Better Farming Series 10 - The Farm Business Survey (FAO - INADES, 1976, 38 p.) |

Part 2 - The farm business survey |

To find out if the harvest has been good, you often need to reckon how many kilogrammes you would have harvested if you had a field of one hectare.

When you have worked out this Figure, you have reckoned the yield per hectare. Example:

I have a field of groundnuts that is 54 metres long and 22 metres wide. The area is: 54 m x 22 m = 1188 m². I harvested 94 kg of groundnuts from this field.

What is the yield per hectare?

To work this out, I use what is called the rule of three, thus:

From an area of 1 188 m² I harvested |
94 kg |

For 1 m² I would have harvested |
94 kg/1188 |

For 1 ha (or 10000) m² I would have harvested |
94 x 10000/1188= 791 kg |

Another example:

I have a field of maize which is 165 metres long and 74 metres
wide.

Its area is 165m x 74m= 12210 m².

I harvested 924 kg of maize
on this field.

What is the yield per hectare?

I use the rule of three:

On an area of 12 210 m² I harvested |
924 kg |

On 1 m² / would have harvested |
924/12210 |

On 10 000 m² for 1 ha) I would have harvested |
924 x 10000/12210 = 756.7 kg |