Often gardeners meet definitions ""lutrasit No. 17"", ""spunbond No. 30"", ""agrit No. 60"". What is designated by these digits?
Lutrasil, Spunbond, Agril and also Agrospan, AgroSUF, Agrotex are signature names of the nonwoven ukryvny fabrics used in agriculture and on seasonal dachas.
All these ukryvny materials are similar both in method of application, and in structure and properties. They are produced from polypropylene on the Spunbond technology (fusion of polymers in the filyerny way) and differ from each other a little.
Materials are subdivided on density and color. Measuring unit of density is the specific weight of material. For example, at lutrasil No. 17 density is 17 grams on 1 sq.m. The fabric, the more its weight in terms of sq.m. is more dense. For example, spunbond No. 60 has density of 60 g/sq.m.
Thin lutrasit No. 17 has excellent svetoperedacha (misses 80% of sunlight) and is used for photophilous plants, will protect from frost not below - 3 wasps. Besides, it easy, and without problems can cover gentle shoots without risk to rumple them. Thanks to these qualities, thin spunbond is applied since April before harvesting including for protection against such wreckers as onions fly, cabbage white butterfly, flea beetle cruciferous.
Lutrasil No. 30 (30 g/sq.m.) a little more dense, he can already be used not only for cover of shoots on beds, but also for creation of tunnel hotbeds. Such material will protect from frosts - 5 wasps and also from hail and wind. It misses 65% of sunshine and can be used in the summer for shading of plants during strong heat.
It is similar previous on properties lutrasit No. 42.
Lutrasil with a density of 60 g/sq.m. quite dense and perfectly is suitable for covering of hotbeds and greenhouses. He reliably protects plants from wind and frosts to - 10 wasps. He is usually used for protection of plants for the winter and also cover the earth at the long snowless period.
Spunbond of 60 g/sq.m. of black color is used usually for mulching of the soil that allows to reduce quantity of weed vegetation much more. Cultural plants land in cut on the surface of material. They quite comfortably feel as the shelter creates the increased humidity in the soil, keeps heat and suppresses the competition from weeds.
All types of spunbonds, white and black, perfectly pass moisture therefore watering is made, without removing the shelter. It is very convenient, especially for the mulching materials.