Nitrogen (N), Phosphorus (P) and Potassium(K). These are the most crucial elements however plants require many other elements to actively photosynthesis. These are calcium (Ca) magnesium (Mg) sulphur (S).
Plants also require what are know as trace or micro elements. The plants only require a small amount of the element but without it deficiencies will occur. Boron (B), Copper (Cu), Molybdenum (Mo), Manganese (Mm), Iron (Fe), Zinc (Zn) and Choride (Cl)
1. Chlorophyll
2. Magnesium
3.Tropopausium
oxygen, carbon, hydrogen
Hormones
The four stages of plant development are seed germination, seedling growth, vegetative growth, and reproductive growth. During seed germination, the seed sprouts and begins to grow. Seedling growth involves the development of the young plant above and below ground. Vegetative growth focuses on the growth of leaves, stems, and roots, while reproductive growth involves the production of flowers and fruits for reproduction.
To get better opportunities for growth and development
It is a plant growth hormone that stimulates seed germination, leaf development, and stem growth.
Earlier natural manure was used for plant growth and better yield.However with advancements in agricultural technology and research the elements responsible for growth, yield etc was found to be in the basic three elements-NPK (nitrogen,Phosphorus&Potassium).These elements as nitrates , sulphates & phosphates were used .The other micro nutrients like iron,sulphur etc were also traced to plant development over time.
they control a plant's patterns of growth and development, and the plant's responses to environmental conditions.
the irreversible change in size of cells and plant organs
Hormones.
Reproduction
To get better opportunity for growth and development
It is the minimum, maximum and optimum temperatures of plant growth and development.
Gibberellins are growth hormones that control plant height and bud development.