Primerjalna analiza energetske bilance in potenciala globalnega segrevanja med pridelovalnima sistemoma sadovnjakov mandarin (Citrus tangerine Tanaka) in gojenjem soje (Glycine max (L.) Merr.)

Seyed Saeed HOSSEINI, Hassan FEIZI, Hamed KAVEH, Hossein SAHABI

Povzetek


Z namenom ovrednotenja in primerjave emisij toplogrednih plinov med pridelavo soje in mandarin je bil v provinci Golestan , Iran, izveden pilotni poskus. Za poskus je bilo z vprašalnikom izbranih 43 polj soje in 43 sadovnjakov mandarin z različnimi načini upravljanja. Emisije toplogrednih plinov so bile preučene z uporabo protokola potencialnega globalnega segrevanja (GWP). Rezultati so pokazali, da je predstavljala uporaba fosilnih goriv največjo porabo energije, tako pri soji (6906,5 MJ ha-1) kot pri mandarinah (17205,1 MJ ha-1). Najmanjši energetki vložek pri gojenju obeh kultur so predstavljala mikrohranila, 9 MJ ha-1 pri soji in 17,6 MJ ha-1 pri mandarinah. V obeh sistemih pridelave je bilo največ energije porabljene za spravilo pridelka. Pri pridelavi soje sta prispevala največji delež emisije toplogrednih plinov namakanje in setev, 387,7 in 109,4 kg CO2 ha-1, med tem, ko sta pri pridelavi mandarin k temu prispevala največ namakanje in spravilo pridelka, 5828,4 in 394,7 kg CO2 ha-1. Na splošno je bil energetski vložek pri pridelavi soje 17512,8 in pri pridelavi mandarin 33879,8 MJ ha-1. Celokupen izplen energije je bil pri soji 48310,5 in pri mandarinah 105463 MJ ha-1. Izračunana učinkovitost izrabe energije je bila za sojo 2,9 in za mandarine 3,3.

Ključne besede


mandarine; soja; učinkovitost izrabe energije; emisije toplogrednih plinov

Celotno besedilo:

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DOI: http://dx.doi.org/10.14720/aas.2021.117.2.1850

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