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Moguća opasnost od mraza?!! [31.03.2012]

JabukaŠljivaBreskvaVišnjaOstale biljne vrste

Prema vremenskoj prognozi u ponedeljak 2.aprila, odmah posle ponoći moguća je pojava mraza. Mraz se očekuje u svim regionima Srbije, a najjači u Pomoravlju (do -2C). Na peskovima i mikrodepresijama moguće su i niže temperature.

Voćne vrste se, u zavisnosti od regiona i lokaliteta nalaze u različitim fazama razvoja, pa je i njihova osetljivost na mraz različita:

Kajsija je u fazama pun cvet - precvetavanje, prva oštećenja nastaju na - 2.5C 

Breskva je u fazama zeleni pup - početak cvetanja, prva oštećenja nastaju na -6 do -2,5C

Šljiva je u fazama zelena tačka - zeleni pup, prva oštećenja nastaju na -6.5 do -4C

Višnja i trešnja su u fazama zelenog pupa, prva oštećenja nastaju na -3,5C

Jabuka je u fazama mišije uši - crveni balon, prva oštećenja nastaju na -3,5 do -2,5C

Kruška je u fazi zelenog pupa, prva oštećenja nastaju na -4,5C

Jagoda je u fazi intenzivnog formiranja lisne mase, prva oštećenja nastaju na  -5C

Pošto je predviđen mraz do -2C, potencijalno najugroženije su kajsije, breskve (koje su u cvetu) i jabuke (koje su u crvenom balonu).    

Moguće mere ublažavanja posledica mraza su:

- orošavanje (antifrost sistemi), skupo, intenzitet vlaženja 3-5 mm/m2/sat, što finija magla

- zadimljavanje slamom, starim gumama itd, relativno jeftino. Važno je da se počne pre nego što temperature padnu ispod 0C. Najbolji efekat je po mirnom vremenu. Dobro je rešenje za mrazeve do -3C.

- zaštita sa tzv. biljnim antifrizima na bazi bakterija iz roda Thiobacillus. Preparati koji mogu da se nabave kod nas, različitim kanalima su Cropaid i NPA-Thiofert. Preporučen momenat primene je nedelja 1.april (nekoliko sati pre očekivanog mraza). Pruža zaštitu 10 dana, i za mrazeve do -6C.

- primena antistres korektora (Isabion, Megafol, Delfan, Fertileader Vital 954...). Treba ih primeniti neposredno pred mraz ili u prvih 24 sata po početku mraza. Ublažavaju problem kod mrazeva do -2C.