The study looked at how high levels of ammonia in the air affect the way winter wheat plants photosynthesize. They tested two different types of wheat plants and found that when there was a lot of ammonia in the air and not much nitrogen in the soil, the plants had higher rates of photosynthesis and sugar production. However, when there was a lot of ammonia and plenty of nitrogen in the soil, the plants had lower photosynthesis rates. The type of wheat plant didn't seem to make a big difference in how they responded to the ammonia levels. Overall, the results suggest that high ammonia levels can help wheat plants that don't have much nitrogen in the soil, but more research is needed to understand this better.