Here I would like to introduce a yield model that offers realistic harvesting and sowing. These factors, of course, differ from region to region, but your game should, in any case, extend this way. Amounts have been calculated taking into account the weight of the relevant crop type!

Example of Sowing Calculation:
40 (grain millimeter): 90 (germination) x 400 (grain number / square meter) = 180 kg / ha x 0.7 (wheat density)
250 l / ha: 10 000 = approx. 0.025 liters per square meter (value in yield)
Sowing: wheat: 180 kg / ha
Barley: 190 kg / ha
Rape: 3 kg / ha
(Maize, sugar beet and soy beans are roughly adapted)
Harvest: wheat: unadjusted 50 dt / ha, 100% yield increase 100 dt / ha
Barley: unrefined 40 dt / ha, 100% increase in yield is 80 dt / ha
Rape: Inaccurate 30 dt / ha, 100% increase in yield is 60dt / ha

You can also simply change the values ​​according to your yield preferences.
I wish a lot of fun with the modem!