The study looked at how different amounts of phosphorus fertilizer affect rice yield. They used a specific type of rice called Yanfeng-47 and found that the right amount of phosphorus fertilizer can increase the number of effective panicles, spikelets, and dry matter accumulation in the rice plants. The highest yield was achieved with 6.0 kg of phosphorus fertilizer per 667 square meters, resulting in a 5.3% increase compared to not using any fertilizer at all.