P

PVRO: Abbreviation for Plant Variety Rights Office. Helpful content: The Plant Variety Rights Office helps protect the intellectual property of plant breeders, encouraging innovation and the development of new plant varieties. Farmers benefit from access to improved seeds that enhance productivity and sustainability.

phosphorylation: The addition of a phosphate to a molecule. Understanding biochemical processes like phosphorylation aids in improving animal and plant health through better nutrition and disease management.

phytotoxin: A substance that is toxic to plants. Managing phytotoxins helps in protecting crops and ensuring healthy growth.

particle: A very small piece of a substance. Soil particles. Particles of volcanic ash were carried into the upper atmosphere. Understanding soil particle size and distribution aids in soil management and crop production.

parent material rock: The unweathered base rock which breaks down to form a constituent part of the surface soil. Knowing the parent material helps in soil fertility and management practices.

pest: An organism which attacks a plant or animal, causing damage and reducing the value of the crop or animal. Managing pests effectively prevents economic losses and ensures healthy crop and livestock production.

parthenocarpy: The production of seedless fruits without fertilization having taken place. Producing seedless fruits can meet market demands and reduce the need for pollination management.

polyethylene: Same as polythene. Helpful content: Polyethylene is widely used in agriculture for applications such as mulching, greenhouse covers, and irrigation tubing. Its durability and flexibility make it a valuable material for enhancing crop protection and water management.

peat: The accumulated partly decayed mosses and other plants which form the soil of a bog, often forming a deep layer. COMMENT: Acid peats are formed in waterlogged areas where marsh plants grow, and where the decay of dead material is slow. Black fen soils found in East Anglia are very fertile. These soils contain silts and calcium carbonate in addition to the remains of vegetation. Peat can be cut and dried in blocks, which can then be used as fuel. It is also widely used in horticulture, after drying and sterilizing. Peat was used as a fuel in some areas and was widely used in gardens to improve the texture of the soil or mixed with soil or other materials to grow plants in pots. These practices are now discouraged in order to prevent the overuse of peat bogs. Understanding peat and its uses helps in making informed decisions about sustainable soil management and conservation practices.

primitive: Referring to an early stage in an organism’s development. Helpful content: Understanding primitive traits in plants and animals can provide insights into their evolution and adaptation. This knowledge can inform breeding programs and conservation efforts on farms.