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Herbicides Calculator

Reduce pesticide and herbicide losses with IITA's herbicide calculator

The "IITA Herbicides Calculator" is a solution designed to address the prevalent issue of pesticide misuse resulting from inadequate calibration of spray tanks. It permits farmers to estimate the required quantity of herbicides for knapsack sprayers. This tool was developed using Java language, the Ionic framework, and Android Studio, ensuring its robustness and usability. Tested for effectiveness and reliability by researchers, this technology assists in calibrating the application of herbicides and other pesticides specifically for knapsack sprayers. It's important to note that the tool does not involve specific compositions or sequences of products or technologies.


This technology is TAAT1 validated.


Scaling readiness: idea maturity 7/9; level of use 7/9

30,000 USD

Cover training, android phones, data


Open source / open access


  • The widespread misuse of pesticides (including herbicides) due to poor calibration of spray tanks.
  • Loss of inputs (pesticides or herbicides) during applications.
  • Residue of chemical products in crops due to overdosing of pesticides or herbicides.


  • Accurate Quantity Estimation: The technology ensures the precise application of pesticides, mitigating issues related to over or under-dosing.
  • Promoting Effectiveness: "IITA Herbicides Calculator" promotes the effectiveness of herbicides, facilitating their optimal application.

Key points to design your business plan

This technology is beneficial for end users (Agro-chemical companies, farmers, spray service providers):

Using this technology aids in accurately estimating the herbicide quantity for knapsack sprayers, minimizing losses, and enhancing herbicide effectiveness.

 Regarding the cost structure:

  • The tool costs 30,000 USD.

  • Consider training, android phone, and data expenses.

No license is needed.

Estimate the profit realized from implementing this practice.


Positive or neutral impact

Adults 18 and over
Positive high
The poor
Positive medium
Under 18
Positive low
Positive medium

Positive or neutral impact

Climate adaptability
It adapts really well
Adaptability for farmers
It helps a lot
It doesn't hurt them
Carbon footprint
It doesn't reduce emissions at all
Soil quality
It doesn't harm the soil's health and fertility
Water usage
It uses the same amount of water

Countries with a green colour
Tested & adopted
Countries with a bright green colour
Countries with a yellow colour
Egypt Equatorial Guinea Ethiopia Algeria Angola Benin Botswana Burundi Burkina Faso Democratic Republic of the Congo Djibouti Côte d’Ivoire Eritrea Gabon Gambia Ghana Guinea Guinea-Bissau Cameroon Kenya Libya Liberia Madagascar Mali Malawi Morocco Mauritania Mozambique Namibia Niger Nigeria Republic of the Congo Rwanda Zambia Senegal Sierra Leone Zimbabwe Somalia South Sudan Sudan South Africa Eswatini Tanzania Togo Tunisia Chad Uganda Western Sahara Central African Republic Lesotho
Countries where the technology has been tested and adopted
Country Tested Adopted
Nigeria Tested Adopted

This technology can be used in the colored agro-ecological zones. Any zones shown in white are not suitable for this technology.

Agro-ecological zones where this technology can be used
AEZ Subtropic - warm Subtropic - cool Tropic - warm Tropic - cool

Source: HarvestChoice/IFPRI 2009

The United Nations Sustainable Development Goals that are applicable to this technology.

Sustainable Development Goal 3: good health and well-being
Goal 3: good health and well-being
Sustainable Development Goal 8: decent work and economic growth
Goal 8: decent work and economic growth
Sustainable Development Goal 9: industry, innovation and infrastructure
Goal 9: industry, innovation and infrastructure

  1. Enter Herbicide Dosage:  Input the recommended dosage of the herbicide in liters per hectare as indicated on the herbicide label.
  2. Measure Water Dispensed: Measure the volume of water dispensed on a 10m x 10m plot. (To calculate the water sprayed on a 10m x 10m plot, measure an area of 10m x 10m, equal to 100m². Fill water in your knapsack spray tank and spray the measured area following a straight path at a nozzle height equivalent to your knee level. Enter the volume of water dispensed from your knapsack spray tank onto the 10m x 10m plot.)
  3. Enter Knapsack Tank Capacity: Input the capacity of your knapsack spray tank in liters.
  4. Calculate Herbicide Dosage: Press the "Calculate Volume" button to obtain the precise dosage of the herbicide required to be added to your knapsack spray tank before filling it with water for spraying.

Last updated on 22 May 2024