ࡱ> 5@ bjbj22 .XX4~~~~~~~EEEETEstGtGtGtGtGtGtGtGqqqqqqq$sR vr~:JtGtG:J:Jr~~tGtGrbkbkbk:J ~tG~tGqbk:Jqbkbkl~~ltGhG ԥ: gET~lTlr0slvjvlT6~~~~v~lLtGvGTbk>HDHtGtGtGrrdCELkEPrinos i kvaliteta korijena aeerne repe kao osobina sorte i posljedica gnojidbe duaikom Suzana Kristek1, Andrija Kristek1, Renata Glavaa-Toki2 1Poljoprivredni fakultet Osijek, Trg Sv. Trojstva 3, 31000 Osijek, Croatia (e-mail:skristek@pfos.hr) 2Tvornica aeera Kandit Premijer d.o.o.,Frankopanska 99, 31000 Osijek, Croatia Sa~etak Cilj istra~ivanja bio je utvrditi utjecaj poveane gnojidbe duaikom na prinos i kvalitetu korijena te prinos aeera ovisno o genotipu. U pokuse je uklju eno 16 hibrida aeerne repe (S1 - S16), od ega je 8. hibrida pripadalo Z, a 8. N-tipu. Potrebna gnojidba duaikom odreena je analizom tla iz uzoraka uzetih u proljee prije sjetve, a gnojidba je izvraena predsjetveno sa 54 kg N/ha (G0). Ostale varijante dobivene su gnojidbom u prihrani iznad izra unate koli ine i to: varijanta G1 27 kgN/ha; G2 54 kgN/ha; G3 81 kgN/ha; G4 108 kgN/ha. Najvei prosje ni prinos korijena dobiven je kod varijante G0, a iznosio je kod hibrida Z tipa 73,21 t/ha, a kod hibrida N-tipa 75,13 t/ha. Najvei prosje ni sadr~aj aeera takoer je dobiven kod varijanti G0, te je iznosio kod hibrida Z-tipa 16,57%, odnosno 16,17% (N-tip). Poveana gnojidba duaikom dovela je do porasta topivih neaeera, osobito AmN, koji je prosje no povean ve kod G1 varijante u odnosu na G0 za 26%. Najvei prosje ni prinos aeera ostvaren je uz gnojidbu G0, iako su pojedini hibridi nejednako reagirali na poveanu gnojidbu. Poveano dodavanje duaika iznad izra unatih, potrebnih koli ina (G0) dovelo je do vrlo zna ajnog pada prinosa aeera. Klju ne rije i: aeerne repa, gnojidba duaikom, hibridi, prinos, kvaliteta korijena Uvod Zna aj duaika u ishrani aeerne repe je velik. Nositelj je prinosa, ali i element koji utje e na kvalitetu korijena. Repa ga usvaja u znatnim koli inama, a optimalna koli ina se kree u uskim granicama. Kod poveane ponude aeerna repa troai duaik neracionalno, uz negativni utjecaj na proizvodni rezultat. Zbog ovih injenica gnojidba duaikom treba biti to na, s ciljem da se nadopune zalihe u tlu. Kako je duaik u tlu u organskom i neorganskom obliku, utvrditi zalihu biljkama pristupa nog duaika predstavlja problem, a zbog velike promjenjivosti u tlu problem je i termin uzimanja uzoraka. Najvee koli ine duaika (preko 85%) repa usvaja u kratko vrijeme, te je otvoreno pitanje oblika gnojiva (Westermann, 1980), utjecaja vremenskih prilika, kao i zemljianih uvjeta (Winter, 1990; Lauer, 1995; Houba et al., 1995). Faktor koji najviae pobuuje neizvjesnost pri odreivanju gnojidbe duaikom prema ranoj analizi Nmin (prije sjetve) je svakako nemogunost predvianja mobilizacije duaika iz organskih tvari tla, budui je vremenski period koji protekne izmeu optimalnog roka gnojidbe i roka vaenja aeerne repe izuzetno duga ak. To je va~no tim viae ako znamo da i prinos i kvaliteta repe zavise i od raspolo~ivosti duaika tijekom druge polovine vegetacije. Budui je u praksi gnojidba duaikom vrlo esto prevelika, ovim smo istra~ivanjem ~eljeli utvrditi utjecaj poveane gnojidbe na prinos i kvalitetu korijena koriatenjem novih genotipova aeerne repe. Materijal i metode Istra~ivanja su provedena postavljanjem poljskih pokusa 2007. godine u Topolju na eutri nom smeem tlu. Tlo prema kemijskim analizama sadr~i 2,39% humusa, pHKCl =5,22, niskog je sadr~aja fosfora (AL-P2O5=6,0 mg/100 g tla), te visokog sadr~aja kalija (AL-K2O=26,6 mg/100 g tla). Izra unata je potrebna gnojidba od 150 kg/ha P2O5 i K2O. Gnojidbom je dodano po 156 kg/ha ovih hraniva. Uzimanjem uzoraka tla u proljee iz sloja 0-30 i 30-60 cm za prinos repe od 70-80 t/ha utvrena je koli ina duaika od 54 kg/ha ato je i dodano predsjetveno upotrebom 200 kg/ha KAN-a. Dodavanjem duaika u fazi 2-4 lista (04. 05. 2007.) u koli ini 100 kg/ha KAN-a (27 kgN/ha) dobivena je varijanta G1, te 200 kg/ha KAN-a (54 kgN/ha) varijanta G2. Za varijantu G3 u prvoj prihrani je dodano 200 kg/ha KAN-a, te jo u drugoj, u fazi razvoja repe 6-8 listova (18. 05. 2007.), 100 kg/ha KAN-a (ukupno 81 kgN/ha), a za varijantu G4 u drugoj prihrani je dodano 200 kg/ha KAN-a (ukupno 108 kgN/ha). U pokuse je bilo uklju eno 16 hibrida aeerne repe (S1  S16), od ega je 8 hibrida pripadalo Z, a 8 N-tipu. Koriatene sorte vlasniatvo su oplemenjiva kih kua koje plasiraju sjeme u RH, a raairene su u proizvodnji. Pokusi su postavljeni po metodi slu ajnog bloknog rasporeda u 4 ponavljanja, a veli ina osnovne parcele u vaenju iznosila je 10 m2. Sjetva repe obavljena je 16. o~ujka, a vaenje 14. rujna. Nakon vaenja utvren je prinos korijena. U Venema laboratoriju tvornice aeera Kandit Premijer d.o.o., odreena je istoa, digestija, sadr~aj K, Na i AmN po standardnim metodama. Na osnovu tih pokazatelja prema Braunschweigerovoj formuli izra unat je prinos istog aeera po hektaru. Rezultati i rasprava Prinos korijena aeerna repe zavisio je od hibrida i gnojidbe duaikom (Tablica 1). Tablica 1. Prinos korijena aeerne repe (t/ha) zavisno od hibrida i gnojidbe duaikom. Sorta (S)Gnojidba (G) kg/ha KAN - aProsjekG0G1G2G3G4Amadea Belinda Severina Flores Buda Marcus Iris Gazeta85,60 77,60 84,87 66,86 68,67 59,07 66,70 76,3380,92 66,13 86,93 68,33 66,53 55,20 71,60 73,5376,93 60,00 83,33 68,87 48,87 53,93 64,67 72,5378,53 56,87 79,60 58,00 49,47 49,00 63,07 66,3371,80 51,82 65,73 51,60 46,44 47,93 67,07 67,4778,75 62,48 80,09 62,73 56,00 53,03 66,62 71,24Prosjek Z - tip73,2171,1566,1462,6158,7366,37Chiara Clementina Canaria Apollo Merak Prestige Libero Impact80,27 68,33 78,00 74,20 79,13 77,60 70,67 72,8775,13 58,47 64,00 75,87 58,33 72,40 75,86 68,7372,87 55,80 52,47 74,06 52,60 77,87 73,40 68,8771,33 50,60 60,00 73,47 59,93 63,27 70,13 69,8669,80 55,93 52,67 70,13 60,93 63,20 56,73 61,5373,88 57,83 61,43 73,55 62,18 70,87 69,36 68,37Prosjek N tip75,1368,8465,9964,8261,3767,23Ukupni prosjek 74,1770,0066,0763,7260,0566,80LSD0,05 LSD0,01Ukupno 6,77 12,59Gnojidba 4,19 7,81 Sorta 3,93 7,32Ostvareni prosje ni prinos korijena iznosio je 66,80 t/ha. Sorte N tipa ostvarile su samo neznatno vei prinos korijena, jer je vaenje bilo relativno rano (14. rujan), a u ljetnom razdoblju bilje~imo zastoj u porastu repe zbog visokih temperatura i nedovoljnih koli ina oborina. Ukupno za sve hibride najvei prinos korijena ostvaren je u varijanti G0. Gnojidba G1 dala je neato ni~i prinos od G0, ali razlika nije statisti ki opravdana. Daljnje poveanje gnojidbe duaikom dovelo je do statisti ki vrlo zna ajnog pada prinosa korijena. Najvei prinos ostvario je hibrid Severina uz gnojidbu G1 (86,93 t/ha), ali i uz gnojidbu G0 i G2 prinos nije zna ajno manji. Sadr~aj aeera u prosjeku pokusa iznosio je 16,04% s tim ato je viai kod Z-tipova u odnosu na N-tipove. Najvei sadr~aj aeera utvren je kod hibrida Marcus uz gnojidbu G0 (17,53%), ali kod ovog hibrida statisti ki na istoj razini je i rezultat ostvaren uz gnojidbu G1 i G2. U prosjeku svih sorata najviai sadr~aj aeera dobiven je kod gnojidbe G0. Poveanjem gnojidbe dolazi do smanjenja sadr~aja aeera, ali je pad statisti ki zna ajan tek kod gnojidbe G2, a vrlo zna ajan kod gnojidbe G3. 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KYF#$a$kd$$Ifl4\ $t   t044 laf4 $$Ifa$ $$Ifa$,9=(q*q,qqqqrr######^ $$Ifa$ $x$Ifa$$a$ . Sadr~aj aeera u melasi u prosjeku pokusa iznosio je 2,06% s tim ato je kod G0 svega 1,89%, a ve kod G1-2,04%, G2-2,05%, G3-2,10, a uz G4-2,12%. Tablica 2. Sadr~aj aeera (%) zavisno od hibrida i gnojidbe duaikom. Sorta (S)Gnojidba (G) kg/ha KAN - aProsjekG0G1G2G3G4Amadea Belinda Severina Flores Buda Marcus Iris Gazeta 15,17 16,60 16,27 16,97 16,89 17,53 16,15 16,9715,30 16,09 16,18 16,85 17,28 17,49 15,93 16,8015,63 15,78 16,15 16,89 16,58 17,32 15,84 16,5915,15 15,65 16,01 16,57 16,88 16,91 15,85 16,3115,09 15,43 15,96 16,41 16,36 17,17 15,66 15,9215,27 15,91 16,11 16,74 16,80 17,28 15,89 16,52Prosjek Z - tip16,5716,4916,3516,1716,0016,32Chiara Clementina Canaria Apollo Merak Prestige Libero Impact15,42 15,37 15,79 15,62 17,43 16,78 16,13 16,8015,16 14,86 15,60 14,56 17,10 16,26 16,27 16,1514,51 14,88 15,53 14,65 17,53 16,11 16,25 16,4615,22 14,97 15,81 14,25 16,67 16,51 15,73 15,8615,15 14,95 15,21 14,57 16,53 15,97 15,54 15,7315,09 15,01 15,59 14,73 17,05 16,33 15,98 16,20Prosjek N  tip16,1715,7515,7415,6315,4615,75Ukupni prosjek 16,3516,1216,0515,9015,7316,04LSD0,05 LSD0,01Ukupno 0,65 1,21Gnojidba 0,23 0,43 Sorta 0,44 0,80Prinos istog aeera iznosio je u prosjeku pokusa 9,31 t/ha (Tablica 3). Najviai prinos od 10,71 t/ha ostvaren je uz gnojidbu G0, a najmanji uz gnojidbu G4. Ve poveanje gnojidbe za 27 kg N/ha uzrokovalo je visoko signifikantno smanjenje prinosa istog aeera. Svako daljnje poveanje gnojidbe duaikom dovelo je do vrlo zna ajnog pada prinosa aeera. Najvei prinos aeera (12,37 t/ha) postignut je sa hibridom Merak uz gnojidbu G0, a zatim slijedi Severina 12,28 t/ha, uz gnojidbu G1. Tablica 3. Prinos istog aeera (t/ha) zavisno od hibrida i gnojidbe duaikom. Sorta (S)Gnojidba (G) kg/ha KAN - aProsjekG0G1G2G3G4Amadea Belinda Severina Flores Buda Marcus Iris Gazeta11,24 11,38 12,11 10,01 10,31 9,30 9,58 11,4710,62 9,34 12,28 10,05 10,23 8,64 9,94 10,8110,34 8,25 11,77 10,16 7,16 8,32 8,92 10,4810,19 7,79 11,02 8,37 7,35 7,35 8,66 9,419,21 6,90 9,02 7,30 6,63 7,31 9,05 9,2810,32 8,73 11,24 9,18 8,34 8,18 9,23 10,29Prosjek Z - tip10,6810,249,428,778,099,44Chiara Clementina Canaria Apollo Merak Prestige Libero Impact10,74 9,22 10,80 10,20 12,37 11,71 10,09 10,899,77 7,38 8,73 9,26 8,85 10,42 10,88 9,728,90 7,12 7,13 9,13 8,17 11,03 10,44 9,969,22 6,41 80,23 8,71 8,84 9,26 9,56 9,638,95 7,10 6,91 8,58 8,81 8,66 7,53 8,459,52 7,45 8,36 9,18 9,41 10,22 9,70 9,73Prosjek N  tip10,759,388,988,738,129,19Ukupni prosjek 10,719,819,208,758,109,31LSD0,05 LSD0,01Ukupno 0,51 0,95Gnojidba 0,22 0,41 Sorta 0,30 0,56 Zaklju ak Na osnovu provedenih gnojidbenih pokusa mo~emo zaklju iti da vrlo zna ajan utjecaj na prinos i kvalitetu korijena, te prinos istog aeera ima gnojidba duaikom i izbor hibrida. Najvei prinos korijena uz najvei sadr~aj aeera i prinos istog aeera ostvaren je uz gnojidbu duaikom prema izra unu (G0). Poveana gnojidba uzrokovala je statisti ki vrlo zna ajan pad prinosa korijena nakon poveanja od 54 kg N/ha, pad sadr~aja aeera nakon poveanja od 81 kg N/ha, te pad prinosa istog aeera ve kod poveanja od 27 kg N/ha. Najvei prosje ni prinos korijena postigli su hibridi Severina, Amadea, Chiara i Apollo. Najvei sadr~aj aeera hibridi Marcus, Merak, Buda, Flores i Gazeta, a najvei prinos istog aeera Severina. Reference Houba, V. J. G., Huijbregts, A. W. M., Wilting, P., Novozamsky, I., Gort, G. (1995): Sugar yield, nitrogen uptake by sugar beet and optimal nitrogen fertilization in relation to nitrogen soil analyses and several additional factors. Biol. Fertil. Soils, 19:55-59. Lauer, J. G. (1995): Plant density and nitrogen rate effects on sugar beet yield and quality early in harvest. Agron. Journ. 87:586-591. Westermann, D. T. (1980): Measuring soil nitrogen mineralization under field conditions. Agron. Journ. 72:1009-1012. Winter, S. R. (1990): Sugarbeet response to nitrogen as affected by seasonal irrigation. Agron. Journ. 82:984-988. Sugar beet root yield and quality as a characteristic of hybrid and result of nitrogen fertilization Abstract The aim of the research was to determine influence of increased nitrogen fertilization to the root yield and quality, and sugar yield values depending on genotype. 16 sugar beet hybrids ( S1 - S16) were included in the trials, 8 belonging to the Z-type, and 8 to the N-type. Required nitrogen fertilization for root yield of 70-80 t/ha was determined by the analysis of soil samples taken in spring before sowing, with pre-sowing fertilization of 54 kg N/ha (G0 ). The remaining variants were obtained with fertilization above calculated quantity, as follows: G1 variant  27 kgN/ha; G2 variant  54 kgN/ha; G3 variant  81 kgN/ha; G4 variant  108 kgN/ha. In G1 and G2 variants nitrogen was added once (2  4 true leaves phase) in quantities of 100 kg/ha (G1) and 200 kg/ha (G2) of KAN. Except the first fertilization that amounted 200 kg/ha of KAN, the remaining two variants got another two weeks after the first one (6  8 true leaves phase) in the quantity of 100 kg/ha (G3), or 200 kg/ha (G4) of KAN. The highest average root yield was obtained with the variant G0, and amounted 73.21 t/ha in Z-type, and 75.13 t/ha in N-type. The highest average sugar content was also obtained with the variant G0, and amounted 16.57% in Z-type, or 16.17% in N-type. Increased nitrogen fertilization caused increase in soluble sugars, particularly, AmN, which was yet averagely increased in the variant G1 by 26% relative to the variant G0. The highest average sugar yield was obtained with G0 fertilization, though certain hybrids reacted differently to the increased fertilization. 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