It helps a plant convert other nutrients into usable building blocks with which to grow
The progression of a cannabis phosphorus deficiency. Cannabis plants tend to love phosphorus in the flowering/budding stage and it is unlikely for a cannabis plant to get too much phosphorus using standard nutrients formulated for a flowering plant like cannabis.  Since most plants in the garden are grown for their flowers or fruit, replacing phosphorus in the soil if it is lacking is very important. There are many chemical fertilizers that can help you with replacing phosphorus and getting a good nutrient balance in your soil. There is no understating the importance of phosphorus in plant growth. Without it, a plant simply cannot be healthy. The basic function of phosphorus makes it possible to have beautiful and abundant plants in our gardens. Phosphorus deficiency is a plant disorder associated with insufficient supply of phosphorus. Phosphorus refers here to salts of phosphates (PO 4 3−), monohydrogen phosphate (HPO 4 2−), and dihydrogen phosphate (H 2 PO 4 −). Phosphorus deficiency is most common in areas of high rainfall, especially on acid, clay or poor chalk soils. Cold weather can cause a temporary deficiency. All plants may be affected, although this is an uncommon disorder. A lot of the phosphorus in soils is also unavailable to plants. Soil phosphorus becomes unavailable to plants through several routes: 1  Bacteria: Bacteria convert plant-available phosphate into organic forms that are then not available to plants. 2  Although other bacteria make phosphate available by mineralisation, the contribution of this is small. Phosphorus moves in a cycle through rocks, water, soil and sediments and organisms. Here are the key steps of the phosphorus cycle 1  : Over time, rain and weathering cause rocks to release phosphate ions and other minerals. 2  This inorganic phosphate is then distributed in soils and water. The function of phosphorus in plants is very important. It helps a plant convert other nutrients into usable building blocks with which to grow. Phosphorus is one of the main three nutrients most commonly found in fertilizers and is the “P” in the NPK balance that is listed on fertilizers. There is no understating the importance of phosphorus in plant growth. Without it, a plant simply cannot be healthy. The basic function of phosphorus makes it possible to have beautiful and abundant plants in our gardens. Phosphorus is an essential macro-element, required for plant nutrition. It participates in metabolic processes such as photosynthesis, energy transfer and synthesis and breakdown of carbohydrates. Phosphorus is found in the soil in organic compounds and in minerals.  Phosphorus supports the transfer of energy in plants, which is a different role from other plant nutrients, such as nitrogen. Nitrogen is part of the chlorophyll molecule and is needed for vegetative growth, but phosphorus promotes root growth, flowering and setting seed. High levels of phosphorus occur in seeds and fruit, and plants low in phosphorus have a small fruit set. Other signs of phosphorus deficiency include delayed maturity and reduced growth. Deficient plants may show purple coloring in the older leaves Importance of Phosphorus to Plants. Phosphorus is a component of the complex nucleic acid structure of plants, which regulates protein synthesis. Phosphorus is, therefore, important in cell division and development of new tissue. Phosphorus is also associated with complex energy transformations in the plant. Adding phosphorus to soil low in available phosphorus promotes root growth and winter hardiness, stimulates tillering, and often hastens maturity. High Phosphorus in Your Soil. It is very difficult for a plant to get too much phosphorus due to the fact that it is difficult for plants to absorb phosphorus in the first place. There is no understating the importance of phosphorus in plant growth. Without it, a plant simply cannot be healthy. The basic function of phosphorus makes it possible to have beautiful and abundant plants in our gardens. Phosphorus is a macronutrient that plays a number of important roles in plants. It is a component of nucleic acids, so it plays a vital role in plant reproduction, of which grain production is an important result. It is also critical in biological energy transfer processes that are vital for life and growth. The availability of phosphorus to crops is more than just having phosphorus in the soil. It will depend on soil pH, how supplemental phosphorus is applied, crop root growth, and the other management factors that influence root growth.
http://www.growweedeasy.com/phosphorus-deficiency-cannabis http://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm https://en.wikipedia.org/wiki/Phosphorus_deficiency http://sciencelearn.org.nz/Contexts/Soil-Farming-and-Science/Science-Ideas-and-Concepts/The-phosphorus-cycle http://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm http://www.smart-fertilizer.com/articles/phosphorus http://www.ehow.com/about_4587203_what-does-phosphorus-do-plants.html http://passel.unl.edu/pages/informationmodule.php?idinformationmodule=1130447043&topicorder=2&maxto=15 http://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm http://extension.psu.edu/plants/nutrient-management/educational/soil-fertility/managing-phosphorus-for-crop-production
what does phosphorus do plants