scholarly journals Effet du substrat sur la biomasse et la fixation symbiotique de l’azote par les plants de Acacia mangium willd. (Fabaceae) en pépinière

2020 ◽  
Vol 14 (5) ◽  
pp. 1618-1632
Author(s):  
Samuel Jobercia Moulambi-Nzonza ◽  
François Mankessi ◽  
Jean Bruno Bassiloua ◽  
Rosalie Matondo
Keyword(s):  
Acacia Mangium ◽  
Mineral Fertilizer ◽  
Black Soil ◽  
Substrate Effect ◽  
Optimum Conditions ◽  
Soil Charcoal ◽  
Growth Performances ◽  
Reduction Assay ◽  
Set Up ◽  
Production Conditions

Acacia mangium Willd est une espèce à croissance rapide, fixatrice d’azote, capable de restituer au sol des éléments minéraux par chute de litière. Elle est actuellement très utilisée dans les programmes de reboisement. L’effet substrat sur la biomasse des plants, à l’âge de plantation, a été estimé dans le but d’optimiser les conditions de production des plants. Un dispositif en blocs complets randomisés comprenant six types de substrats à base de terre noire, charbon et sciure de bois, a été mis en place. Des jeunes plants âgés de trois semaines ont été transplantés dans des plaques alvéolées comprenant différents substrats puis élevés jusqu’à l’âge de plantation. Une dose de 30 g d’engrais NPK dilués dans 10 l d’eau a été apportée quotidiennement aux plants. Les résultats obtenus montrent un effet substrat sur la biomasse et la croissance. Les plants issus des substrats 6 (75% terre+25% charbon) et 4 (50% terre+50% charbon) présentent les meilleures performances de croissance. L’Activité Réductrice d’Acétylène (ARA) réalisée a été influencée par le substrat. La dose de fertilisation apportée n’a pas engendré l’avortement des nodules. Le substrat 5 (50% de terre noire, 25% de charbon et 25% de sciure de bois) offre les conditions optimales de développement des nodules.Mots clés : Substrat, Acacia mangium, biomasse, ARA.   English Title: Effect of substrate on the biomass and the symbiotic fixing of nitrogen by Acacia mangium willd. (Fabaceae) seedlings in the nurseryAcacia mangium Willd is a rapid growth species, fixing of nitrogen and able to restore on the ground biogenic salts through the fall of litter. It’s currently very used in the afforestation programs. The effect of substrate on the seedlings biomass at the plantation age was estimated with the aim of optimizing the seedlings production conditions. A randomized complete blocks of six types of substrate containing black soil, charcoal and sawdust, was set up. Seedlings of three weeks old were transplanted in the alveolate plates with various substrates during the education phase until the age of plantation. 30 g of a mineral fertilizer NPK (20-20-20) diluted in 10 l of water was brought daily to the seedlings. The results showed a substrate effect on the biomass and the plants growth. Seeedlings which growed on the substrate 6 (75% black soil + 25% charcoal) and 4 (50% black soil + 50% charcoal) present the best growth performances. The Acetylene Reduction Assay (ARA) realized was significantly influenced by the types of substrate. Mineral fertilizer brought does not generate the abortion of the nodules. The substrate 5 (black soil 50%, charcoal 25% and sawdust 25%) offered the optimum conditions of nodules development.Keywords: Substrate, Acacia mangium, biomass, ARA.  

scholarly journals An intelligent management system for aquaponics

2021 ◽  
Vol 69 (4) ◽  
pp. 345-350
Author(s):  
Divas Karimanzira ◽  
Thomas Rauschenbach
Keyword(s):  
Food Production ◽  
Large Scale ◽  
Optimum Conditions ◽  
Sustainable Food ◽  
Water Recirculation ◽  
Increase Productivity ◽  
Intelligent Management ◽  
Set Up ◽  
Aquaculture Production ◽  
The Eu

Abstract Population rise, climate change, soil degradation, water scarcity, and food security require efficient and sustainable food production. Aquaponics is a highly efficient way of farming and is becoming increasingly popular. However, large scale aquaponics still lack stability, standardization and proof of economical profitability. The EU-INAPRO project helps to overcome these limitations by introducing digitization, enhanced technology, and developing standardized modular scalable solutions and demonstrating the viability of large aquaponics. INAPRO is based on an innovation a double water recirculation system (DRAPS), one for fish, and the other one for crops. In DRAPS, optimum conditions can be set up individually for fish and crops to increase productivity of both. Moreover, the integration of digital technologies and data management in the aquaculture production and processing systems will enable full traceability and transparency in the processes, increasing consumers’ trust in aquaculture products. In this paper, the innovations and the digitization approach will be introduced and explained and the key benefits of the system will be emphasized.

scholarly journals ZEOLITES AND FERTILIZERS ON THEIR BASIS IN SOYBEAN CULTIVATION TECHNOLOGY IN THE VOLGA FOREST STEPPE

2021 ◽  
Vol 250 ◽  
pp. 88-94
Author(s):  
A. Kh. Kulikova ◽  
◽  
N. G. Zakharov ◽  
N. A. Khairtdinova ◽  
◽  
...  
Keyword(s):  
Amino Acids ◽  
Biological Activity ◽  
Seed Quality ◽  
Mineral Fertilizer ◽  
Field Studies ◽  
Soil Improvement ◽  
Black Soil ◽  
Forest Steppe ◽  
Experimental Field ◽  
Ulyanovsk Region

Experimental field studies were carried out on the experimental field of Ulyanovsk State Agrarian University in 2018-2020. The experiment scheme in 2019 (laid in 2018) consisted of 4 variants: 1. Control (without fertilizers); 2. Zeolite in pure form, 500 kg / ha; 3. Organic mineral fertilizer, obtained by enriching zeolites with amino acids, 500 kg / ha; 4. Zeolite 500 kg / ha + N40 (carbamide at the dose of 40 kg of nitrogen per 1 ha). In 2020, the experiment was supplemented with four variants in order to identify more appropriate doses of fertilization (zeolite enriched with amino acids, 250 kg / ha; zeolite enriched with amino acids, 500 kg / ha; zeolite enriched with carbamide, 250 kg / ha; zeolite enriched with urea , 500 kg / ha). The experiments were carried out in 3-fold repetition with a randomized placement of plots. The effect of zeolite from Yushansk deposit of Ulyanovsk region and fertilizers based on it enriched with amino acids and urea were studied in the experiment, as well as their effect on general biological activity of leached black soil, on its agrochemical parameters, photosynthetic activity of soybean crops, yield and seed quality. A significant influence of experimental fertilizers on biological activity of the soil, improvement of nutrient regime, as well as the ability of zeolite to neutralize soil acidity was found. Improvement of the soil environment in case of application of zeolite enriched with amino acids and urea as a fertilizer contributed to an increase of soybean yields by 6-14% and by 12-31% to improvement of the product quality. With an increase of the dose of fertilizers, the yield of soybean seeds increased, but not proportionally.

scholarly journals Mineral fertilizers as a governing factor of the regulation of the number of fungi in soil

2009 ◽  
pp. 201-207 ◽  
Author(s):  
Marijana Pesakovic ◽  
Dragutin Djukic ◽  
Leka Mandic ◽  
Milan Rakicevic ◽  
Rade Miletic
Keyword(s):  
Soil Fungi ◽  
Mineral Fertilizer ◽  
Mineral Fertilizers ◽  
Nitrogen Rate ◽  
Nutritive Medium ◽  
Governing Factor ◽  
Npk Fertilizer ◽  
Set Up ◽  
The One ◽  
Fertilizer Rates

Over 2003-2005 period, a study was performed on the effect of different rates of NPK fertilizer of formulation 8:16:24 + 3% MgO (N1 - 400 kg ha-1; N2 - 600 kg ha-1; N3 - 800 kg ha-1; N4 - 1000 kg ha-1) on development of the soil fungi. The trial was set up in the experimental plum orchard established by Fruit Research Institute Cacak, and the laboratory of Department of Microbiology, Faculty of Agronomy Cacak. Unfertilized soil was used as the control soil. Each of the stated variants was carried out in three replications. The size of the basic plot was 68 m2. The effect of the studied mineral fertilizer rates was determined three times over the growing season, the number of fungi being checked by the indirect rarefaction method on Chapek nutritive medium. The results of the study inferred that the application of mineral fertilizers brought about the decrease in the number of fungi. Of all studied variants, the one with the highest nitrogen rate (variant N4) exhibited the strongest effect. The influence of the fertilizer was highest at the third sampling. Furthermore, the effect was highest in season 2003.

scholarly journals Optimum Conditions for Phenol Oxidase (Laccase) Production from Azotobacter chroococcum by Submerged Fermentation

2017 ◽  
Vol 11 (1) ◽  
pp. 13-18
Author(s):  
Ali J. R. AL-Sa'ady ◽  
Lamees M.R. Abbas ◽  
Hutaf A.A. ALsalim
Keyword(s):  
Incubation Period ◽  
Incubation Temperature ◽  
Nitrogen Sources ◽  
Phenol Oxidase ◽  
Azotobacter Chroococcum ◽  
Laccase Production ◽  
Optimum Conditions ◽  
Carbon And Nitrogen Sources ◽  
Carbon And Nitrogen ◽  
Production Conditions

Phenol oxidases (laccase), copper-containing oxidase enzymes, are found in many plants, fungi and microorganisms. Many factors that influence laccase production from Azotobacter chroococcum are determined in this study, these factors are: carbon source, nitrogen source, pH, incubation temperature and incubation period. The results showed that the best carbon and nitrogen sources for laccase production are sucrose and yeast extract respectively, and the best factors for laccase production conditions are pH 7.0 with an incubation period of 6 days at temperature 30 Cᵒ.

scholarly journals Environmentally Efficient 316L Stainless Steel Feedstocks for Powder Injection Molding

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1296
Author(s):  
Berenika Hausnerova ◽  
Martin Novak
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
Mass Production ◽  
316L Stainless Steel ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
The Novel ◽  
Efficiency Enhancement ◽  
Optimum Conditions ◽  
Set Up

In this study, environmentally convenient highly metal powder filled feedstocks intended for powder injection molding is presented. The composition of 60 vol % 316L stainless steel gas atomized powder feedstocks containing semicrystalline waxes: acrawax or carnauba wax and paraffin wax, combined with polyethylene glycol and modifier, was optimized to provide defect-free parts. Rheological as well as thermogravimetric analyses supported with scanning electron microscopy and metallography were employed to set up optimum conditions for molding, debinding and sintering. The performance of the novel feedstock was compared with currently available polyolefines-based materials, and results showed an efficiency enhancement due to the substantially lower (about 100 °C) mixing and molding temperatures as well as a reduction of debinding and sintering times at the simultaneous achievement of better mechanical properties in terms of elongation and tensile strength, in comparison to the mass production feedstock.

scholarly journals Utilization of microbial inoculation and compost for revitalization of soils

2009 ◽  
Vol 4 (No. 3) ◽  
pp. 126-130 ◽  
Author(s):  
O. Mikanová ◽  
S. Usťak ◽  
A. Czakó
Keyword(s):  
Plant Growth ◽  
Ammonium Sulphate ◽  
Nitrogenase Activity ◽  
Mineral Fertilizer ◽  
Pot Experiment ◽  
Mineral Fertilizers ◽  
Microbial Inoculation ◽  
Active Population ◽  
Rhizobium Spp ◽  
Set Up

Improving the quality of reclaimed soils requires an active population of microorganisms which can promote plant growth. Increasing the activity of microorganisms can be done by adding nutrients, making agrotechnical soil improvements and by the inoculation of beneficial microorganisms. We investigated the role of fertilizer treatments on plant growth and nitrogen fixation in a pot experiment conducted under green house conditions. Influence of the fertilizer type on numbers of bacteria was also investigated. The seeds were inoculated with the mixture of Azotobacter spp. and Rhizobium spp. The pot experiment was set up with the substrate from the mine spoil (North Bohemia coal basin, the Czech Republic) using Medicago sativa as test plants. The following treatments were used: compost 0, 20, 40, 120, 400, 800 t/ha and mineral fertilizer – ammonium sulphate. The doses of ammonium sulphate were calculated to be equivalent (in nitrogen content) to those doses of compost. Control variants without bacteria inoculation and fertilizers were also included. Inoculation with the mixture of AzotobacterRhizobium spp. significantly increased plant growth and nitrogenase activity. The nitrogenase activity was inhibited by mineral fertilizers in all doses used. The results of the study have proved that compost application stimulated the growth of Azotobacter spp. and Rhizobium spp.

Optimization of Nitrite Reductase Production Conditions in Lactobacillus plantarum from Salted Fish

2013 ◽  
Vol 781-784 ◽  
pp. 1595-1598 ◽  
Author(s):  
Ya Nan Wang ◽  
Yan Yan Wu ◽  
Xian Qing Yang ◽  
Lai Hao Li ◽  
Bo Qi
Keyword(s):  
Enzyme Activity ◽  
Lactobacillus Plantarum ◽  
Nitrite Reductase ◽  
Ph Value ◽  
Evaluation Index ◽  
Optimum Conditions ◽  
Culture Temperature ◽  
Fish Products ◽  
Salted Fish ◽  
Production Conditions

The conditions for nitrite reductase (NiRs) produced by Lactobacillus plantarum from salted fish were optimized. Enzyme activity of nitrite reductase was used as evaluation index. The results showed that the pH value had greatest influence on enzyme activity. The optimum conditions of producing nitrite reductase were inoculate quantity 4 %, pH 6.3, culture temperature 35 °C, incubation time 48 h. The enzyme activity of nitrite reductase reached to 89.672 U/mL, which increased by 71 % after optimization. This work provided the foundation for the research of enzymatic properties of nitrite reductase. This may be useful to the production of salted fish products.

scholarly journals FUNCTIONING OF NITROGEN FIXATION SYMBIOSIS AND PEAS PRODUCTIVITY UNDER THE APPLICATION OF DIFFERENT TYPES AND DOSES OF FERTILIZERS

2016 ◽  
Vol 24 ◽  
pp. 37-42
Author(s):  
L. V. Tsentylo
Keyword(s):  
Nitrogen Fixation ◽  
Mineral Fertilizer ◽  
Crop Productivity ◽  
Black Soil ◽  
Agricultural Practice ◽  
Organic Mineral ◽  
Different Types ◽  
Cultivation Technology ◽  
Sowing Seed

The efficiency of different types and doses of fertilizers and pre-sowing bacterization of pea seeds (Starter variety) on the formation and functioning of symbiotic nitrogen fixation system, crop productivity and protein content in grain was studied in long-term field experiment on the typical black soil for five years. It was shown that fertilizer doses not exceeding N60P60K60 were the most appropriate to use in the cultivation technology of pea. The use of manure, compost and organic-mineral fertilizer in crop rotation had positively affected the productivity of peas. Pre-sowing seed bacterization was proved to be an important agricultural practice as its application increases crop productivity and improves product quality.

The Effect of Different Growing Media on Physical Morphology of Rockmelon (Cucumis Melo Linn cv. Glamour) Seedling

2021 ◽  
Vol 1 (1) ◽  
pp. 17-24
Author(s):  
Muhammad Nasrul Hazzeem Ab Rauf ◽  
Shafeeqa Shahruddin
Keyword(s):  
Plant Height ◽  
Rice Husk ◽  
Cucumis Melo ◽  
Black Soil ◽  
Growing Media ◽  
Number Of Leaves ◽  
Soilless Cultivation ◽  
Set Up ◽  
Cucumis Melo L ◽  
Cucurbitaceae Family

Rockmelon (Cucumis melo L.) belongs to the Cucurbitaceae family, which can adapt to various soil and climate areas, especially in Malaysia. The production of rockmelon in Malaysia has highly declined, and for this reason, farmers have opted to use the concept of soilless cultivation due to it benefits accrued from soilless media such as cocopeat, perlite, and burnt rice husk. The study was carried out to determine the effect of different growing media on the physical morphology of rockmelon seedlings. This experiment was set up using RCBD arrangements with four replications. Different growing media used were: (i) 100% Black Soil (BS), (ii) 75% cocopeat + 15% burnt rice husk + 10% perlite (M1) and (iii) 75% cocopeat + 20% burnt rice husk + 5% perlite (M2). The parameters measured were plant height, number of leaves and total leaves area, and stem girth. The data were collected within two weeks after transplanting. The parameters measured were subjected to ANOVA and LSD was applied to compare means. In this study, rockmelon seedlings treated on BS showed significantly (P<0.001) the highest plant height, number of leaves per plant, and total leaves area and stem girth. Seedlings on soilless M1, however, grew in slightly good conditions, as it showed the insignificantly higher values on morphological parameters measured. Thus, BS is still suitable for better use of media for 15 days old rockmelon seedlings (after transplanting). It gives the optimum conditions for adapting seedlings to the new exposure environment.

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