The efficient distribution of manure and slurry is essential for the chemical and structural correction of the soil, ensuring greater productivity and agricultural sustainability. Two of the main technologies used in this process are DPA (Proportional Feed Rate) and VRT (Variable Rate Technology). Although both have the aim of improving the application of organic fertilizers, each acts differently and can be used together to optimize results.

 

DPA - Debit Proportional to Advance

The DPA automatically adjusts the distribution rate according to the tractor's speed, ensuring that the amount of manure or slurry applied per square meter remains constant, regardless of speed variations.

Advantages
Maintains a uniform dosage and avoids waste.
Simple to operate and adjust.
Reduces the risk of over- or under-application at different points on the plot.

Limitations
Does not take into account variations in soil requirements.
Relies on prior calibration to ensure accuracy.

In the context of chemical and structural soil correction, DPA ensures that organic matter and nutrients are applied evenly, promoting improvements in water retention, soil structure and crop nutrition.

 

VRT - Variable Rate

VRT, in turn, adjusts the amount of fertilizer distributed according to the specific needs of each soil zone, based on prescription maps or real-time sensors. With this technology, it is possible to carry out a more efficient and targeted application, correcting nutritional and structural deficiencies in the soil with greater precision.

Advantages
Adjusts fertilization to the real needs of the soil.
Reduces costs and environmental impact by avoiding waste.
Improves nutrient efficiency and crop productivity.

Limitations
Requires prior soil analysis and plot mapping.
Higher initial investment due to the need for on-board technology.

 

Definition of Fertilizer Adjustments in the Use of VRT

To get the most out of VRT, you need to follow a structured process to define fertilizer adjustments in advance.

 

1. Soil Analysis and Parcel Mapping

• • Carry out soil sampling to identify nutrient and organic matter levels.
  • Use sensors, GPS, drones or satellites to map fertility variations on the plot.

2. Creating the Prescription Map

• • Based on the soil analysis, generate a prescription map with the optimum application quantities for each zone.
  • Consider the history of the plot and the fertilization objectives.

3. Configuring the VRT system on the equipment

• • Load the prescription map into the spreader or tank controller.
  • Calibrate the system to ensure that the distribution corresponds to the recommendations on the map.

4. Real-time monitoring and adjustments

• • NIR (Near Infrared) sensors can be used to measure the composition of the slurry and adjust the dose automatically.
  • The operator can monitor and correct the application via the device's terminal.

 

In short, both DPA and VRT play an essential role in organic fertilization management. DPA ensures homogeneous distribution adjusted to the speed of the tractor, while VRT allows for a more precise and optimized application, correcting specific soil deficiencies. The combination of these technologies improves the efficiency of organic fertilizers, promoting more fertile, productive and sustainable soil.