The combine harvester is one of the most important inventions in modern agriculture. It integrates multiple processes—including harvesting, threshing, separation, and cleaning—into a single machine. The use of a harvester enables the entire grain harvesting operation to be completed in a single pass. Against the backdrop of rising labor costs and tight harvesting windows, the widespread use of combine harvesters has become a key method for grain harvesting. This ensures efficient grain production and reduces operational costs.
The Purpose of Combine Harvesters in Agriculture
A combine harvester is a large agricultural machine that integrates harvesting, threshing, separation, and cleaning functions. It is used for completing all the major steps of grain harvesting in a single pass through the field.
Traditional manual harvesting requires completing several separate steps in sequence, such as cutting, transporting, threshing, and winnowing. It’s fragmented and time-consuming. The core value of a combine harvester lies in integrating these major processes into a single, continuous operation. After the crops enter the harvesting machine through the header, they pass through the threshing drum to separate the grain, then through a vibrating screen and a blower to remove impurities. Finally, the clean grain is stored in the grain bin, while the straw is shredded and returned directly to the field.
Based on actual data, a mainstream model of combine harvester can cover an average of 80–150 mu per day. Its operational efficiency is equivalent to that of dozens or even hundreds of manual laborers combined. This efficiency advantage has enabled it to play a dominant role in the harvesting of major crops such as rice, wheat, corn, and soybeans. We’ll provide a systematic overview of how combine harvesters are used.
Combine harvester use can address the following three core issues:
- Labor shortage: The ongoing outflow of rural labor has led to an increasingly acute shortage of workers during peak farming seasons.
- Low harvesting efficiency: Manual harvesting takes a long time, making it difficult to complete the work within the optimal harvest window.
- Harvest losses: Traditional manual harvesting results in high loss rates during transportation and sun-drying.
In the Indian market, the states of Punjab and Haryana are the country’s primary grain-producing regions. Combine harvesters have been widely adopted for rice and wheat harvesting. The rate of mechanized harvesting has exceeded 70%, making it an important model for agricultural mechanization in Southeast Asia.
The Main Crops That Can Be Harvested with a Combine Harvester
Combine harvesters are suitable for harvesting a variety of major food crops and cash crops, including rice, wheat, barley, corn, soybeans, sunflowers, groundnuts, and sugarcane. Different crops vary significantly in terms of plant morphology, grain size, moisture content, and straw strength. In actual operation, you need to adjust the combine harvester parameters according to the specific characteristics of each crop. Below, we have selected four representative crops to illustrate the harvesting strategies required for each.
- Rice and Wheat
Rice and wheat are the two grains with the largest global cultivation areas, are also the most common application targets for combine harvesters. For both crops, threshing rate and breakage rate are the core performance indicators, but the requirements differ. Rice grains have a high moisture content and are tightly enclosed by their glumes, so you need to appropriately increase the threshing cylinder speed and maintain a relatively large concave clearance. Wheat grains, on the other hand, are dry and easy to thresh, so the speed should be reduced to prevent excessive breakage.
If you practice a rice-wheat rotation, Wubota rice combine harvesters can help you solve this problem. They utilize flexible threshing technology combined with an adjustable threshing cylinder and concave clearance design. You only need to adjust the parameters for different crops without replacing any core components. A single machine can cover the harvesting needs of both seasons throughout the year, eliminating the cost of purchasing separate models for each crop.
- Corn
Corn plants are tall with sturdy stalks, and the ears are positioned relatively high on the plant. This places specific demands on the header structure and conveyor system of the combine harvester. Corn harvesting involves multiple operations, including ear snapping, husking, threshing, and straw handling. The key challenge is to minimize grain loss and ear damage during the snapping process. If you grow corn, we recommend selecting a model equipped with a dedicated corn header and husking device. Wubota corn harvesters are compatible with 3 row spacing configurations, helping you keep harvest losses to a low level.
- Groundnut
Groundnut is a root crop, and its harvesting involves a series of steps including digging, soil shaking, pickup, and pod stripping. The key lies in controlling the digging depth and angle to minimize pod loss and damage. Whether your field soil is sandy loam or light clay, Wubota groundnut harvesters can effectively reduce the pod loss rate and damage rate, preserving the commercial value of the groundnuts.
- Sugarcane
Sugarcane plants are tall with hard stalks. This places high demands on the strength and wear resistance of the harvester’s cutting and conveyor systems. Sugarcane harvesting requires multiple operations including topping, cutting, leaf stripping, segmenting, and collection. Cutting quality also directly affects the ratooning rate of the next season’s perennial sugarcane. If you grow sugarcane, you need a harvester equipped with a powerful disc cutter and a high-efficiency leaf-stripping device. Wubota crawler type sugarcane harvesting machine is designed to handle field operations across a range of row spacings and planting densities, helping you significantly reduce the labor intensity of manual harvesting.
The use of a combine harvester is primarily limited to the grains mentioned above and certain oilseed crops. Certain fruits (such as mangoes and bananas), vegetables (such as tomatoes and chili peppers), and other crops that require careful harvesting are still harvested by hand because of their delicate nature. Combine harvesters are not yet capable of replacing manual harvesting for these crops.
The Main Areas Where Combine Harvesters Are Used
The application of combine harvesters is closely related to geographical conditions, cropping patterns, and crop types. Globally, this type of equipment is primarily concentrated in large plains and major grain-producing regions. However, harvesters for different crop types have their own distribution patterns in target markets. Based on Wubota’s actual delivery cases, we have outlined the applicable regions for harvesters of several major crop types.
- Rice Harvesters—The Standard Equipment in Plain Farming Regions
Taking rice and wheat harvesters as examples, their primary markets are concentrated in large-scale rice-wheat rotation zones in Asia and North America. In India, the rice-wheat belt is where combine harvesters are most widely used. Wubota rice combine harvesters already have a localized service network in these areas, capable of providing local farmers with one-stop support ranging from model selection to after-sales service.
- Groundnut Harvesters—A Growth Point in Emerging Markets
Groundnut is an important cash crop. The demand for mechanized groundnut harvesting is growing rapidly in Africa and Southeast Asia. Wubota groundnut combine harvesters have already gained recognition among local farmers and agricultural cooperatives in Africa. In addition, groundnut-growing regions in Southeast Asian such as Vietnam represent key markets for our groundnut harvesters. The demand from small-scale farmers for high-efficiency, low-damage groundnut harvesting equipment continues to rise.
- Sugarcane Harvesters—A Critical Need in Tropical Regions
The primary market for sugarcane harvesters is concentrated in major sugarcane-producing countries in tropical and subtropical regions. Brazil, as the world’s largest sugarcane producer, has a high level of mechanized harvesting and therefore maintains a steady demand for sugarcane harvesters. In Australia, sugarcane cultivation areas employ intensive farming models, placing strict demands on the operational precision and reliability of the equipment. Wubota sugarcane harvesters have been put to work in both markets. The cutting systems and leaf-stripping mechanisms of our equipment have been optimized for local sugarcane varieties and row spacing, enabling them to meet the operational standards of large-scale farms.
Before deciding whether to introduce a particular type of combine harvester, you should conduct a comprehensive evaluation. The selection decision should be tailored to local conditions to maximize the equipment’s return on investment.
The Working Principle of a Combine Harvester
Combine harvester work is a continuous assembly-line process. As the machine moves through the field, it sequentially completes six major stages: harvesting, conveying, threshing, separation, cleaning, and unloading. There is no need to stop the harvesting machine to switch between these stages. Let’s take a look at how a combine harvester works. The specific workflow is as follows:
Reaping
The reel first directs the upright or slightly lodged crops toward the cutter. The cutter severs the stalks near the base of the plants, allowing the crops to feed orderly into the machine inlet.
Conveying
The harvested crops, along with their stalks and heads, are gently fed into the threshing system via a screw conveyor or chain conveyor. The key to this process is ensuring a continuous and even flow of material and preventing blockages.
Threshing
Once the crop enters the clearance between the threshing cylinder and the concave, it is subjected to the impact, rubbing, and vibration actions of the high-speed rotating cylinder, causing the grain to detach from the earhead. This accomplishes the initial separation of the kernels from the rachis.
Separating
The threshed mixture (grains, broken straw, husks, etc.) enters the separation system, which is typically accomplished by a rotating straw walker or separating drum. This stage utilizes centrifugal force to discharge the longer straw toward the rear of the harvesting machine. The shorter grains and chaff then fall through the grates and screens to the next stage.
Cleaning
The falling material then enters the cleaning system, where the vibrating sieve and the blower operate in coordination. The airflow generated by the blower blows the light impurities (husks, leaf fragments, and dust) out of the machine, while the vibrating sieve separates the clean grain by particle size. Through this stage, the clean kernels are finally delivered into the grain tank, while the impurities are discharged from the machine.
Unloading
Once the clean grain in the grain tank reaches a predetermined capacity, it is discharged via the unloading auger or unloading tube. Then it is transferred into a trailer or transport vehicle, thereby completing the entire harvesting process.
From the cutting of the crop to the delivery of grain into the tank, all operations run simultaneously and continuously. This is why the machine is named the “combine” harvester.
The Key Parts of a Combine Harvester
A combine harvester consists of multiple modules working in coordination. Each component has a clearly defined role, and together they complete the entire operation from harvesting to unloading the grain. Combine harvester components and functions are as follows:
| Components | Functions |
| Header | It is located at the front of the machine and is used to cut and convey the crop. |
| Reel | It sweeps the standing or slightly lodged crop toward the cutter bar while lifting and guiding it to ensure smooth cutting. |
| Cutter Bar | It is the working component used to sever the crop stalks. It consists of the knife section assembly, hold-down clips, guard fingers, wear plates, the guard bar, and the fastening and connecting hardware. |
| Header Auger | The crop is conveyed to the inlet of the feeder house through the spiral action of the auger flighting. The eccentric retractable finger mechanism works with the conveyor slats to deliver the crop into the feeder house. |
| Conveyor | The feeder chain uniformly conveys the crop through the feeder house. The crop is then fed into the threshing cylinder for threshing and separation. |
| Threshing Drum | The crop is subjected to high-speed impact and rubbing action within the threshing cylinder, ensuring thorough separation of the grain from the straw. |
| Grain Tank | Located at the upper or rear of the machine, the grain tank is used for temporary storage of cleaned grain. |
| Straw Management System | Located at the rear of the machine, it can either chop the discharged straw for direct field incorporation, or windrow it for subsequent baling and collection. |
The Benefits of Using a Harvester in Agriculture
Advantages of using combine harvesters in agriculture are primarily reflected in operational efficiency, cost control, resource utilization, and long-term soil fertility maintenance.
- Labor Savings: A combine harvester requires only 1–2 operators to complete large-scale harvesting operations. Taking a medium-sized model as an example, the daily output of a single machine is equivalent to the combined output of 30–50 laborers. This significantly deals with the problems of labor shortages in your region and high labor costs during the busy farming season.
- Shorter Harvest Cycle: Grain harvesting has a relatively strict time window. Harvesting too early or too late can affect both yield and quality. Mechanical harvesting allows for rapid completion of the harvest during the optimal maturity period. This shortens the time spent drying the grain in your field and reducing the risk of yield losses caused by terrible weather conditions.
- Minimized Harvest Losses: Combine harvesters ensure standardized field performance. Total grain losses across cutting, threshing, and cleaning are generally kept below 3%. Mechanized operations offer greater uniformity than manual work, significantly cutting down losses from inadequate threshing and grain spillage during transport.
- Straw Resource Utilization: Machines equipped with straw collection or baling devices can gather straw into bales. The straw can be sold to biomass power plants as fuel. It can also be used as roughage for livestock farming, providing farmers with an additional source of income. What’s more, straw chopping and incorporation into the field can increase soil organic matter.
Why Do We Use The Wubota Combine Harvester in Agriculture?
A suitable combine harvester must not only be suited to the terrain in your region but also compatible with the main types of crops you grow. Furthermore, you should consider the equipment’s total cost of ownership and return on investment.
This is precisely the starting point for Wubota’s product design. For rice-wheat rotation areas, we offer multifunctional harvesters that serve dual purposes, allowing you to cover the entire year’s harvesting needs with a single machine. For crops such as corn, groundnuts, and sugarcane, we have corresponding specialized models, and we have already completed actual machine deliveries and localized adaptations in target markets such as Africa, Vietnam, Australia, and Brazil.
In addition, there’s one more thing you might be particularly concerned about—after-sales service and spare parts. Agricultural machinery operations are highly seasonal, and any downtime during the harvest window can result in incalculable losses. To address this, we have established a comprehensive spare parts supply system with ample inventory of key components. Furthermore, our system is highly compatible with the spare parts systems of leading brands such as Kubota and Yanmar. This means that even in remote regions, you can find available replacement parts in short time, significantly reducing wait times for machine repairs and maintenance.
Conclusion
Whether you’re in a rice-wheat rotation area, a groundnut-growing region, or a sugarcane plantation, we can provide tailored recommendations and localized service solutions based on the size of your land, crop type, and budget.
If you’re considering investing in new equipment for the next harvest season, please feel free to contact us. Our technical team is ready to help you assess your specific operational needs and recommend the combine harvester model best suited for your field.
