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shifting cultivation: An agricultural practice using the rotation of fields rather than of crops. Short cropping periods are followed by long fallows and fertility is maintained by the regeneration of vegetation. A form of cultivation practised in some tropical countries, where land is cultivated until it is exhausted and then left as the farmers move on to another area. In shifting cultivation, the practice of clearing vegetation by burning is widespread. One of the simplest forms involves burning off thick and dry secondary vegetation. Immediately after burning, a crop like maize is planted and matures before the secondary vegetation has recovered. Where fire clearance methods are used, the ash acts as a fertiliser. Farmers benefit from understanding and managing shifting cultivation for sustainable land use and productivity.

salivary gland: A gland which secretes saliva. Farmers benefit from understanding the function of salivary glands to maintain the digestive health of their livestock.

sweetener: an artificial substance such as saccharin added to food to make it sweet. Properly managing sweeteners ensures product quality and consumer health, supporting market value and farm profitability.

staple crop: A crop that is grown in large quantities and forms the basis of a traditional diet. Understanding staple crops helps farmers meet food security needs.

silty soil: Soil containing a high proportion of silt. Such soils are difficult to work and drainage is a problem. Farmers benefit from managing silty soils to improve drainage and soil structure.

stecklings: young sugar beet plants grown in seedbeds in summer, to be transplanted in the autumn or following spring. Properly managing stecklings ensures healthy growth and optimal yields of sugar beet crops.

saline: Referring to salt. Farmers benefit from managing saline conditions to ensure optimal soil health and crop growth.

sawfly: A family of insects, the larvae or caterpillars of which cause serious damage to fruit and crops. Farmers benefit from controlling sawfly to prevent crop damage and yield loss.

sell-by date: A date on the label of a food product which is the last date on which the product should be sold and can be guaranteed as of good quality. Farmers benefit from understanding sell-by dates for food safety and quality control.

support energy: the total energy expenditure necessary for the production of plant and animal agricultural foodstuffs. Properly managing support energy ensures efficient resource use and sustainability in agricultural production.

soil fertility: the potential capacity of soil to support plant growth based on its content of nitrogen and other nutrients. Managing soil fertility ensures healthy crop growth and optimal yields, supporting productive agriculture.

sideland: A strip of land left at the side of a field during ploughing. It may be ploughed up with the headlands. Farmers benefit from managing sideland for efficient land use and crop rotation.

sheep ked: Same as sheep tick. Farmers benefit from managing sheep ked infestations to protect livestock health and productivity.

soil-borne fungus: a fungus whose spores are carried in the soil. Managing soil-borne fungi protects crops from disease, ensuring healthy growth and better yields.

sludge: a thick wet substance, especially wet mud or snow; the solid or semi-solid part of sewage. Proper management of sludge ensures it can be used as a valuable resource for soil fertility and waste management, promoting sustainable agricultural practices.

salivate: To produce saliva. Farmers benefit from observing salivation patterns to detect potential health issues in livestock.

sclerotinia: A soil-borne disease affecting many crops, including potatoes, oilseed rape and peas. Farmers benefit from managing sclerotinia to protect crop health and prevent yield losses.

spray lines: a method of distributing irrigation water using flexible hose, mainly used for horticultural crops. Using spray lines ensures efficient water distribution, promoting healthy crop growth and sustainable water use.

sorghum: a drought-resistant cereal plant grown in semi-arid tropical regions such as Mexico, Nigeria, and Sudan. Latin name: Sorghum vulgare. Growing sorghum provides farmers with a resilient crop suitable for dry conditions, supporting food security and economic stability.

sickle: A curved knife-edged metal tool with a wooden handle, used for harvesting cereals. Farmers benefit from using sickles for manual harvesting and grass cutting.

straw burning: a cheap method of disposal of straw, which helps to control diseases. Properly managing straw burning ensures effective disease control while adhering to environmental regulations, supporting sustainable farming practices.