Plant density and rate of growth
As the population of plants in soil increases, the rate growth of the plants will be reduced.
Seeds need soil, heat, oxygen and water to germinate. Initially the food required for the seed to germinate is stored in the seed. As the seed starts to germinate, the roots will start to grow towards the soil and the sprout will grow upwards. As the first tiny leaves appear, photosynthesis is started.
In the next stage of growth the plant starts to compete for water and nutrients in the soil and also for sunlight and carbon dioxide above. Seeds that are planted too close to one another are known to grow taller initially to compete for sunlight. However this growth will not last long because as they grow bigger, the plants will have to compete for other resources in the soil like space for roots, water and nutrients.
In most cases, a high plant density will cause the plants to experience malnutrition, have stunted growth and eventually die. This is why in plantations the spacing between plants and plant density is always controlled to produce better yields.