In most Asian countries, farmers have smallholdings ranging from one to two hectares. The tractor-mounted boom sprayers cannot practically be used in small size farms with divided plots and complex terrain. To cope these issues, a prototype self-propelled crop sprayer was developed, including 20-hp engine, 300 L liquid tank, hydraulically-controlled spray eight hollow cone nozzles. symmetry of ...

Introduction. Rice grawing is an important branch of crop sector in Kuban, which produces about 80% Russian rice. One the significant factors reducing yield this presence high-stemmed weeds growing canals and on rollers rice paddy fields. The problem lack structural technological scheme for sprayer to protect irrigation system from reeds providing local treatment their panicles. When treating t...

The lever-operated knapsack sprayer, a manually operated piece of equipment, is widely used by Indian farmers for the application of agricultural chemicals. The study reported here is an ergonomics evaluation of one model of this type of sprayer. Data on 18 body dimensions and the shape of the back were collected for 10 subjects and their relevance in sprayer design are discussed. During the op...

A computational fluid dynamics (CFD) model of the air flow generated by an air-assisted sprayer equipped with two axial fans was developed and validated by practical experiments in the laboratory. The CFD model was developed by considering the total air flow supplied by the sprayer fan to be the main parameter, rather than the outlet air velocity. The model was developed for three air flows cor...

The increased concern about environmental effect of off-target deposits of pesticides use has resulted in the development of numerous spray drift models. Statistical models based on experimental field studies are used to estimate off-target deposits for different sprayers in various environmental conditions. Random-walk and computational fluid dynamics (CFD) models have been used to predict the...

variable rate application (vra) based on site specific crop management (sscm) is an effective approach for optimizing the application of agricultural inputs and preventing the undesirable environmental impacts. design, construction and evaluation of a map-based vra system was the main objective followed in this research. for variable rate application based on the generated map, a direct injecti...

This paper discusses the derivation of the best related linear dynamic system approximation to a tractorsprayer combination and a parametric model for the related linear dynamic system is identified. It will be of interest to check the degree of non-linearity in order to consider the validity of linear dynamic models. A simple method has been utilised based on the kernel idea of well-chosen per...

A self-propelled agricultural sprayer was modified to enable both front and rear wheel steering through electrohydraulic control valves. These modifications, in conjunction with a digital controller, enabled the vehicle to be four-wheel steered in multiple modes. The research focused on modeling and evaluating the effect of multi-mode four-wheel steering on vehicle handling characteristics and ...