Pošlji prispevek (e-pošta) Odziv sladke koruze na različne namestitve namakalnih naprav v suhem sredozemskem območju
Povzetek
Povečevanje razdalje med namakalnimi cevmi je najpomembnejši dejavnik pri zmanjševanju začetnih stroškov pri namestitvi namakalnega sistema. Za ovrednotenje učinkov različne namestitve namakalnih cevi (75, 150, 225, in 300 cm) na pridelek sladke koruze, stanja vode v tleh in na učinkovitost zalivanja (IWUE) je bil izveden dvoletni poljski poskus (2017 in 2018) v sušnem sredozemskem območju. Rezultati so pokazali, da sta se poprečni pridelek oličkanih storžev (ICY) in učinkovitost zalivanja (IWUE) značilno zmanjšala s povečevanjem razdalje med zalivalnimi cevmi. HCY je bil 13,93, 12,30, 9,18, in 6,86 t ha-1, pri razmaku zalivalnih cevi 75, 150, 225, in 300 cm, pri poprečni globini zalivanja 725 mm. Z oddaljenostjo od namakalnih cevi sta se zmanjševala pridelek in vsebnost vode v tleh. Namestitev namakalnih cevi na 150, 225 in 300 cm je dala za 11,7, 34,0 in 50,8 % manj pridelka v primerjavi z namestitvijo na 75 cm, a je imela ta namestitev namakalnih cevi za 50, 67 in 75 % manj stroškov na enoto površine. Kljub temu zmanjšanje pridelka ni upravičilo dodatnih stroškov za gostejšo namestitev namakalnih cevi zaradi nizkih cen pridelka in visokih stroškov namakalnih cevi. Zaključimo lahko, da so potrebne dodatne raziskave prihrankov visokih začetnih stroškov na enoto površine pri večjih razmakih namakalnih cevi.
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DOI: http://dx.doi.org/10.14720/aas.2020.116.1.1382
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