The study looked at how adding nitrogen and phosphorus fertilizers affected the growth of berseem plants. They found that adding nitrogen increased the amount of forage and seeds produced by the plants, but only up to a certain amount. Similarly, adding phosphorus also increased the yield of the plants, but the effect was significant only up to a certain level. So, adding the right amount of nitrogen and phosphorus can help berseem plants grow better and produce more forage and seeds.