Biochar application is considered a potential approach to mitigating greenhouse gas emissions (GHGs) from the agricultural sector and improving soil physicochemical properties. Thus, we conducted field experiment examine efficacy of biochar rates in combination with water management practices on methane (CH4) nitrous oxide (N2O) carbon increment Vietnamese Mekong Delta (VMD). Rice husk (RB) Melaleuca (MB) were incorporated topsoil (0–20 cm) at 5 10 Mg ha−1, followed by regimes continuous...

<ns3:p><ns3:bold>Background</ns3:bold>: Biochar is a promising material in mitigating greenhouse gases (GHGs) emissions from paddy fields due to its remarkable structural properties. Rice husk biochar (RhB) and melaleuca (MB) are amendment materials that could be used potentially reduce the Vietnamese Mekong Delta (VMD). However, their effects on CH<ns3:sub>4</ns3:sub> N<ns3:sub>2</ns3:sub>O soil under local water management conventional rice cultivation have not been thoroughly...

Biogas digestive effluent (BDE) is a nutrient-enriched source that can be utilized as an organic fertilizer for rice cultivation without synthetic (SF) application. However, primary concern the stimulation of methane (CH4) emissions due to enrichment labile carbon, favorite substrate methanogenic archaea. Methanotrophs potentially reduce greenhouse gas (GHG) from fields owing metabolizing CH4 carbon and energy. We therefore examined effect application methanotroph-inoculated BDE cultivated...

The present study contributes information to the testicular development and reproductive aspects of Glossogobius giuris (Hamilton 1822), one target fishes in Mekong Delta. Trawl nets were used monthly collect fish specimens from January December 2020 four sites along Bassac River, Cai Rang, Can Tho (CRCT) Long Phu, Soc Trang (LPST), Hoa Binh, Bac Lieu (HBBL) Dam Doi, Ca Mau (DDCM). Data analysis 632 individuals showed that five-stage sperm was found testis histological slides. At stage IV...

This study supplies knowledge on the reproductive traits of Glossogobius aureus, one commercial fishes living in brackish water and freshwater. A collection 742 G. aureus specimens was caught using gill nets from January to December 2020. The results gonadal breeding frequency gonadosomatic indices showed that spawned year-round, but with higher activity during four months, August October, wet season. Size at first maturity (Lm) males than females all sites. batch fecundity (F) 1044–27,349...

This study investigates the ovarian development, spawning patterns, maturity size and fecundity of goby

Livestock production plays a leading role in agricultural land-use change. Producing biogas from livestock waste and subsequently using the effluent as fertilizer for crops is promising option to solve environmental problems resulting expanding production. However, it difficult promptly accurately measure nitrogen (N) concentration of farmers developing countries, making precise N management difficult. The objectives current study were (1) evaluate feasibility variable-timing, fixed-rate...

Glossogobius sparsipapillus is one of the gobies that inhabits brackish and freshwater regions in Mekong Delta. However, data on biological parameters this species population are limited. Therefore, present study aims to provide necessary knowledge fishing status goby living (Cai Rang, Can Tho: CR) water (Long Phu, Soc Trang: LP). Data analysis results 1379 individuals showed males outnumbered females LP (374 males: 288 females); reverse case was found CR (351 366 females). There were...

The use of small-scale biogas digesters among farmers and households in rural areas developing countries is a well-known technology. potential for these probably much larger than presently exploited therefore more knowledge on factors that may further the needed. present study draws data from two extensive surveys Mekong Delta with questionnaires one hundred respondents, respectively, collected personal interviews all cases. empirical evidence shows technology well known if purpose to expand...

This study evaluated biogas production potentials from local biomass feedstocks comprising of rice straw (RS), steamed lemongrass (SL), bagasse (BA) and desiccated coconut (DC) on super-intensive shrimp sludge (SS) anaerobic digestion. A series batch digestion experiments was conducted at an organic loading rate 50 g-VS L-1 a C/N ratio 25 under mesophilic conditions. The results indicate that co-digested substrates are more suitable than single except for DC supplementation, which exhibited...

The present study aimed to assess the physicochemical characteristics of surface water in full-dyke (FD) and semi-dyke (SD) systems An Giang province.Water samples were collected both seasons 2019 (1) first monitoring phase dry season (April) (2) second rainy (October).At each season, at 15 sites FD system SD analyze quality parameters.The results showed that concentrations DO, COD, BOD, TSS, NO 3 -, NH 4 + , TKN, PO 3-and TP parameters higher than there was a significant difference...

Knowledge of diet composition and feeding habits are essential to our understanding fish ecological adaptation aquaculture studies. This study aims gain knowledge on composition, intensity for Glossogobius giuris – a commercial goby residing in brackish freshwater regions the Vietnamese Mekong Delta. A collection 1,291 samples (632 males 659 females) were caught monthly from January 2020 December at four sites using trawl nets. combined analysis prey occurrence weight was used calculate this...

Different rice farming systems affect the soil microbial communities. Here, we report results of 16S rRNA gene amplicon sequencing soils collected from intensive cultivation and rice-shrimp in Soc Trang, Vietnam. The dominant phyla these were Firmicutes, Actinobacteriota, Chloroflexi, Myxococcota, Acidobacteriota.

Chlorpyrifos ethyl is a popular insecticide widely used in agriculture within the Vietnamese Mekong delta, including for rice farming. Here, local farmers often apply pesticides at very high rates which leads to contamination of surrounding environment. Silver barb (Barbonymus gonionotus) fish species indigenous resides variety water bodies and also commonly cultivated rice–fish systems. As result, this risk exposure chlorpyrifos ethyl. This study aims determine lethal concentration (LC50)...

: Biochar is a promising material in mitigating greenhouse gases (GHGs) emissions from paddy fields due to its remarkable structural properties. Rice husk biochar (RhB) and melaleuca (MB) are amendment materials that could be used potentially reduce the Vietnamese Mekong Delta (VMD). However, their effects on CH

Biological settling ponds are a practicable approach for treating super-intensive shrimp aquaculture wastewater almost all producers in the Vietnamese Mekong Delta (VMD). The optimization of hydraulic retention time (HRT) biological plays crucial role establishing stability outflow quality and suitability pond area (SPA). This study aims to suggest appropriate HRT SPA treatment systems based on National Standard (QCVN 02-19:2014/BNNPTNT) best practices (BAP) standards guidelines. We...