Environment electricity definition wikipedia


Even in Spain, the sun does not always shine and most crops are now grown in greenhouses covered with polythene. The polythene has to be replaced every three years or so and it can take up to five times the area of polythene greenhouses to produce the same quantity of tomatoes as in British glasshouses in a year. This means that in the 25 year life of a glasshouse (some are still being used after 50 years!) it could take 40 times the area of polythene to produce the same weight of tomatoes. gas definition state of matter What is polythene made from and what happens to it after use?

The tobacco whitefly has become a serious problem because there is a much greater reliance on pesticides in southern Europe than in Britain. It has become resistant to many of these pesticides, which no longer give good control as a result. So far we have managed to keep Bemisia out of the UK and do not have its associated virus to contend with. We have also taken much more stringent precautions against viruses and viroids such as Pepino Mosaic virus (PepMV) and Columnea latent viroid (CLVd) than in other European countries.

During this period the majority of the production area was converted to use natural gas for glasshouse heating, resulting in less of the sulphur emissions which would come from burning oil or coal. pictures electricity pylons Carbon dioxide can also be extracted from the clean exhaust gases when burning gas, to enrich the glasshouse atmosphere with CO 2. This gives big production and quality benefits as well as further reducing atmospheric CO 2 emissions. Combined Heat and Power (CHP)

Combined Heat and Power (CHP) is one of the most exciting technical opportunities for the UK tomato industry. electricity lab activities It involves the siting of electricity generating stations on tomato nurseries. These systems are fuelled by natural gas and produce electricity, which is then supplied to local homes, hospitals and businesses through the national grid. The heat which is generated is then used to heat the glasshouses, rather than being wasted through the cooling towers needed at conventional power stations. Electricity is generated at around 80% efficiency compared with the 30% in those conventional power stations, which would otherwise produce this power. These systems are also now being fuelled by biogas produced by digesting vegetable waste, crop residues or using crops grown specifically for this purpose.

Tomato crops are also being heated by surplus energy from industrial processes, which would otherwise be wasted. CO 2 generated from these processes, is also used to supplement the glasshouse atmosphere to stimulate growth and production and reduce the loss of this CO 2 to the environment. One example of this sort of opportunity is the development of glasshouse tomato production alongside British Sugar’s refinery in Norfolk.

This simple system is very effective. world j gastrointest surg impact factor Pests have become resistant to many insecticides. This means they no longer work. a level physics electricity questions and answers Another bonus is that glasshouse workers no longer come into contact with chemical pesticides and neither do the two million bumblebees which are used by all British tomato growers to pollinate their crops. Bees don’t like pesticides either!

The other reason British tomato growers can make this approach work is that they have sophisticated glasshouses in which the environment can be precisely controlled. This also reduces the risk of tomato plants becoming diseased. For example, potato blight can be a serious problem, especially during wet summers. It does not affect commercial British tomato crops simply because growers are able to keep their plants dry. electricity production in india This is not possible with outdoor crops or those grown under plastic in southern Europe.

Tomato growers were among the first to develop Integrated Crop Management (ICM) production protocols with their customers. These became the NFU/Retailer ICM protocols, now the ’Red Tractor Farm Assurance’ (RTFA) Protocols. Glasshouse tomato growers currently represent a higher level of registration and compliance with the RTFA scheme than those of any other crop. o gosh A little red tractor on food packs means they have been produced according to this scheme.

Nutrient and water recirculation systems, such as the nutrient film technique (NFT), were developed in the UK. NFT is used by a number of tomato growers and this eliminates all nutrient loss to the environment, except that from final plant decomposition. The plant roots are bathed in water and nutrients, which then drain into tanks before being checked, adjusted and reused. Glasshouses now being built for tomato production have the facility for water and nutrient recirculation.

Around three-quarters of current UK tomato consumption is of imported fruit. inert gas definition chemistry Most are from Holland, Southern Spain, the Canary Islands and North Africa. Delivery to British supermarket shelves requires lengthy transport by road or sea. As a consequence, imported fruit can be well over 7 days old before it arrives on supermarket shelves! British tomatoes can be picked today and in stores within 24 hours!