Better Farming Series 10 - The Farm Business Survey (FAO - INADES, 1976, 38 p.)
 Part 2 - The farm business survey
 (introduction...) Why make a farm business survey? A farmer should know the size of his fields How to reckon the length and width of a field How to reckon the area of a field How to measure the weight of a harvest How to reckon the yield per hectare How to reckon receipts Explanations to help in answering the questionnaire

### How to reckon the yield per hectare

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