PhantomX7412

I have a problem. Now I have a summer season, my beds are on chernozem, with all fertilizers. But the growth rate, for example, is N 30%. Wikipedia says that you need to wait 3-4 game hours to update the amount of nutrients. I slept for 3-4 game hours, nothing has changed, I sat near the crops for 3-4 game hours, nothing has changed. At the same time that the crops were not shown. What am I doing wrong?

Thanks

The month of December. The greenhouse is built correctly, all beds with a status of +5 to temperature, chernozem + fertilizers. But the growth is delayed due to the cold weather, it will give only 50% of production. Flax. What am I doing wrong?