scholarly journals Comparison of Orchard Target-Oriented Spraying Systems Using Photoelectric or Ultrasonic Sensors

Agriculture ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 753
Author(s):  
Hanjie Dou ◽  
Changyuan Zhai ◽  
Liping Chen ◽  
Xiu Wang ◽  
Wei Zou
Keyword(s):  
Environmental Pollution ◽  
Detection Method ◽  
Fruit Trees ◽  
Tree Canopy ◽  
Ultrasonic Sensors ◽  
Adult Trees ◽  
Ground Deposition ◽  
Air Speed ◽  
Filter Papers ◽  
And Control

Orchard pesticide off-target deposition and drift cause substantial soil and water pollution, and other environmental pollution. Orchard target-oriented spraying technologies have been used to reduce the deposition and drift caused by off-target spraying and control environmental pollution to within an acceptable range. Two target-oriented spraying systems based on photoelectric sensors or ultrasonic sensors were developed. Three spraying treatments of young cherry trees and adult apple trees were conducted using a commercial sprayer with a photoelectric-based target-oriented spraying system, an ultrasonic-based target-oriented spraying system or no target-oriented spraying system. A rhodamine tracer was used instead of pesticide. Filter papers were fixed in the trees and on the ground. The tracer on the filter papers was washed off to calculate the deposition distribution in the trees and on the ground. The deposition data were used to evaluate the systems and pesticide off-target deposition achieved with orchard target-oriented sprayers. The results showed that the two target-oriented spraying systems greatly reduced the ground deposition compared to that caused by off-target spraying. Compared with that from off-target spraying, the ground deposition from photoelectric-based (trunk-based) and ultrasonic-based (canopy-based) target-oriented spraying decreased by 50.63% and 38.74%, respectively, for the young fruit trees and by 21.66% and 29.87%, respectively, for the adult fruit trees. The trunk-based target-oriented detection method can be considered more suitable for young trees, whereas the canopy-based target-oriented detection method can be considered more suitable for adult trees. The maximum ground deposition occurred 1.5 m from the tree trunk at the back of the tree canopy and was caused by the high airflow at the air outlet of the sprayer. A suitable air speed and air volume at the air outlet of the sprayer can reduce pesticide deposition on the ground.

Suggestions of China Participating in Global Recyclable Resources Circulation

2014 ◽  
Vol 1010-1012 ◽  
pp. 996-999
Author(s):  
Mo Zhang ◽  
Jing Chen
Keyword(s):  
Environmental Pollution ◽  
The Future ◽  
The Government ◽  
Recyclable Resources ◽  
And Control ◽  
Positive Effect

Development of recyclable resources industry makes a positive effect to alleviate the shortage of resources and control environmental pollution. At present, China's recyclable resources industry still has some problems. The Government should vigorously develop recyclable resources industry and participate in global recyclable resources circulation in the future.

A prey–predator model and control of a nematodes pest using control in banana: Mathematical modeling and qualitative analysis

2021 ◽  
pp. 2150089
Author(s):  
Sudhakar Yadav ◽  
Vivek Kumar
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Local Stability ◽  
Detection Method ◽  
Initial Release ◽  
Pest Detection ◽  
Predator Model ◽  
And Control ◽  
The Mathematical Model ◽  
Theoretical Results

This study develops a mathematical model for describing the dynamics of the banana-nematodes and its pest detection method to help banana farmers. Two criteria: the mathematical model and the type of nematodes pest control system are discussed. The sensitivity analysis, local stability, global stability, and the dynamic behavior of the mathematical model are performed. Further, we also develop and discuss the optimal control mathematical model. This mathematical model represents various modes of management, including the initial release of infected predators as well as the destroying of nematodes. The theoretical results are shown and verified by numerical simulations.

Response of Growth Inhibitor Paclobutrazol in Fruit Crops

Prunus ◽  
2020 ◽  
Author(s):  
Naira Ashraf ◽  
Moieza Ashraf
Keyword(s):  
Fruit Quality ◽  
Growth Inhibitor ◽  
Fruit Trees ◽  
Fruit Crops ◽  
Apical Buds ◽  
Return Bloom ◽  
Carry Over ◽  
Colour Development ◽  
Harvest Maturity ◽  
And Control

Paclobutrazol (PBZ; IUPAC name: (2RS, 3RS)-1-(4-chlorophenyl)-4, 4-dimethyl-2-(1H-1, 2, 4-triazol-1-yl) pentan-3-ol) is a triazol derivative and an antagonist of gibberellins. It has been shown to inhibit shoot growth in various perennial fruit trees. Paclobutrazol application reduced the number of shoots, transforming trees into a more desirable, spur-type growth habit as the vegetative sink was reduced. This compound induces an early and intense flowering, diminishing vegetative growth and reducing the extension of buds, allowing for ripening and the initiation of apical buds inflorescence. Besides, it also increases fruit set, the years following application as a carryover effect. An increase in return bloom is a common response to paclobutrazol treatment and has been reported for various fruit crops. Paclobutrazol is widely used to advance harvest maturity in various fruit crops and it improves fruit quality in terms of accelerated colour development, delayed and synchronized fruit maturation and control of preharvest fruit drop. It is known to improve fruit physical and fruit chemical characteristics. Fruit calcium is increased for 2–3 years due to carry over effect. It helps in the maintenance of better fruit quality during storage and influences nutrient uptake in various fruit crops including stone fruits. It has been characterized as an environmentally stable compound in soil and water environments with a long half-life under both aerobic and anaerobic conditions.

scholarly journals Corruption, Hidden Economy and Environmental Pollution: A Spatial Econometric Analysis Based on China’s Provincial Panel Data

2019 ◽  
Vol 16 (16) ◽  
pp. 2871 ◽  
Author(s):  
Shi Wang ◽  
Yizhou Yuan ◽  
Hua Wang
Keyword(s):  
Panel Data ◽  
Environmental Pollution ◽  
Environmental Quality ◽  
Spatial Econometrics ◽  
Interaction Effect ◽  
Spatial Econometric ◽  
Hidden Economy ◽  
Pollutant Discharge ◽  
And Control ◽  
The Impact

Previous studies show that the environmental quality is significantly influenced by corruption and the hidden economy separately. However, what is the impact of their interaction effect on environmental quality? Based on Multiple Indicators Multiple Causes (MIMIC) model, this study calculates the scale of hidden economy in Chinese provinces firstly. Then, we apply the method of spatial econometrics to analyze the interaction effect of corruption and the hidden economy on environmental pollution with China’s provincial panel data from 1998 to 2017. The results indicate that the interaction effect between corruption and hidden economy significantly increases pollutant discharge, suggesting that both anti-corruption and control of the hidden economy may improve environmental quality directly and indirectly.

Sign in / Sign up

Export Citation Format

Share Document