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  • Main » Articles » Plants defence

    System of defence of plants
    By large reserve of increase of harvest of agricultural cultures an increase of his quality is the competent, well organized protecting of plants from wreckers, illnesses and weeds. Close combination or integration of, biological, agronomical and other chemical methods of defence of plants is thus needed taking into account an economic situation which is folded.
    Sewn up plants to a great extent related to the wide use of chemical facilities - pesticides. A number of advantages has a chemical method and relatively effective. However, taking into account, that all отрутохімікати is in most cases toxic, using them is needed only since other receptions and methods are outspent. Taking of chemical defence of plants over weeds, wreckers and illnesses must be used taking into account concrete position on every field on the basis of information of economic threshold of harmfulness, with the observance of optimum terms and doses.
    By a term the economic threshold of harmfulness is usually named by such level of quantity of wreckers or development of illnesses of plants and weeds, below than what acceptance of protective measures it is not justified economic. For example, if it is sorry that is inflicted by a wrecker, estimated in 100 roubles on a hectare, at this his quantity, and defence of culture against this harmful organism costs 100 or more for roubles on a hectare, that acceptance of protective measures in this case is not justified. Opposite, at such closeness of популяції of wrecker, exciter of illness of plants and impurit by shivy plants, when harm, which is inflicted, approximately equals the cost of protective measures or higher such charges, acceptance of protective measures is expedient.
    Все facilities of chemical defence (pesticides) on their use it is possible to divide on:
    1 Herbicides
    2 Insecticides
    3 Fungicides
    4 Stains of seed
    5 Regulators growth of plants

    Category: Plants defence | Added by: Joni-Jo (15 May 2009)
    Views: 578 | Rating: 0.0/0 |
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