The Relationship Model of Light Interception and Plant Cultivation Form

2013 ◽  
Vol 655-657 ◽  
pp. 2006-2009
Author(s):  
Heng Hua Shi ◽  
Yu Jie Wang ◽  
Cheng Kui Guo ◽  
Yan Zhang ◽  
Jia Xin Wu
Keyword(s):  
Plant Growth ◽  
Growth Form ◽  
Elevation Angle ◽  
Light Interception ◽  
Simulation Environment ◽  
Plant Cultivation ◽  
Relationship Model ◽  
Plant Photosynthesis ◽  
The Relationship ◽  
Solar Elevation Angle

Plant light interceptions directly impact on plant photosynthesis, and thus have an impact on plant growth. According to the characteristics of plant photosynthesis and growth and development, we abstract plant growth form as the geometry. Based on solar elevation angle, solar azimuth angle and spacing of plant cultivation, we get the relationship model of plant light interception and planting cultivation form under assumptions. In the simulation environment, we set spindle trees as an example and analyze the best cultivation form of plants under the conditions of the specific latitude.

scholarly journals Light-Intercepting Characteristics and Growth of Tomatoes Cultivated in a Greenhouse Using a Movable Bench System

Horticulturae ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 60
Author(s):  
Yuta Ohashi ◽  
Misato Murai ◽  
Yasuhiro Ishigami ◽  
Eiji Goto
Keyword(s):  
Solar Radiation ◽  
Plant Growth ◽  
Growth Stage ◽  
Unit Area ◽  
Early Stage ◽  
Light Interception ◽  
The Other ◽  
Plant Yield ◽  
Plant Cultivation ◽  
Canopy Light Interception

The objective of this study was to investigate the growth and light-intercepting characteristics of tomatoes when movable benches are used in their cultivation. We cultivated tomatoes in a greenhouse (168 m2) during summer (9 July–9 September 2018) under different furrow distances (F1.0 = 1.0 m and F1.6 = 1.6 m) and movable benches (M indicates that the furrow distance = 0.4–0.8 m). Compared to the other treatments, when the movable bench was used to the change furrow distance depending on the plant growth stage (M treatment), the percentage of canopy light interception increased to ~90% at the early stage of plant growth (~20 days after transplanting). The percentage of canopy light interception for different treatments increased in the order of M > F1.0 > F1.6, and it increased towards the end of cultivation. In addition, the yield per unit area exhibited the same trend. Therefore, the solar radiation inside a greenhouse can be efficiently intercepted by plants when movable benches are used. This indicated that it was possible to increase plant yield per unit area using movable benches in plant cultivation.

Comprehensive Pricing Model of Urban Traffic Air Pollution Based on Bi-Level Programming

2012 ◽  
Vol 253-255 ◽  
pp. 1913-1917
Author(s):  
Ze Bin Zhao
Keyword(s):  
Air Pollution ◽  
Negative Impact ◽  
Urban Traffic ◽  
Vehicle Speed ◽  
Pricing Model ◽  
The Sustainable Development ◽  
Transport Services ◽  
Relationship Model ◽  
The Relationship

In order to reduce the negative impact of urban traffic air pollution, this paper firstly analyzes the relationship between urban traffic air pollution and vehicle speed, after providing the relationship model, the paper establishes a comprehensive pricing model of urban traffic air pollution based on bi-level programming, the model considers the traffic air pollution pricing, and includes the factors of congestion pricing, bus fee, pricing revenue redistribution on improvement of public transport services and the expansion of road capacity. The case study shows that the implementation of comprehensive pricing of urban traffic air pollution can reduce traffic pollution and unreasonable traffic flow, which is conducive to the sustainable development of the city.

scholarly journals Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0

2014 ◽  
Vol 7 (5) ◽  
pp. 2477-2484 ◽  
Author(s):  
J. C. Kathilankal ◽  
T. L. O'Halloran ◽  
A. Schmidt ◽  
C. V. Hanson ◽  
B. E. Law
Keyword(s):  
United States ◽  
Elevation Angle ◽  
Model Performance ◽  
Diffuse Radiation ◽  
The United States ◽  
Polynomial Model ◽  
Coefficient Of Determination ◽  
Data Set ◽  
Cubic Polynomial ◽  
Solar Elevation Angle

Abstract. A semi-parametric PAR diffuse radiation model was developed using commonly measured climatic variables from 108 site-years of data from 17 AmeriFlux sites. The model has a logistic form and improves upon previous efforts using a larger data set and physically viable climate variables as predictors, including relative humidity, clearness index, surface albedo and solar elevation angle. Model performance was evaluated by comparison with a simple cubic polynomial model developed for the PAR spectral range. The logistic model outperformed the polynomial model with an improved coefficient of determination and slope relative to measured data (logistic: R2 = 0.76; slope = 0.76; cubic: R2 = 0.73; slope = 0.72), making this the most robust PAR-partitioning model for the United States currently available.

scholarly journals Monitoring and Control Systems in Agriculture Using Intelligent Sensor Techniques: A Review of the Aeroponic System

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
Imran Ali Lakhiar ◽  
Gao Jianmin ◽  
Tabinda Naz Syed ◽  
Farman Ali Chandio ◽  
Noman Ali Buttar ◽  
...  
Keyword(s):  
Plant Growth ◽  
Nutrient Solution ◽  
Wireless Sensors ◽  
Fault Detection And Diagnosis ◽  
Monitoring And Control ◽  
Complete Control ◽  
Intelligent Sensor ◽  
Plant Cultivation ◽  
Wide Range ◽  
Detection And Diagnosis

In recent years, intelligent sensor techniques have achieved significant attention in agriculture. It is applied in agriculture to plan the several activities and missions properly by utilising limited resources with minor human interference. Currently, plant cultivation using new agriculture methods is very popular among the growers. However, the aeroponics is one of the methods of modern agriculture, which is commonly practiced around the world. In the system, plant cultivates under complete control conditions in the growth chamber by providing a small mist of the nutrient solution in replacement of the soil. The nutrient mist is ejected through atomization nozzles on a periodical basis. During the plant cultivation, several steps including temperature, humidity, light intensity, water nutrient solution level, pH and EC value, CO2concentration, atomization time, and atomization interval time require proper attention for flourishing plant growth. Therefore, the object of this review study was to provide significant knowledge about early fault detection and diagnosis in aeroponics using intelligent techniques (wireless sensors). So, the farmer could monitor several paraments without using laboratory instruments, and the farmer could control the entire system remotely. Moreover, the technique also provides a wide range of information which could be essential for plant researchers and provides a greater understanding of how the key parameters of aeroponics correlate with plant growth in the system. It offers full control of the system, not by constant manual attention from the operator but to a large extent by wireless sensors. Furthermore, the adoption of the intelligent techniques in the aeroponic system could reduce the concept of the usefulness of the system due to complicated manually monitoring and controlling process.

scholarly journals EFFICIENCY OF PLANT IRRADIATION IN PROTECTED GROUND STRUCTURES

2019 ◽  
Vol 54 (4) ◽  
pp. 100-105
Author(s):  
R.R. Galiullin ◽  
◽  
R.S. Aipov ◽  
R.B. Yarullin ◽  
◽  
...  
Keyword(s):  
Plant Growth ◽  
Energy Saving ◽  
Growth Phase ◽  
Stem Growth ◽  
Analytic Expression ◽  
The Relationship ◽  
Ground Structures ◽  
Led Irradiation ◽  
Irradiation Facilities

The advantage of LED lamps over conventional means of plant irradiation is described. An analytic expression is proposed to determine the relationship between LED lamp characteristics and plant parameters such as the stem growth and biomass. The formula also identifies the plant growth phase, which is crucial in development of automated energy-saving LED irradiation facilities for greenhouses.

scholarly journals The Relationship Model of Sharia and Financial Authorities

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Muhammad Maksum
Keyword(s):  
Political Economy ◽  
Financial Institutions ◽  
Middle Eastern ◽  
The State ◽  
State Authority ◽  
Relationship Model ◽  
Islamic Financial Institutions ◽  
The Relationship

Political economy and religious policies affect the relationship between sharia and financial authorities. Countries that make Islam as the official religion put Sharia authorities within the scope of the state. Malaysia is one of the countries that put Sharia authorities in the structure of state authority, although it is subject to independency. In the meantime, Indonesia combines the two models of relationship: 1) granting broader independence to sharia authority (the Indonesian Ulema Council) and 2) forming sharia board to deal with sharia finance, among others. The comparison of Indonesian, Malaysian, and the Middle Eastern countries’ system shows that the independence and the effectiveness of sharia economic fatwa application are found to attract each other. This, in turn, influences the supervision of Islamic financial institutions.  AbstrakPolitik ekonomi dan kebijakan agama memengaruhi hubungan antara otoritas syariah dan otoritas keuangan. Negara yang menjadikan Islam sebagai agama resmi menempatkan otoritas syariah dalam ruang lingkup negara. Malaysia adalah salah satu negara yang menempatkan otoritas Syariah dalam struktur otoritas negara, meskipun tetap independen. Sementara itu, Indonesia menggabungkan dua model hubungan: 1) memberikan independensi yang lebih luas kepada otoritas syariah (Majelis Ulama Indonesia) dan 2) membentuk dewan syariah untuk menangani hal yang berkaitan dengan keuangan syariah. Perbandingan sistem Indonesia, Malaysia, dan negara-negara Timur Tengah menunjukkan bahwa independensi dan efektivitas penerapan fatwa ekonomi syariah terbukti saling berhubungan satu sama lain. Ini, pada gilirannya, memengaruhi pengawasan lembaga keuangan Islam.

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