scholarly journals Production, water consumption and nutrient content of Chinese cabbage grown hydroponically in brackish water

2015 ◽  
Vol 46 (3) ◽  
Author(s):  
Raquele Mendes de Lira ◽  
Ênio Farias de França e Silva ◽  
Gerônimo Ferreira da Silva ◽  
Alexandre Nascimento dos Santos ◽  
Mário Monteiro Rolim
2018 ◽  
Vol 36 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Raquele M Lira ◽  
Ênio FF Silva ◽  
Gerônimo F Silva ◽  
Hammady R Soares ◽  
Lilia G Willadino

ABSTRACT The underground water reserves in the semi-arid region present high salinity levels. However, the scarcity of the resource compels the use of this water for several human activities, including agriculture. The aim of this work was to evaluate the use of brackish water for watercress cultivation (Nasturtium officinale) in a hydroponic NFT system (laminar flow of nutrients) and effects on water consumption, growth, yield and nutrient extraction by the plant. We studied six levels of salinity (0.2; 1.2; 2.2; 3.2; 4.2 and 5.2 dS m-1), in a completely randomized experimental design, with four replicates. Salinity was obtained by the addition of NaCl into the local water supply, being these waters used to prepare the nutrient solution and to replace the evapotranspirated water volume. We noticed a reduction in leaf area, fresh and dry mass of shoot, K content in plant and water consumption of the crop and, increased contents of P, Na, Cl in the plants, with increasing salinity of the solution. The use of brackish water for watercress cultivation in hydroponics is possible as an alternative for producers who have availability of brackish water and restricted possibility of fresh water. A reduction in dry mass of plants was observed with increasing electrical conductivity.


2018 ◽  
Vol 36 (2) ◽  
pp. 205-210
Author(s):  
Raquele M Lira ◽  
Ênio FF Silva ◽  
Lilia Willadino ◽  
Ronaldo A Oliveira Filho ◽  
Gilvany R Andrade

ABSTRACT Underground water reserves in Semiarid Region present high salinity levels; however, scarcity of resource compels farmers to use this water for conventional agriculture. Biomass production and activity of the antioxidative defense system of Chinese cabbage and watercress were evaluated in plants grown under hydroponic NFT system with brackish water. The experimental design was completely randomized, with four replications and five water salinity levels (1.95; 3.37; 4.48; 6.82 and 7.51 dS m-1), obtained by an increasing addition of NaCl into the local water supply and nutrient salts for preparation of nutrient solution. Both watercress and Chinese cabbage plants decreased in fresh and dry shoot biomass, in relation to increase of salinity in solution, considering that these losses were marked in Chinese cabbage crop. The antioxidative defense system was activated in both evaluated species. Superoxide dismutase (SOD) and peroxidase (POD) increased their activity in relation to salinity increase in the solution. Watercress presented higher POD activity and was able to maintain catalase (CAT) and total phenols higher than control in most treatments, resulting in better adaptation to salt stress.


Author(s):  
Adiel F. da S. Cruz ◽  
Gerônimo F. da Silva ◽  
Ênio F. de F. e Silva ◽  
Hammady R. e Soares ◽  
Jenyffer da S. G. Santos ◽  
...  

ABSTRACT The tolerance of crops to salinity is greater in hydroponic systems due to the low contribution of the matric potential to the total potential of the water. The objective of this study was to evaluate the use of brackish water, to prepare the nutrient solution and replace the evapotranspired volume, and rates of application of this solution on the water stress index, water potential, leaf succulence and water consumption of cauliflower cv. ‘Piracicaba Precoce’. The experimental design was completely randomized in a 6 x 2 factorial scheme, with six salinity levels used to prepare the nutrient solutions (0.2, 1.5, 2.5, 3.5, 4.5 and 5.5 dS m-1) and two application rates of these solutions (1.5 and 2.5 L min-1), with four replicates. Water stress index (WSI), water and osmotic leaf potentials, leaf succulence (LS) and water consumption were analyzed. The increase in water salinity reduced LS and increased WSI. Water salinity reduced the water and osmotic leaf potentials and water consumption of the crop; however, the effects were more pronounced at the rate of 2.5 L min-1. Application rate of 2.5 L min-1 led to the highest WSI and lowest LS.


2020 ◽  
Vol 1 (2) ◽  
pp. 1-5
Author(s):  
Sanjide Aktur ◽  
Nilafu Yeumine

One of the commodities that help improve the economy of farmers in the country, especially in East China, namely the commodity shrimp. Shrimp is a source of high-quality animal protein. And for the state, shrimp is the prima donna of non-oil and gas exports. Shrimp is a type of brackish water consumption fish. The 13-segmented bodies are 5 head and 8 thoracic segments and the entire body is covered by an outer frame called an exoskeleton. Generally, Vannamei shrimp is available in the market, consisting mostly of sea shrimp. Only a small part consists of freshwater shrimp, especially in areas around large rivers and swamps near the coast. Freshwater shrimp are generally included in the Palaemonidae family so that experts call them the palaemonid shrimp group


Desalination ◽  
2011 ◽  
Vol 281 ◽  
pp. 271-277 ◽  
Author(s):  
Joilma da S. Menezes ◽  
Vânia P. Campos ◽  
Tadeu A. de C. Costa

Euphytica ◽  
1988 ◽  
Vol 39 (1) ◽  
pp. 65-73 ◽  
Author(s):  
C. G. Kuo ◽  
B. J. Shen ◽  
H. M. Chen ◽  
H. C. Chen ◽  
R. T. Ope�a

Author(s):  
Miguel Á. Solís-Tejeda ◽  
Fabiola Lango-Reynoso ◽  
María del R. Castañeda-Chávez ◽  
Laura C. Ruelas-Monjardin

Objective: To identify and estimate waste production, water consumption and production practices of backyard swine farms at the municipality of Tepetlán; Veracruz, Mexico, to foresee the possible influences on the environment and generate information that promotes new public environmental policies adapted to small producers.Methodology: 36 backyard livestock production units were identified and studied in Vicente Guerrero and Alto Tío Diego by a census in which structured surveys were applied to obtain data; the results were analyzed by descriptive statistics. The maximum pollutant potential of the load with the installed infrastructure was estimated.Results: We registered 503 swine heads of diverse zootechnical functions, mainly from the Landrace breed, in 36 studied farms, 54.7% of idle infrastructure was identified. We found that about three tons of excreta are produced per day between the towns of Vicente Guerrero and Alto Tío Diego, from which 78% are dumped into the municipal drainage. The average water consumption per unit of livestock production was 132.2 Land for each unit of animal population 28.5 L, with a standard deviation of 32.2 L per animal population unit. This research also provides information on the feeding and production practices of the animals. It was possible to estimate the volume of swine excreta generated in the assessed localities. However, it is necessary to quantify organic matter, nitrogenous products, phosphorus, and total and fecal coliforms.Conclusions: It is important to quantify and regulate the generated waste by this livestock activity, to take corrective and regulatory decisions, to establish solutions that protect natural resources without harming the economy of the small producer.


Author(s):  
Leo Tan Wee Hin ◽  
R. Subramaniam

The use of policy instruments in the environmental framework to promote sustainable energy practices in Singapore, a country in the South East Asian region, is explored in this chapter. Four areas are specifically identified for coverage: waste production, water consumption, transportation and atmospheric emission, owing to their highly entrenched nexus with the environment. The presence of these policy instruments has been a major factor why sustainable energy practices are well ensconced in Singapore and the rate of increase of the carbon footprint on the environment has been lessened significantly. It is suggested that there are useful lessons to be drawn from the Singapore experience for other countries. Several recommendations are provided in this context.


2020 ◽  
Vol 5 ◽  
pp. 5-6
Author(s):  
Boboeva Gulmira Sadikovna ◽  
Keldiyarova Gulmira Farhadovna

This article provides normative calculations of water consumption and water supply for slate production, water consumption for technical processes and for household and drinking needs. As well as, wasted water analysis, monitoring and efficiency of the treatment plant.


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