If you're a company dealing with agricultural machinery, there's a certain balance to be struck with your logo. While the agricultural sector is mostly focused on rustic elements, a simple life, hard work, and other similar principles, the machinery section of it is quite advanced. Since you'd be providing machinery, you want your logo to signify some technological advancement. Depending on the specific service or product you deal in, your company logo could represent robotics, sensors, or environmentally-conscious options for fertilizers, pesticides, etc.
The colors and design style of your agriculture machinery logo would also vary according to your line of work. If you provide robotic technology, for instance, you can use modern lines and shapes to represent your business. Since your target audience would most likely be automated farms or those in search of updates, you want to stand out as a provider of what they need.
The brand message for agriculture machinery would depend upon what your business goals are. If you have an aim towards environmental consciousness, for example, it's highly recommended to use green and perhaps some leaves in your logo along with the machines you supply. This would immediately give an impression of your products and services being more environmentally-friendly than other options. Farmers and other clients in the agriculture industry would hence approach you for their supplies if they're concerned about reducing their carbon footprint.
Since you represent machinery, it's probably not a good idea to make funky, artistic logos or use cartoon animals for your logo. This would not be in line with the usual tone of machinery, especially where the agriculture industry is concerned.
In order to make sure you check all the boxes for a perfect logo, invest in a logo designing expert. Such professionals can guide you towards the best kind of logo for your agriculture machinery business.