Metode za merjenje vsebnosti vode v tleh

Urša PEČAN, Vesna ZUPANC, Marina PINTAR

Povzetek


Voda ima pomemben učinek na temeljne biofizikalne procese v tleh. Je eden izmed omejitvenih dejavnikov rasti rastlin, zato je spremljanje vsebnosti vode v tleh posebej pomembno v kmetijstvu. V prispevku predstavljamo trenutno uporabljane metode za meritve vsebnosti vode v tleh, njihove principe delovanja, prednosti, slabosti in načine uporabe. Zaradi razširjenosti uporabe v kmetijstvu in okoljskih znanostih smo se osredotočili predvsem na merilnike, ki merijo dielektričnost tal in jih uvrščamo v skupino elektromagnetnih metod. Raziskali smo vpliv talnih lastnosti na meritve z merilniki, ki merijo dielektričnost tal in opisali možne načine talno specifične kalibracije. Meritve vsebnosti vode v tleh so v kmetijstvu pomembne predvsem za uravnavanje obrokov namakanja. Z namakanjem na podlagi meritev lahko optimiziramo izrabo vodnih virov in zmanjšamo negativne učinke na okolje. Za pravilno delovanje tovrstnih merilnikov je potrebno preveriti ustreznost tovarniške kalibracijske funkcije. Posebno pozornost je potrebno posvetiti vgrajevanju merilnikov, saj prisotnost zračnih prostorov povzroča napake v meritvah.


Ključne besede


meritve; vsebnost vode; tla; natančno namakanje; merilniki; kalibracija; TDR; FD

Celotno besedilo:

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Literatura


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