present the best results for the morphological and physiological variables in the nursery in general.

Controlled release antibiotics for dry powder lung delivery

2009 ◽  
Vol 00 (00) ◽  
pp. 090805050810080-8 ◽  
Author(s):  
Handoko Adi ◽  
Paul Michael Young ◽  
Hak-Kim Chan ◽  
Rania Salama ◽  
Daniela Traini
Keyword(s):  
Controlled Release ◽  
Dry Powder ◽  
Lung Delivery

Phosphorus fertilization in inbred and hybrid rice

1970 ◽  
Vol 19 (2) ◽  
pp. 181-187
Author(s):  
MR Islam ◽  
PK Saha ◽  
SK Zaman ◽  
MJ Uddin
Keyword(s):  
Grain Yield ◽  
Key Words ◽  
Hybrid Rice ◽  
Phosphorus Fertilization ◽  
Phosphorus Fertilizer ◽  
Yield Difference ◽  
P Balance ◽  
Rice Genotypes ◽  
Boro Rice

Five phosphorus rates (0, 5, 10, 20 and 30 kg P/ha) were tested with four rice genotypes in Boro (BRRI dhan36, BRRI dhan45, EH1 and EH2) and T. Aman (BRRI dhan30, BRRI dhan49, EH1 and EH2) season. Phosphorus rates did not influence grain yield irrespective of varieties in T. Aman season while in Boro season P response was observed among the P rates. Application of P @ 10 kg/ha significantly increased the grain yield. But when P was applied @ 20 and 30 kg P/ha, the grain yield difference was not significant. The optimum and economic rate of P for T. Aman was 20 kg P/ha but in Boro rice the optimum and economic doses of P were 22 and 30 kg/ha, respectively. Hybrid entries (EH1 and EH2) used P more efficiently than inbred varieties. A negative P balance was observed up to 10 kg P/ha. Key words: Response; Phosphorus fertilizer; Inbred; Hybrid rice DOI: http://dx.doi.org/10.3329/dujbs.v19i2.8962 DUJBS 2010; 19(2): 181-187

Controlled Release of Metformin Hydrochloride I. In vitro Release from Physical Mixture Containing Xanthan Gum as Hydrophilic Rate Retarding Polymer

1970 ◽  
Vol 4 (1) ◽  
Author(s):  
Mashkura Ashrafi ◽  
Jakir Ahmed Chowdhury ◽  
Md Selim Reza
Keyword(s):  
Controlled Release ◽  
Xanthan Gum ◽  
In Vitro Release ◽  
Correlation Coefficients ◽  
High Ratio ◽  
Water Soluble ◽  
Metformin Hydrochloride ◽  
Model Drug ◽  
Very High

Capsules of different formulations were prepared by using a hydrophilic polymer, xanthan gum and a filler Ludipress. Metformin hydrochloride, which is an anti-diabetic agent, was used as a model drug here with the aim to formulate sustained release capsules. In the first 6 formulations, metformin hydrochloride and xanthan gum were used in different ratio. Later, Ludipress was added to the formulations in a percentage of 8% to 41%. The total procedure was carried out by physical mixing of the ingredients and filling in capsule shells of size ‘1’. As metformin hydrochloride is a highly water soluble drug, the dissolution test was done in 250 ml distilled water in a thermal shaker (Memmert) with a shaking speed of 50 rpm at 370C &plusmn 0.50C for 6 hours. After the dissolution, the data were treated with different kinetic models. The results found from the graphs and data show that the formulations follow the Higuchian release pattern as they showed correlation coefficients greater than 0.99 and the sustaining effect of the formulations was very high when the xanthan gum was used in a very high ratio with the drug. It was also investigated that the Ludipress extended the sustaining effect of the formulation to some extent. But after a certain period, Ludipress did not show any significant effect as the pores made by the xanthan gum network were already blocked. It is found here that when the metformin hydrochloride and the xanthan gum ratio was 1:1, showed a high percentage of drug release, i.e. 91.80% of drug was released after 6 hours. But With a xanthan gum and metformin hydrochloride ratio of 6:1, a very slow release of the drug was obtained. Only 66.68% of the drug was released after 6 hours. The percent loading in this case was 14%. Again, when Ludipress was used in high ratio, it was found to retard the release rate more prominently. Key words: Metformin Hydrochloride, Xanthan Gum, Controlled release capsule Dhaka Univ. J. Pharm. Sci. Vol.4(1) 2005 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

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