The study looked at how different amounts of rice plants in a field affect the growth and yield of a specific type of rice called "Jinongda 7". They found that when there were fewer plants, the rice plants grew more tillers and leaves, and the growth period was longer. The number of panicles and grains, as well as the leaf area, also varied with plant density. However, the height of the plants only decreased significantly at one specific plant density. Surprisingly, the weight of the grains was not affected by plant density. The highest yield of rice was achieved with a plant density of 30cm x 19.8cm, producing 9,500 kg of rice per hectare.