scholarly journals Hydroponic Lettuce Cultivation Using Organic Nutrient Solution from Aerobic Digested Aquacultural Sludge

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1484
Author(s):  
Maha Ezziddine ◽  
Helge Liltved ◽  
Randi Seljåsen
Keyword(s):  
Nutrient Solution ◽  
Leaf Tissue ◽  
Mineral Fertilizer ◽  
Fresh Weight ◽  
Hydroponic System ◽  
Organic Nutrient ◽  
Marked Weight ◽  
Rich Solution ◽  
Lettuce Growth ◽  
Nutrient Solutions

The aim of this study was to demonstrate how aquacultural sludge can be processed and utilized as an organic nutrient solution (ONS) for hydroponic lettuce production. By using a previous developed method, approximately 80% of the processed sludge was reclaimed as a clear, nutrient-rich solution. The performance of the recovered nutrient solution on lettuce growth was assessed in a nutrient film hydroponic system. The results were compared to the results obtained using a conventional nutrient solution (CNS). Yield, fresh weight, water consumption, and nutrient and heavy metal content in leaf tissue were measured. In spite of a 16% lower average fresh weight obtained in ONS compared to the weight obtained in CNS, there was no statistical difference of the yield of lettuce among the two nutrient solutions. After the cultivation period, 90% of the lettuce heads grown in ONS exceeded the marked weight of 150 g. Foliar analysis revealed a similar or higher content of all nutrients, except of magnesium and molybdenum in the leaves of lettuce grown in the ONS compared to lettuce grown in the CNS. This study shows that nutrients recovered from aquacultural sludge can be utilized as fertilizer, thereby reducing the dependency on mineral fertilizer in hydroponic and aquaponic systems.

scholarly journals Quality and Yield of Lettuce in an Open-Air Rooftop Hydroponic System

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2586
Author(s):  
Maha Ezziddine ◽  
Helge Liltved
Keyword(s):  
Leaf Tissue ◽  
Growth Period ◽  
Weather Conditions ◽  
Nutrient Content ◽  
Foliar Analysis ◽  
Fresh Weight ◽  
Hydroponic System ◽  
Nutrient Film Technique ◽  
Lettuce Growth ◽  
Strong Winds

In this study, the yield and growth performance of lettuce in an open-air rooftop hydroponic system were investigated. Lettuce was grown in a closed recirculating nutrient film technique (NFT) unit using a standard nutrient solution (NS). Yield, fresh weight, and nutrient content in the leaf tissue of the harvested lettuce were measured. The results were compared with the results obtained in indoor hydroponic lettuce growth with artificial lightning. Despite strong winds during the growth period, 25% of the total lettuce heads weighed twice the marketable weight; however, 25% of the total lettuce heads were below the marketable weight. A more efficient nutrient uptake was indicated by the lettuces in the rooftop system compared with the uptake in the indoor system. Foliar analysis revealed a higher content of all nutrients in the leaves of rooftop hydroponic lettuce compared with indoor hydroponic lettuce. This study suggests that hydroponic rooftop-grown lettuce can be competitive with their indoor counterparts if the rooftop hydroponic system is protected from extreme weather conditions.

scholarly journals Influence of the N/K ratio on the production and quality of cucumber in hydroponic system

Revista CERES ◽  
2011 ◽  
Vol 58 (5) ◽  
pp. 619-624 ◽  
Author(s):  
Adriene Woods Pedrosa ◽  
Herminia Emilia Prieto Martinez ◽  
Edson Marcio Matiello ◽  
Paulo Cezar Rezende Fontes ◽  
Paulo Roberto Gomes Pereira
Keyword(s):  
Nutrient Solution ◽  
Vegetative Growth ◽  
Additional Treatment ◽  
Fresh Weight ◽  
Hydroponic System ◽  
Randomized Design ◽  
Hydroponic Cultivation ◽  
Fruit Setting ◽  
Nutrient Solutions

The objective of this work was to evaluate the quality of fruits and the nutritional status of cucumber CV. Aodai cultivated in nutrient solutions with different N:K ratios. The hydroponic cultivation was initially performed, during the vegetative growth, in nutrient solution with 1:2.0 mmol L-1 N:K, and, later, during fruit setting, in four different nutrient solutions with N:K (w/w) at the ratios 1:1.4, 1:1.7, 1:2.0 and 1:2.5. An additional treatment with a nutrient solution containing the ratio 1:2.2 (w/w) N:K during the vegetative growth and N:K 1:1.4 (w/w) during fruit setting, both with 10% ammonium (NH4+) was included. The treatments were arranged in a randomized design with six replicates. Irrigation was carried out with deionized water until seed germination, and then with nutrient solution until 30 days after germination, when plants were transplanted. Plants in the hydroponic growing beds were irrigated with the solutions for vegetative growth, and, after 21 days, the solutions were replaced by solutions for fruit setting. At 45 and 60 days after transplanting, the fresh weight, length, diameter, volume and firmness of the fruit were evaluated, and, at 45 days after transplanting, the macronutrient concentrations in the leaves were determined. The use of different N:K ratios during fruit setting influenced the cucumber production. The ratio of 1.0:1.7 N: K (w/w), with 10% of N in the form of ammonia, is recommended for the whole cycle.

Organic nutrient solution for hydroponic system

2021 ◽  
Author(s):  
Lakma Upendri ◽  
Brintha Karunarathna
Keyword(s):  
Nutrient Solution ◽  
Hydroponic System ◽  
Organic Nutrient

scholarly journals Hydroponic lettuce production in different concentrations and flow rates of nutrient solution

2012 ◽  
Vol 30 (3) ◽  
pp. 526-530 ◽  
Author(s):  
Gláucio da C Genuncio ◽  
Marcelle Gomes ◽  
Anderson Claiton Ferrari ◽  
Nidia Majerowicz ◽  
Everaldo Zonta
Keyword(s):  
Nutrient Solution ◽  
Flow Rate ◽  
Aerial Part ◽  
Ionic Concentration ◽  
General Analysis ◽  
Ion Concentration ◽  
Fresh Weight ◽  
Flow Rates ◽  
Hydroponic System ◽  
Ionic Concentrations

The objective of this study was to evaluate the accumulation of fresh weight of hydroponic lettuce in terms of ionic concentrations and flow rates of nutrient solution. This work consisted of three experiments in NFT hydroponic system, conducted between July and September 2006. Lettuce cultivars Lucy Brown, Izabela and Veneza were grown in different ionic concentrations of the 100, 75 and 50% and flow rates of 1.50, 1.00 and 0.75 L min-1. Fresh weight gains were observed for Lucy Brown when grown on 100% of the ion concentration and a flow rate of nutrient solution of 1.0 L min-1. Greater fresh mass was observed for cvs. Izabela and Veneza under the flow rate of 1.5 L min-1. A general analysis of the data allows us to conclude that the application of nutrient solution at a flow rate of 1.5 L min-1, as well as 100% of the ionic concentration is effective to increase the fresh weight of the aerial part of cvs. Lucy Brown, Izabela and Veneza when grown in hydroponics.

scholarly journals EFFECT OF CONCENTRATION AND N:K RATIO IN NUTRIENT SOLUTION FOR HYDROPONIC PRODUCTION OF CUCUMBER

2017 ◽  
Vol 30 (4) ◽  
pp. 818-824 ◽  
Author(s):  
DEISE SILVA CASTRO PIMENTEL CARDOSO ◽  
MARIA APARECIDA NOGUEIRA SEDIYAMA ◽  
YONARA POLTRONIERI ◽  
MAIRA CHRISTINA MARQUES FONSECA ◽  
YANE FERNANDES NEVES
Keyword(s):  
Nutrient Solution ◽  
Nitrogen Availability ◽  
Block Design ◽  
Dry Mass ◽  
Hydroponic System ◽  
Aerial Parts ◽  
Lack Of Information ◽  
Randomized Block Design ◽  
Hydroponic Cultivation ◽  
Nutrient Solutions

ABSTRACT The N:K ratio influences the balance between vegetative and reproductive stages, because potassium plays important roles in the processes that regulate plant growth when the nitrogen availability is high. However, there is a lack of information on the N:K ratio suitable for cucumber cultivation in an NFT-hydroponic system. The objective of this study is to evaluate the different N:K ratios in fruiting nutrient solutions for cucumber production in a hydroponic system. Treatments consisted of two cucumber hybrids (Natsuno Kagayaki and Runner) and four nutrition solutions with different N:K ratios (w/w) (1:0.5, 1:1.0, 1:2.0, and 1:3.0) in the reproductive phase arranged as split plots in a randomized block design with four replications. On the 33rd day after sowing (DAS), the SPAD index on the fourth expanded leaf from the plant apex, number of broaches, and harvests were evaluated. The aerial parts of the plants were collected on the 54th DAS for evaluation of fresh mass, dry mass, and number of leaves per plant. The results showed that the highest concentration of K in the fruiting nutrient solution does not alter the length of the fruits but increases their diameter yield. The N:K ratios in the 1:2.0 and 1:3.0 (w/w) nutrient solutions provided greater yields in both evaluated hybrids. The hybrid Natsuno Kagayaki, however, showed the highest productivity, and it is recommended for hydroponic cultivation.

Some Effects of Humidity on the Translocation of 2,4,5-T in Bean Plants

Weed Science ◽  
1970 ◽  
Vol 18 (3) ◽  
pp. 396-398 ◽  
Author(s):  
Eddie Basler ◽  
Fred W. Slife ◽  
John W. Long
Keyword(s):  
Acetic Acid ◽  
Relative Humidity ◽  
Nutrient Solution ◽  
Leaf Tissue ◽  
Phloem Transport ◽  
High Humidity ◽  
Plant Parts ◽  
Bean Plants ◽  
Low Humidity ◽  
Nutrient Solutions

The effect of humidity on the rate and direction of translocation of stem-injected (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T) in bean (Phaseolus vulgaris L., var. Stringless Green-pod) seedlings was determined. A total of 0.75 μg of 14C-labeled 2,4,5-T was injected into the stem with a 1-μl syringe pipette. Translocation was determined by assaying the nutrient solution and plant parts for 14C. High relative humidities enhanced downward translocation to roots and nutrient solutions. About 41% of the applied 2,4,5-T was found in the nutrient solution after 2 days' treatment at about 95% relative humidity while only 23% was found when treatment was conducted at 20% relative humidity. Low humidity during treatment caused much more 2,4,5-T to be translocated upward to the primary leaves and young shoots of the seedlings and this effect was more pronounced in plants which were grown in low humidity prior to treatment. The results confirm the conclusions of others and show that the increased basipetal phloem transport of herbicides in plants under high humidity is not due to an effect on penetration of herbicides in leaf tissue.

scholarly journals Mineral Composition of Lettuce Grown in Hydroponic System With Wastewater

2018 ◽  
Vol 10 (7) ◽  
pp. 317
Author(s):  
Josilda de França Xavier ◽  
Carlos Alberto Vieira de Azevedo ◽  
Marcia Rejane de Q. A. Azevedo ◽  
José Emídio de Albuquerque Junior ◽  
João Paulo de Oliveira Simões
Keyword(s):  
Mineral Composition ◽  
Nutrient Solution ◽  
Domestic Wastewater ◽  
Mineral Fertilizers ◽  
Well Water ◽  
Hydroponic System ◽  
Treated Effluents ◽  
Nutrient Solutions

The use of treated effluents is not a new practice in agriculture, however, the optimization of wastewater was given with mineral fertilizers to grow lettuce in a hydroponic system, subject that is still barely studied. The objective of this study was to evaluate the mineral composition of three lettuce cultivars (Verônica, Vanda and Thais) in a hydroponic system using wastewater, well water and optimized nutrient solutions. The plants was grown in seven nutrient solutions, as S1 = Furlani solution; S2 = domestic wastewater; S3 = optimized domestic wastewater; S4 = well water; S5 = optimized well water; S6 = wastewater UASB and S7 = optimized UASB wastewater and the sub-plot for three lettuce cultivars. It was verified that the treatments S2, S4 and S6 when compared with the respective optimized solutions S3, S5 and S7 presented lower levels of nitrogen, potassium, calcium, zinc, copper and manganese in the two experiments. Same behavior was not observed for phosphorus and sodium. As for the cultivars, they presented, regardless of the experiment, mineral composition similar to each other when the same nutrient solution was used.

scholarly journals Production of Passion fruit in a semi-hydroponic system under protected cultivation

2019 ◽  
Vol 41 (5) ◽  
Author(s):  
Douglas José Marques ◽  
José Andres Carreño Siqueira ◽  
Hudson Carvalho Bianchini ◽  
Vinicius Mendes Alves
Keyword(s):  
Electrical Conductivity ◽  
Gas Exchange ◽  
Nutrient Solution ◽  
Block Design ◽  
Passion Fruit ◽  
Passiflora Edulis ◽  
Hydroponic System ◽  
Nutrient Contents ◽  
Protected Cultivation ◽  
Nutrient Solutions

Abstract The objective of this research was to evaluate the production of passion fruit (Passiflora edulis Sims) cultivars in different nutrient solutions, using commercial Bioplant® substrate in slabs system in protected cultivation. A randomized complete block design in a factorial scheme was used with 2 passion fruit cultivars (Araguari and Yellow Master) x 4 nutrient solutions (solution 1, solution 2, solution 3 and solution 4), each plot consisting of 6 plants with 6 replications. Electrical conductivity evaluations in the slabs drained solution started at 15 days after seedling transplantation and the nutrient contents were quantified at the end of the research. In passion fruit, ether extract, crude fiber and crude protein were evaluated. Fruit number, pulp mass, peel thickness and gas exchange were evaluated. It was concluded that the use of nutrient solution 2 in cultivar Yellow Master, with 2.72 dS m-1 electrical conductivity and the use of nutrient solution 4 in cultivar Araguari, with 2.95 dS m-1 electrical conductivity, yielded the largest number of fruits, pulp mass, fruit mass and gas exchange, in slabs system in the protected cultivation of passion fruit.

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