ࡱ> "$ !bjbjVV 4<<J4T T ?$%c????FZ$$$$$$$$'w*J$FF$??q%\\\2??$\$\\:~#,$?pwA^# $%0%#R*\*$*$\$$\%*T ]:Herbicidno djelovanje nekih organskih kiselina Stanisavljevi Aleksandar1, Vukovi Marko1, Bali evi Renata1, Brme~ Mirjana1, Iatuk Sanda1, Musovi Aleksandra1 1Poljoprivredni fakultet u Osijeku, Kralja Petra Sva ia 1d, 31 000 Osijek; HYPERLINK "mailto:astanis@pfos.hr"astanis@pfos.hr Uvod U posljednjih nekoliko godina na tr~iatu su se pojavili novi herbicidi kao npr vinski ocat ili oni koji sadr~e limunov sok, limunsku kiselinu, pelargonijsku kiselinu, cimetnu kiselinu i druge biljne sastojke. Upotreba vinskog octa u suzbijanju korova je jedan od najmanje atetnih na ina suzbijanja. Njegova efikasnost varira ovisno od korova koji suzbijamo i koncentraciji octene kiseline. Ako je koncentracija octene kiseline viaa od 8% onda mora ocat biti naveden kao aktivna tvar. Neke komercijalne formulacije vinskog octa sadr~e limunov sok ili citrusovo ulje, te se dodaje i mala koli ina tekueg sapuna koji djeluje kao surfaktant (omoguava bolje mijeaanje ulja i soka). Herbicid djeluje samo na tretirani nadzemni dio korova, a ne utje e na korijen tako da neki viaegodianji korovi e se oporaviti zahvaljujui rezervnoj tvari u korijenu. Ocat na tlo djeluje tako da smanji pH tla no samo privremeno. Za 48h se pH vrati na prijaanju vrijednost. (Teasdale and Radhakrishnan, 2002). Diaz (2002) navodi da se najbolji rezultati posti~u ako se korov tretira u fazi razvoja 2-6 listova, tretirajui u razmacima od 2 tjedna, a maksimalni rezultati se posti~u kada korov ima razvijena 4 lista. Chinery i Weston (2001) zaklju ili su da svi tretmani octenom kiselinom su uzrokovali neku reakciju i to ve 6 sati nakon tretiranja, a nakon 72 sata na svim korovima je ateta bila 95  100%. Octena kiselina je djelovala na korov ve nakon 6 sati dok je herbicidu sa glifosatom bio potreban dulji period, ali se korov tretiran octenom kieselinom br~e oporavio (nakon 9 tjedana) nego onaj tretiran sa glifosatom (nakon 13 tjedana). Allievi i sur. (1996.) Zaklju ili su da herbicid i nema veliki utjecaj na mikrofloru tla u slojevima dubljim od 2 cm. Dick (2010) je istra~io utjecaj herbicida na pH tla. On je ustvrdio da ako je pH tla vei, tako raste i opasnost od oateenja usjeva. Materijal i metode Herboloaka istra~ivanja u nasadu kupine provedena su na kambi nom arenosolu (FAO 1990a), urevac, lokalitet  Veliki kostanj u vegetacijskoj godini 2010. Pokus je postavljen 16. 04. 2010. god. U pokusu je istra~ivan herbicidni u inak octene kiseline (T2-25% i T3 15% koncentracije) te kombinacija octene i limunske kiseline (T4-25%+25% i 15%+15% koncentracije. Kao okvaaiva  smo koristili tekui sapun (Likvi balsam, Saponia d.d.) pH neutralan, biorazgradljiv uz dodatak 5 grama NaCl/l. Za kontrolu (T1) je koriaten herbicidni pripravak  Boom efekt u koncentraciji 1,5 % koji predstavlja neselektivni herbicid na bazi glifosata (360 g/l), formulacije SL. Tretirali smo podru je ispod kupina u duljini 25 m, a airine oko 1 m. Tretirano podru je smo podijelili na 5 parcela, svaka duljine po 5m. Ukupno je tretirano 15 biljka (3 biljke po kombinaciji). Zakorovljenost usjeva utvrena je na osnovi broja korova, dva puta u sezoni. Prvi puta, prije primjene herbicidnih pripravaka, 16. 04. 2010. god. i drugi puta nakon primjene herbicidnih pripravaka 14. 05. 2010. god. Uzorci korovnih biljaka za botani ku analizu uzeti su s povraine od 0,25 m2 na etiri slu ajno odabrana mjesta u svakoj parceli, tj. na ukupno 16 mjesta ili ponavljanja za svaku varijantu u pokusu. U laboratoriju su korovne vrste determinirane prema odgovarajuim priru nicima (Domac, 2002, Kne~evi, 2006) te razvrstane po vrstama i izbrojani nadzemni izdanci. Broj biljaka za svaku vrstu izra~en je po m2. Za daljnju analizu, korovne vrste svrstane su u dvije korovne skupine: jednosupnice i dvosupnice. U inkovitost herbicidnih pripravaka izra unata je u odnosu na kontrolu (glifosat) i izra~ena u postotku, posebno za svaku korovnu skupinu i za ukupan broj korova po m2, prema formuli: KE(%) =  QUOTE   X 100 K  broj korova po m2 na kontroli i prije tretiranja T  broj korova po m2 nakon tretiranja Za nematoloake analize, uzorci tla sa svih 5 tretmana uzeti su sondom promjera 2 cm, na dubinu 0-30cm. Izdvajanje je obavljeno Seinhorstovom metodom (Seinhorst, 1956.)  metodom boca. Utvren je broj i popis rodova u 100 g tla. Utvrena je i brojnost nematoda iz trofi ke grupe fungivora, budui da one poveavaju brojnost s poveanjem kiselosti tla. Za analize fizikalno-kemijskih svojstava tla su, nakon zavraetka pokusa uzeti prosje ni uzorci tla po svim kombinacijama. Sadr~aj humusa odreen je bikromatnom metodom, a pH vrijednost uzoraka tla odreena je prema Lisjak i sur. (2009.). Rezultati i rasprava Iz rezultata (Tablica 1.) vidi se da tretmani organskim kiselinama u relativno visokim koncentracijama nisu uzrokovale atetno dugotrajno sni~avanje pH reakcije tla u razdoblju 28 dana od po etka primjene istih. Tablica 1. Analiza tla po zavraetku pokusa (14. 05. 2010.) TRETMANpH(H2O)pH(KCl)HUMUS (%)HKKontrola (16.04.2010.)6,214,721,853,02T16,424,941,443,94T26,184,611,314,38T36,294,811,293,41T46,364,881,363,33T56,224,961,283,76 Tretman glifosatom o ekivano nije uzrokovao nikakvu vidljivu promjenu pH. Prema Teasdale i Radhakrishnan (2002) ocat na tlo djeluje tako da trenuta no smanji pH tla, no samo privremeno. Oni u svojim istra~ivanjima navode da se pH za 48h vrati na prijaanju vrijednost. Kod tretmana glifosatom broj izdanaka jednosupnica i dvosupnica po m2 se poveao sa 157 na 209 dok se kod tretmana organskim kiselinama zna ajno smanjio tako da je pimjerice najbolji rezultat postignut na T5 gdje se broj izdanaka jednosupnica i dvosupnica smanjio za ak 57,1 % tj. sa 187 na samo 37 izdanaka po m2 (Tablica 2. i 3.). Tablica 2. Floristi ki sastav korovne zajednice u nasadu kupina (prije tretiranja) pri razli itim tretmanima i prosje an broj izdanaka korovnih vrsta po m2 povraine. VRSTE KOROVA (16.04.2010.):T1T2T3T4T5A: JEDNOSUPNICEDigitaria sanguinalis(L.) Scop.4016122416Echinochloa crus-galli(L.)PB.00244812Setaria glauca(L.)PB. 120000UKUPNO: 5216367228B: DVOSUPNICEAchilea milleforium L.00004Conyza canadensis L. (Crong)40000Draba verna L.2020805684Lamium purpureum L.2880280Stellaria media (L.) Vill.168242820Taraxum officinale Web.1248288Valerianella locusta(L.)Laterrade2159254431Veronica persica Poir. 400012Vicia sativa L.000120Viola arvensis Murray00040UKUPNO:10599137200159A+B (JEDNOSUPNICE+DVOSUPNICE)157115173272187 Tablica 3. Floristi ki sastav korovne zajednice u nasadu kupina (poslije tretiranja) pri razli itim tretmanima i prosje an broj izdanaka korovnih vrsta po m2 povraine. VRSTE KOROVA (14.05.2010.):T1T2T3T4T5A: JEDNOSUPNICEDigitaria sanguinalis(L.) Scop.8412482012Echinochloa crus-galli(L.)PB.7600124Setaria glauca(L.)PB. 00040UKUPNO: 16012483616KE % *92,570,077,590,0B: DVOSUPNICECapsella bursa-pastoris (L.) Med.40003Erigeron annuus (L.) Pers.210080Galium mollugo L.1501700Geranium dissectum (L.) 04000Stellaria media (L.) Vill.00400Taraxacum officinale Web.66888Valerianella locusta (L.) 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U provedenim ispitivanjima utjecaja primjene ekoloaki prihvatljivih pripravaka na zajednicu korova u kupinama uo eno je kako je najvea brojnost nematoda iz grupe fungivora bila upravo kod tretmana kod kojega je primjenjena najvea koli ina octene (25%) i limunske kiseline (25%) tj. tretmanu T4. Ostali ispitivani tretmani imali su znatno manji broj nematoda iz grupe fungivora (Graf 1.). Najvei broj rodova (Graf 2.) utvren je u tretmanu T4 koji je tretiran octenom i limunskom kiselinom 25 %, dok je najmanja brojnost utvrena u tretmanu T1 koji je tretiran sredstvom na bazi glifosata. Iz toga zaklju ujemo kako su ekoloaki pripravci za tretiranje korova puno neakodljiviji za organizme u tlu od kemijskih pripravaka na bazi glifosata.  Graf 1. Brojnost nematoda iz grupe fungivora   indikatori kiselosti u pojedinim tretmanima u 100 g tla-1  Graf 2. Brojnost rodova nematoda u pojedinim tretmanima u 100 g tla-1 Zaklju ci Tretman glifosatom (T1) o ekivano nije utjecao na promjenu pH tla, a pokusom je utvreno da takoer ni tretmani organskim kiselinama (T2-T5) nisu utjecali na promjenu pH tla. Na svim tretmanima (T1-T5) utvrena je 100 % u inkovitost koriaetnih preparata u periodu 10 dana od po etka tretiranja. Najbolja u inkovitost organskih kiselina na suzbijanje korova se postigla u fenofazi 4-6 razvijenih listova. Retrovegetacija iskazana kroz broj novoizraslih korovnih biljaka bila je zna ajno manja kod tretmana organskim kiselinama. Taj efekat pripisujemo dodanoj koli ini NaCl (5 g/l) u sam herbicidni pripravak. Naime, smatramo da je tako izazvani solni stress kod biljaka onemoguio potrebno usvajanje vode, unato  izrazito velikim koli inam padalina u promatranom periodu. Naju inkovitiji su se pokazali tretmani sa 25% koncentracijom octene kiseline (T2) i u kombinaciji sa limunskom kiselinom (T4, T5). Provedenim istra~ivanjem potvreno je kako su organske kiseline sa herbicidnim djelovajem prihvatljiviji u smislu utjecaja na bioraznolikost. Pripravci koriateni u istra~ivanju manje su uznemirili zajednicu nematoda u tlu tj. nisu atetno utjecali na bioraznolikost u tlu. Nematode su se pokazale kao izvrsni bioindikatori kiselosti tla. Literatura HYPERLINK "http://www.ncbi.nlm.nih.gov/pubmed?term=%22Allievi%20L%22%5BAuthor%5D"Allievi L, HYPERLINK "http://www.ncbi.nlm.nih.gov/pubmed?term=%22Gigliotti%20C%22%5BAuthor%5D"Gigliotti C, HYPERLINK "http://www.ncbi.nlm.nih.gov/pubmed?term=%22Salardi%20C%22%5BAuthor%5D"Salardi C, HYPERLINK "http://www.ncbi.nlm.nih.gov/pubmed?term=%22Valsecchi%20G%22%5BAuthor%5D"Valsecchi G, HYPERLINK "http://www.ncbi.nlm.nih.gov/pubmed?term=%22Brusa%20T%22%5BAuthor%5D"Brusa T, HYPERLINK "http://www.ncbi.nlm.nih.gov/pubmed?term=%22Ferrari%20A%22%5BAuthor%5D"Ferrari A.(1996):  Influence of the herbicide bentazon on soil microbial community ,DISTAM, Sezione Microbiologia Agraria, Alimentare, Ecologica, Universita degli Studi di Milano, Italy. Chinery D., Weston L. (2001): Vinegar Herbicide, report (project title: Evaluation of acetic acid based herbicides for use in broad-spectrum turfgrass and weed control) Diaz P. (2002): Vinegar as an Organic Weed Killer, New Food Co-op, Newsletter Dick C. (2010): How Soil pH Affects Soil-Applied Herbicides; Domac R. (2002): HYPERLINK "http://knjiga.hr/04.asp?ID=2880&param=f"Flora Hrvatske - priru nik za odreivanje bilja, HYPERLINK "http://knjiga.hr/06.asp?param=%C5%A0&ID=272"`kolska knjiga d.d.,Zagreb, str.504. FAO. (1990a): FAO-Unesco Soil map of the World: Revised Legend, World Soil Resources report 60, FAO/Unesco/ISRIC, Rome. Kne~evi M. (2006):Atlas korovne, ruderalne i travnja ke flore, poljoprivredni fakultet Osijek, str. 402. Lisjak M., `poljarevi M., Agi D., Andri L. (2009.): Praktikum iz fiziologije bilja. Poljoprivredni fakultet u Osijeku, on-line priru nik: Seinhorst, J.W. (1956): The quantitative extraction of nematode from soil. Nematologica 3. Teasdale J. R., Radhakrishnan J. (2002): Acetic acid (vinegar) for weed control revisited, Integrated Crop Management Beltsville, Maryland, at the USDAHYPERLINK "http://www.barc.usda.gov/anri/sasl/vinegar.html" Webber HYPERLINK "http://www.ars.usda.gov/pandp/people/people.htm?personid=5960"C. (2006): Vinegar as a burn-down herbicide: Acetic acid concentrations, application volumes,and adjuvants, Oklahoma Agriculture Experiment Station Departmental Publication, Summary Herbicidal activity of some organic acids In this experiment we investigate the influence of organic acids (acetic and citric acid) with herbicide effect on weed flora present in the blackberry orchard. The experiment was set up on 16. 04. 2010. at the blackberry orchard (cv. Thornfree), aged 4 years, urevac, locality "Veliki kostanj. Treatments in the experiment were as follows; control (T1) - herbicide based on glyphosate at a concentration 1.5%, treatment (T2) - acetic acid concentration of 25% treatment, (T3) - acetic acid concentration 15%, treatment (T4 ) - combination of acetic and citric acid (25%), treatment (T5) - combination of acetic and citric acid (15%). For all treatments (T1-T5) was found 100% efficiency of used preparations during 10 days from start of treatment. Regeneration of damaged plants was after 20 days is significantly higher in treatments with organic acids (T3) compared to treatment with glyphosate. Retro vegetation total number of new grown plants after 28 days was significantly lower in treatments with organic acids (T2, T4 and T5) in relation to glyphosate treatment. Glyphosate treatment (T1) had a negative impact on biodiversity, expressed through the adverse effect on the total number nematoda in soil, compared to treatments with organic acids (T2-T5). 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