scholarly journals Pengaruh Berbagai Macam Nilai EC (elektrical Condoktivity) Terhadap Pertumbuhan Tomat Ceri ( Lycopersicum Esculentum) Dengan Aplikasi Hidroponik Fertigasi Sistem DFT ( Deep Flow Technique)

2020 ◽  
Vol 4 (4) ◽  
pp. 392-401
Author(s):  
Zulbahri Zulbahri ◽  
Darwin Darwin ◽  
Devianti Devianti
Keyword(s):  
Nutrient Solution ◽  
Agricultural Sector ◽  
Irrigation System ◽  
Lycopersicum Esculentum ◽  
Cherry Tomato ◽  
Hydroponic System ◽  
System A ◽  
The Stability ◽  
Tank Water ◽  
Cherry Tomatoes

Abstrak. Peningkatan jumlah penduduk yang sangat pesat mengakibatkan berkurangnya lahan-lahan  pertanian yang sehat, akibat penggunaan yang intensif tanpa diikuti dengan sistem pemupukan yang berimbang. Hal itu mengakibatkan produksi dari sektor pertanian menurun juga berpengaruh pada kondisi ekonomi para petani. Teknologi-teknologi yang dikembangkan manusia untuk mengatasi hal tersebut adalah seperti budidaya tanaman dengan sistem  hidroponik, sistem fertigasi, sistem irigasi tetes dan lainnya. Untuk menjaga stabilitas pertumbuhan tanaman tomat ceri secara hidroponik, suplai hara merupakan suatu keharusan. Unsur hara tersebut diberikan dalam  bentuk  larutan  nutrisi. Alat yang akan digunakan dalam penelitian ini adalah baki persemaian,  tangki penampung larutan nutrisi, pompa air, TDS/EC meter, pH meter, thermometer, timbangan analitik, jangka sorong, gelas ukur, tali penyangga tanaman, alat pengukur tinggi tanaman, pipa penyalur distribusi nutrisi, pipa lateral, dan alat pendukung lainnya. Bahan yang akan digunakan dalam penelitian ini adalah benih tomat ceri, dan larutan nutrisi, rumus yang digunakan untuk menghitung nilai ET0 adalah persamaan Penman mouteid. Berdasarkan hasil penelitian yang telah dilakukan dapat diambil kesimpulan sebagai berikut : Nilai EC yang baik untuk pertumbuhan tomat ceri adalah 1,3 mS/cm dibandingkan dengan perlakuan-perlakuan yang lain. Nilai evapotraspirasi Acuan (ETp)  rata-rata selama penelitian adalah 3,98 mm/hariEffect of Various EC Values on the Growth of Cherry Tomatoes (Lycopersicum esculentum) with Application of Hydroponic Fermentation DFT system (Deep Flow TechniqueAbstract. A very rapid increase in population resulted in a decrease in healthy agricultural lands, due to intensive use without being followed by a balanced fertilization system. This resulted in decreased production from the agricultural sector which also affected the economic conditions of the farmers. Technologies developed by humans to overcome this are as cultivation of plants with a hydroponic system, a fertigation system, a drip irrigation system, and others. To maintain the stability of hydroponic cherry tomato plant growth, nutrient supply is a must. These nutrients are given in the form of nutrient solution. The tools that will be used in this study are the nursery tray, nutrient solution storage tank, water pump, TDS / EC meter, pH meter, thermometer, analytical balance, slide calipers, measuring cups, plant support straps, plant height gauges, distribution pipelines nutrition, lateral pipes, and other supporting tools. The material to be used in this research is cherry tomato seeds, and nutrient solution, the formula used to calculate the ET0 value is the Penman mouthed equation. Based on the results of the research that has been conducted can be concluded as follows: A good EC value for the growth of cherry tomatoes is 1.3 mS/cm compared to other treatments. The mean reference evapotranspiration (ETp) value during the study was 3.98 mm / day.

scholarly journals EFFECT OF NUTRIENT SOLUTION ON GROWTH AND YIELD OF CHERRY TOMATO VARIETIES IN SOILLESS CULTURE

2021 ◽  
Vol 9 (10) ◽  
pp. 235-251
Author(s):  
Shahajahan Ali ◽  
Jahedur Rahman ◽  
Nazrul Islam ◽  
Razzab Ali ◽  
Mofazzal Hossain ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
Fruit Weight ◽  
Growth And Yield ◽  
Cherry Tomato ◽  
Cluster Number ◽  
Hydroponic System ◽  
Full Strength ◽  
Number Of Leaves ◽  
Average Cluster ◽  
Average Individual

Nutrient solution and its nutritional compositions may have the effect on growth and fruit quality attributes of cherry tomato. To avoid the build-up of toxins, mineral deficiencies, nutrition abnormalities, or the spread of disease, producers should use optimum level of nutrient solution. Therefore, the present experiment was conducted to identify a suitable strength of nutrient solution for cherry tomato in hydroponic system. Treatment considered six levels of nutrient solution [viz., S1: ½ strength Rahman and Inden (2012), S2: ¾ strength Rahman and Inden (2012), S3: Full strength Rahman and Inden (2012), S4: ½ strength Hoagland and Arnon No. 2(1940), S5: ¾ strength Hoagland and Arnon No. 2 (1940) and S6: Full strength Hoagland and Arnon No. 2 (1940)] and two varieties [viz., V1: Local market cherry tomato (red), V2: Irelands cherry tomato (yellow)]. Growth and yield contributing characters, quality parameters, physiological traits and biochemical composition were analyzed.  The maximum plant height, number of leaves per plant, first flowering, number of flowers per cluster, number of fruit per cluster, number of cluster per plant, average individual fruit weight and average cluster weight per plant were found in S3. Meanwhile, V2 performed better in respect of plant height, number of leaves per plant, first flowering, number of flowers per cluster, number of fruit per cluster, number of cluster per plant, average individual fruit weight and average cluster weight per plant. Therefore, cherry tomato cv. V2 can be cultured in hydroponic system with applying S3 (Full strength Rahman and Inden nutrient solution).

scholarly journals Physiology and production of cherry tomato cultivars in a hydroponic system using brackish water

2021 ◽  
Vol 25 (4) ◽  
pp. 219-227
Author(s):  
Mateus C. Batista ◽  
Ronaldo do Nascimento ◽  
Sebastião de O. Maia Júnior ◽  
Elka C. S. Nascimento ◽  
Carlos V. de C. Bezerra ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Nutrient Solution ◽  
Brackish Water ◽  
Arid Regions ◽  
Cherry Tomato ◽  
Tomato Plants ◽  
Hydroponic System ◽  
Photosynthetic System ◽  
Salinity Levels ◽  
Tomato Cultivars

ABSTRACT Agricultural production has become a challenge in arid and semi-arid regions due to the scarcity of water for irrigation, so brackish water is commonly used. The present study aimed to evaluate the physiological and production responses of cherry tomato cultivars under salinity levels of the nutrient solution in a hydroponic system. The experiment was conducted in a split plot and 5 × 3 factorial scheme with four repetitions. The factors corresponded to different values of electrical conductivity of the nutrient solution (ECns 2.5, 4.0, 5.5, 7.0 and 8.5 dS m-1) and cultivars (Samambaia, Tomate Vermelho and Caroline). The increase in nutrient solution salinity negatively affected the gas exchange, electrolyte leakage and photosynthetic pigments of the cherry tomato cultivars, mainly with the prolongation of stress. The photosynthetic system was efficient up to 4.0 dS m-1, but, above this electrical conductivity in the nutrient solution, there was photoinhibition or photodamage in the cherry tomato plants at 30 days after transplanting. The cherry tomato cultivars Samambaia and Caroline were the most adapted to brackish solutions, while Tomate Vermelho was the most susceptible.

scholarly journals 456 An Automatic, Controlled Water-Table Irrigation System for Vegetable Transplant Production

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 523C-523
Author(s):  
J.W. Buxton ◽  
Wenwei Jia
Keyword(s):  
Water Table ◽  
Nutrient Solution ◽  
Irrigation System ◽  
Growing Media ◽  
System A ◽  
Fixed Distance ◽  
Run Off ◽  
Vegetable Seed ◽  
Growth Of Seedlings ◽  
Water Ratio

The controlled water-table irrigation (CWT) system was evaluated for vegetable seed germination and transplant growth. The system is a modification of capillary mat irrigation except that the mat along one side extends over the edge of the bench into a narrow trough running along the side of the bench. The nutrient solution level in the trough is controlled by a liquid level controller, so it is at a fixed distance below the bench surface. The nutrient solution is drawn by capillarity from the trough upward to the bench surface and then moves by capillarity to the opposite side of the bench. The system automatically maintains a constant air: water ratio in the growing media. Seeds of broccoli, tomato, and pepper were germinated in a 96-cell plug tray and grown to transplanting stage with the CWT system. A factorial experiment consisted of two growing media combined with CWT treatments of 2 and 4 cm. Excellent germination and high-quality seedlings were produced with all treatments. No differences were observed in growth of seedlings at 2 vs. 4 cm or between the two growing media. The CWT system is capable of maintaining a constant uniform water: air ratio in all plug cells on a commercial growing bench. Nutrient solution does not run off the bench. The CWT potentially is an excellent system for the irrigation of vegetable transplants.

scholarly journals Sindy cherry tomato: A low potassium (K) demanding, high-quality and highly productive cultivar

2019 ◽  
pp. 785-791
Author(s):  
Hermínia Emília Prieto Martinez ◽  
Janini Tatiane Lima Souza Maia ◽  
Carla do Carmo Milagres ◽  
Junia Maria Clemente ◽  
Paulo Roberto Cecon
Keyword(s):  
Nutrient Solution ◽  
Irrigation System ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Cherry Tomato ◽  
Randomized Design ◽  
K Deficiency ◽  
Calcium Magnesium ◽  
Β Carotene

Potassium (K) is one of the most abundant nutrient and has the greatest influence on fruit quality as it regulates the synthesis and translocation of photoassimilates in plants. K deficiency in tomato plants can compromise the quality and flavor of fruits. Thus, the objective of this work was to evaluate the effect of K doses on the production and quality of cherry tomato fruits in a hydroponic system. We cultivated the cherry tomato Hybrid Sindy for 120 days, from June to October, in an expanded clay sub irrigation system. The experiment was arranged in a completely randomized design with four replicates. The treatments consisted of increasing concentrations of K (6, 8, 10 and 12 mmol L-1) in the nutrient solution provided during the fructification period. It was evaluated production, mean weight of fruits and bunch, total soluble solids contents, titratable acidity, pH, and contents of lycopene, β-carotene, and a chlorophyll. The contents of nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, copper, boron, iron, zinc, and manganese were also determined in the fruits and in the third leaf above the fourth fruit bunch. Six mmol L-1 of K in the nutrient solution was enough to ensure the production and quality of the Sindy hybrid cherry tomato. Nevertheless, higher K doses improved the contents of the bioactive compounds lycopene and β -carotene in the fruits.

scholarly journals Yield and quality of cherry tomato fruits in hydroponic cultivation

2019 ◽  
Vol 35 (5) ◽  
Author(s):  
Nildo da Silva Dias ◽  
Adriana Araújo Diniz ◽  
Patrícia Ligia Dantas de Morais ◽  
Gledyson Dos Santos Pereira ◽  
Francisco Vanies da Silva Sá ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
Block Design ◽  
Tomato Fruits ◽  
Hydroponic System ◽  
Post Harvest ◽  
Yield And Quality ◽  
Hydroponic Cultivation ◽  
Electrical Conductivities ◽  
Cherry Tomatoes

Because of the food and industrial importance of tomato, it holds great significance, and is one of the most produced species using the hydroponic cultivation systems. The objective of this study was to evaluate the effects of different concentrations of nutrient solution on the production and quality of cherry tomatoes (Lycopersicon esculentum ‘Samambaia’) grown in a hydroponic system in protected conditions. The experiment was conducted in pots filled with coconut fiber substrate using a randomized complete block design with four replications and six plants per plot. Five concentrations of nutrients were evaluated (50, 75, 100, 125, and 150% of the standard nutrient solution); the solutions produced the following electrical conductivities: 1.8, 2.0, 2.6, 3.4, and 3.9 dS m-1, respectively. At 90 days after transplanting, the tomato fruits were harvested, at which time the production variables and post-harvest quality of mature fruits were determined. The best production and post-harvest quality indexes of cherry tomatoes (‘Samambaia’) were found when using 111% of the standard nutrient solution, corresponding to the concentrations of 9.44, 2.44, 2.22, 6.44, 4.11, 2.44, and 2.78 mmolc L-1, of NO3-, NH4+, P, K, Ca, Mg, and S, respectively; and 66.6, 55.5, 14.4, 1.89, 0.56, and 0.44 mmolc L-1, of Fe, B, Mn, Zn, Cu, and Mo, respectively. Nutrient solutions with electrical conductivity above 2.89 dS m-1 severely reduced the fruit yield of cherry tomatoes.

NPLs — The Solution Recipe for Albania

2015 ◽  
Vol 3 (1) ◽  
pp. 48
Author(s):  
Elona Shehu ◽  
Elona Meka
Keyword(s):  
Interest Rate ◽  
Negative Relationship ◽  
Banking System ◽  
Gdp Growth ◽  
System A ◽  
Analysis Technique ◽  
Recent Financial Crisis ◽  
The Stability ◽  
Asset Quality ◽  
Macroeconomic Determinants

The quality of the loan portfolio in Albanian banking system is facing many obstacles during the last decade. In this paper we look at possible determinants of assets quality. During the recent financial crisis commercial banks were confronted with deteriorating asset quality that threatened not only the banking industry, but also the stability of the entire financial system. This study aims to examine the correlation between non-performing loans and the macroeconomic determinants in Albania during the last decade. NPLs are considered to be of a high importance as they represent the high risk exposure of banking system. A solid bank with healthy assets increases the market efficiency. Our approach is based on a panel data regression analysis technique from 2005-2015. Within this methodology this study finds robust evidence on the existing relationship between lending interest rate, real GDP growth and NPLs. We expect to find a negative relationship between lending interest rate and asset quality. Further we assume an inverse relationship between GDP growth and non-performing loans, suggesting that NPLs decrease if the economy is growing. Furthermore this study proposes a solution platform, which looks deeper into the possibility of creating a secondary active market for troubled loans, restructuring the banking system or implementing the Podgorica model. This research paper opens a new lieu of discussion in terms of academic debates and decision-making policies.

Irrigation of Geraniums with an Automatic Controlled Water Table System

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 522d-522 ◽  
Author(s):  
J.W. Buxton ◽  
D.L. Ingram ◽  
Wenwei Jia
Keyword(s):  
Water Potential ◽  
Leaf Area ◽  
Water Table ◽  
Nutrient Solution ◽  
Irrigation System ◽  
Central Area ◽  
Dry Weight ◽  
Trickle Irrigation ◽  
Run Off ◽  
Optimum Water

Geraniums in 15-cm pots were irrigated automatically for 8 weeks with a Controlled Water Table (CWT) irrigation system. Plants were irrigated with a nutrient solution supplied by a capillary mat with one end of the mat suspended in a trough below the bottom of the pot. The nutrient solution remained at a constant level in the trough. Nutrient solution removed from the trough was immediately replaced from a larger reservoir. The vertical distance from the surface of the nutrient solution and the bottom of the pot determined the water/air ratio and water potential in the growing media. Treatments consisted of placing pots at 0, 2, 4, and 6 cm above the nutrient solution. Control plants were irrigated as needed with a trickle irrigation system. Geraniums grown at 0,2 and 4 CWT were ≈25% larger than the control plants and those grown at 6 CWT as measured by dry weight and leaf area. Roots of plants grown at 0 CWT were concentrated in the central area of the root ball; whereas roots of plants in other treatments were located more near the bottom of the pot. Advantages of the CWT system include: Plant controlled automatic irrigation; no run off; optimum water/air ratio.

Towards a new design with generic modeling and adaptive control of a transformable quadrotor

2021 ◽  
pp. 1-31
Author(s):  
S.H. Derrouaoui ◽  
Y. Bouzid ◽  
M. Guiatni
Keyword(s):  
Adaptive Control ◽  
Control Strategy ◽  
Experimental Tests ◽  
Generic Model ◽  
System Control ◽  
System A ◽  
Viable Solution ◽  
Generic Modeling ◽  
Adaptive Control Strategy ◽  
The Stability

Abstract Recently, transformable Unmanned Aerial Vehicles (UAVs) have become a subject of great interest in the field of flying systems, due to their maneuverability, agility and morphological capacities. They can be used for specific missions and in more congested spaces. Moreover, this novel class of UAVs is considered as a viable solution for providing flying robots with specific and versatile functionalities. In this paper, we propose (i) a new design of a transformable quadrotor with (ii) generic modeling and (iii) adaptive control strategy. The proposed UAV is able to change its flight configuration by rotating its four arms independently around a central body, thanks to its adaptive geometry. To simplify and lighten the prototype, a simple mechanism with a light mechanical structure is proposed. Since the Center of Gravity (CoG) of the UAV moves according to the desired morphology of the system, a variation of the inertia and the allocation matrix occurs instantly. These dynamics parameters play an important role in the system control and its stability, representing a key difference compared with the classic quadrotor. Thus, a new generic model is developed, taking into account all these variations together with aerodynamic effects. To validate this model and ensure the stability of the designed UAV, an adaptive backstepping control strategy based on the change in the flight configuration is applied. MATLAB simulations are provided to evaluate and illustrate the performance and efficiency of the proposed controller. Finally, some experimental tests are presented.

scholarly journals MINERAL NUTRITION OF CRISPHEAD LETTUCE GROWN IN A HYDROPONIC SYSTEM WITH BRACKISH WATER

2016 ◽  
Vol 29 (3) ◽  
pp. 656-664 ◽  
Author(s):  
HAMMADY RAMALHO E SOARES ◽  
ÊNIO FARIAS DE FRANÇA E SILVA ◽  
GERÔNIMO FERREIRA DA SILVA ◽  
RAQUELE MENDES DE LIRA ◽  
RAPHAELA REVORÊDO BEZERRA
Keyword(s):  
Nutrient Solution ◽  
Mineral Nutrition ◽  
Brackish Water ◽  
Water Source ◽  
Water Salinity ◽  
Hydroponic System ◽  
Foliar Phosphorus ◽  
Solution Preparation ◽  
Phosphorus And Potassium ◽  
Local Water

ABSTRACT Water availability in the Brazilian semiarid is restricted and often the only water source available has high salt concentrations. Hydroponics allows using these waters for production of various crops, including vegetables, however, the water salinity can cause nutritional disorders. Thus, two experiments were conducted in a greenhouse at the Department of Agricultural Engineering of the Federal Rural University of Pernambuco, to evaluate the effects of salinity on the mineral nutrition of crisphead lettuce, cultivar Taina, in a hydroponic system (Nutrient Film Technique), using brackish water in the nutrient solution, which was prepared by adding NaCl to the local water (0.2 dS m-1). A randomized blocks experimental design was used in both experiments. The treatments consisted of water of different salinity levels (0.2, 1.2, 2.2, 3.2, 4.2 and 5.2 dS m-1) with four replications, totaling 24 plots for each experiment. The water added to compensate for the water - depth loss due to evapotranspiration (WCET) was the brackish water of each treatment in Experiment I and the local water without modifications in Experiment II. The increase in the salinity of the water used for the nutrient solution preparation reduced the foliar phosphorus and potassium contents and increased the chloride and sodium contents, regardless of the WCET. Foliar nitrogen, calcium, magnesium and sulfur contents were not affected by increasing the water salinity used for the nutrient solution preparation.

scholarly journals Leaf compatible “eco-friendly” temperature sensor clip for high density monitoring wireless networks

2017 ◽  
Vol 4 (1) ◽  
pp. 55-60 ◽  
Author(s):  
Valeria Palazzari ◽  
Paolo Mezzanotte ◽  
Federico Alimenti ◽  
Francesco Fratini ◽  
Giulia Orecchini ◽  
...  
Keyword(s):  
Decision Support ◽  
Water Stress ◽  
Temperature Sensor ◽  
Irrigation System ◽  
Fuel Oil ◽  
Plant Water ◽  
Temperature Differential ◽  
Water Pump ◽  
Plant Water Stress ◽  
System A

This paper describes the design, realization, and application of a custom temperature sensor devoted to the monitoring of the temperature differential between the leaf and the air. This difference is strictly related to the plant water stress and can be used as an input information for an intelligent and flexible irrigation system. A wireless temperature sensor network can be thought as a decision support system used to start irrigation when effectively needed by the cultivation, thus saving water, pump fuel oil, and preventing plant illness caused by over-watering.

Sign in / Sign up

Export Citation Format

Share Document