ࡱ> 7 3^bjbjUU *7|7|K lhJhJhJ8J,JTHr,M(TMTMTMTM/N/N/Nppppppp$r uq/N/N/N/N/Nq`TMTMr```/NR TMTMp`/Np`` b bTM M P3ɣHhJZ2 b br0Hr bu_Hu b`Climate and soil limitations for wheat and maize growing in Lika region Kovacevic V. and Buzasi Izabella Abstract Yields of field crops in Lika region are low, as affected by soil limitations and cold climate. By soil test in surface layer (0-30 cm dept) amounts of plant available P (AL-method) mainly below 5 mg P2O5/100 g of soil (very low levels) were found. Mean air-temperatures in the 4-month period (May-August: means 1981-1990) in Gospic and Osijek were 16.3 oC and19.6 oC, respectively. For this reason, growing of short maturity group of maize hybrids (FAO 100 and 200) could be recommended in Lika region. The field experiment with three corn hybrids and four rates of ameliorative P fertilization (monoammonium phosphate) was conducted in spring 2001. Grain yields were increased for 30% and they were as follows: 6.87, 7.89, 7.81, 8.96 and 9.02 t/ha, for the control, 500, 1000, 1500 and 2000 kg P2O5/ha. Mean yields of individual hybrids were as follows: 7.65 (Alpos), 8.02(OsSK247) and 8.65 (OsSK332) t/ha. Key words: Maize, Phosphorus, Fertilization, Lika region, Grain yields, Wheat Introduction Grain yields of field crops in the mountain Lika region are considerably lower than in lowland area of Croatia, mainly as affected by soil and climatic limitations. For example, mean grain yields in Lika-Senj (LSC) and Croatia (state mean) were as follows (3-year means: 2001-2003): wheat 2.41 and 3.74 t/ha, maize 1.872 and 5.15 t/ha, respectively. By arable lands is covered 56184 ha (9.5 % territory of the county) and it is 3.8% of total arable lands in Croatia. Shortage of plant available phosphorus (P) has been found in some arable lands of Lika region. Depopulation is the long-term problem of LSC region and mainly in the other parts of the mountain region of Croatia. For example, shares of this area in total population of the country were 5.0% (109281 inhabitants), 3.8% (132124 inhabitants), 2.6% (100535 inhabitants), 1.6% (74804 inhabitants), 1.8% (85135 inhabitants) and 1.2% (53677 inhabitants), according the censuses 1857, 1910, 1953, 1981, 1991 and 2001, respectively (Bertic 1993, Statistical Yearbook 2003). Low degree of soil fertility could be also contributed to depopulation trend.  Prof. dr. Vlado Kovacevic, scientific adviser, University J. J. Strossmayer, Faculty of Agriculture Trg Sv. Trojstva 3, 31000 Osijek, Croatia, e-mail:  HYPERLINK "mailto:vladok@suncokret.pfos.hr" vladok@suncokret.pfos.hr; Izabella Buzasi, dipl. ing agr., professional adviser, Croatian Agric. Extension Institute Zagreb, Lika-Senj County Dep. 53260 Brinje, Croatia, e--mail:  HYPERLINK "mailto:Izabella.Buzasi@hzpsss.hr" Izabella.Buzasi@hzpss.hr Material and methods General information about Lika region Lika region is southern part of the mountain region of Croatia. According territorial division until end of 1992 it covered five municipalities (Donji Lapac, Gospic, Gracac, T. Korenica and Otocac: official names = The community of Gospic municipalities until end of 1987 and The community of Lika municipalities until 1990) of total area 5563 km2 or 9.8% of state territory (population 90336 or 1.96% of state population according the census 1991). Since 1992 this region has been majority integrated in the Lika-Senj County (LSC: total area 5350 km2). Climate and soil characteristics in the Lika region In the Lika region, the climate is typically mountainous, with very high precipitation values (Table 3). A characteristic feature is the comparatively short growing period, that is the occurrence of late spring and early autumn frosts. Plant production in the mountain region is forage based and the narrow crop selection is dominated by maize, (early maturing group of hybrids), and then potato, rye and vegetables. There are very favourable conditions for potato, particularly seed potato, growing since there are no attacks of potato diseases. Haplic acrisol and chromic cambisol are main soil types in this region. Haplic Acrisol are deep to very deep soils of loamy texture, comparatively stable structure, with a high water holding capacity and good draining. Chemical properties are considerably less favourable, firstly the high active and potential acidity, occurrence of free phytotoxic Al+++ ions, low cation exchange capacity, lack of bases, raw humus and a low content of available nutrients, notably phosphorus. Chromic cambisols have very good physical properties owing to the stable structure affected by irreversible coagulation of ferric hydroxides that act as cementing agents in the formation of structure micro aggregates. Chemical properties are also relatively favourable - the soil reaction is acid to neutral, there is enough humus in the shallow surface horizon and a special feature is the very low phosphorus content (Skoric et al. 1985; Kovacevic and Basic, 1997). Sources of wheat and maize production and weather data The editions of State Bureau for Statistics (Statistical Yearbooks) were used as sources of yield data for the Lika region and the region of the eastern Croatia (official name: The community of Osijek municipalities). Meteorological data (precipitation mean-air-temperatures) in the regional centers (Gospic and Osijek) were used for descriptions of the weather characteristics of these regions. Response maize to phosphorus fertilization in the Lika region Choice of experimental plot (Brinje 1) was made based on previous soil test (Table 4). The field experiment with increased rates of P fertilization was conducted at beginning of May 2001. Four rates of ameliorative P fertilization were applied in form of monoammonium phosphate (MAP: 12% N + 52% P2O5) as follows (kg P2O5/ha): a) control, b) a + 500, c) a + 1000, d) a + 1500 and f) a + 2000. The standard fertilization included NPK 10:30:20 (416 kg/ha) and urea (46% N) 200 kg/ha (total kg/ha: 134 N + 125 P2O5 + 83 K2O). The field experiment was conducted in four replicates (experimental plot of fertilization = 64.26 m2) by three maize hybrids (early maturity groups of hybrids, creation of Osijek Agricultural Institute: Alpos, OsSK247 and OsSK332: experimental plot of hybrid = 28.6 m2). Maize was sown in term May 16 and harvested in October 5, 2001. Results and discussion Wheat and maize yields in the Lika region are low mainly as affected by ecological constrains. For example, in the period 1981-1990 wheat and maize yields in the Lika region were about 60% lower in comparison with yields of these crops in the eastern Croatia (Table 1). The eastern Croatia characterized intensive field crops growing with maize and wheat as main crops. Main soil types in the eastern Croatia are chernozem calcaric, cambisol eutric, regosol calcaric, gleysols (calcaric, eutric and mollic), fluvisol calcaric, luvisol albic, stagnosols haplic. In general, soil of this region is mainly more suitable for the field crops growing in comparison with soils of the Lika region (Janekovic 1971; Skoric et al. 1985, Kovacevic and Basic, 1997). Table 1. Characteristics of wheat and maize production in the Eastern Croatia and Lika region for the 1981-1990 periods (the data of State Bureau for Statistics) Tabela 1. Karakteristike proizvodnje paenice i kukuruza u isto noj Hrvatskoj i Lici za period 1981-1990 (podaci Dr~avnog zavoda za statistiku) The harvested areas (ha) and grain yields (t /ha)YearWheatMaizeEastern Croatia*Lika region**Eastern Croatia*Lika region**hat/hahat/hahat/hahat/ha1981 1982 1983 1984 1985122538 146980 145549 143874 1240654.03 4.49 5.27 5.58 5.322440 2495 2683 2796 27162.01 2.03 2.09 2.20 2.44214 301 201 268 209 305 206 779 221 3955.72 6.40 6.40 7.08 6.262335 2366 2218 2164 22161.79 2.14 2.10 2.23 1.84Mean1366014.9426262.152106106.3722602.021986 1987 1988 1989 1990124395 146235 148954 146266 1489085.16 5.22 5.85 5.15 6.502803 2837 2937 3040 30341.89 2.12 2.34 2.43 2.81217 788 197 149 209 768 208 312 234 1486.59 5.33 4.78 5.46 4.312159 2131 2076 1906 19892.15 2.20 1.45 1.92 2.31Mean1429525.5829302.322134335.2920522.0010-y. m.1397785.2627782.232120225.8321562.01Area (km2) 110905563 * 14 municipalities as follows: Beli Manastir, Donji Miholjac, Nasice, Nova Gradiska, Orahovica, Osijek, Podr. Slatina, Slav. Pozega, Sl. Brod, Valpovo, Vukovar and Zupanja. ** Five municipalities as follows: D. Lapac, Gospic, Gracac, T. Korenica and Otocac. By comparison of weather data for Osijek and Gospic, at the same period of maize growing season (May-August), heat supplies in Osijek is more favorable. Precipitation supplies (Table 3) in Lika region is mainly adequate for maize growing (long-term mean of precipitation in Gospic for the period May-August: 373 mm), while in the eastern Croatia is more frequently weather deficit (Osijek: 247 mm or for one third lower in comparison with Gospic). As maize has considerable heat demand (Shaw 1988), in climate of the Lika region (long-term mean air-temperature in Gospic for the period May-August: 16.7oC or for even 3.1oC lower than in Osijek) is possible growing of short-maturity groups of hybrids (for example, maximal FAO 100 for grain and FAO 200 for ensilage). Table 2. Characteristics of wheat and maize production in the 1996-2003 periods (the data of State Bureau for Statistics Zagreb) Tabela 2. Karakteristike proizvodnje penice i kukuruza za period 1996-2003 (podaci Dr~avnog zavoda za statistiku Zagreb) The harvested areas (ha) and grain yields (t /ha)YearWheatMaizeEastern Croatia*Lika-Senj CountyEastern Croatia*Lika-Senj Countyhat/hahat/hahat/hahat/ha1996 1997 1998 1999 200099473 107613 136652 98690 1446804.21 4.57 4.80 3.62 5.001411 1441 1545 1763 18412.63 2.60 2.59 2.71 2.47154 202 159 770 169 935 177 353 180 1826.30 7.01 6.20 6.50 4.31467 508 498 569 4722.39 2.21 2.00 2.44 1.54Mean1174214.5116002.60168 2886.065032.122001 2002 2003145365 141835 1277474.70 4.73 3.301984 2085 21042.55 2.67 2.01190 136 185 651 184 2706.63 7.21 4.49524 474 4441.69 2.64 1.29Area (km2) 12466 5350Population (status 2001) Population density per km2891259 71.553677 10.0Agricultural land (ha): status 2003734536268126Arable land and gardens (ha): status 200362087056184* five counties as follows: Vukovar-Syrmium, Osijek-Baranya, Brod-Posavina, Pozega-Slavonia and Virovitica-Podravina County. In general, all soil samples are very poor in plant available phosphorus (Table 4) because amounts above 10 mg P2O5/100 g of soil are normal levels (AL-method). For this reason, application of P fertilizers could be considerable factor of yield increases. In our experiment with increased P fertilization, corn grain yields were increased for 30% compared to the control and they were as follows: 6.87, 7.89, 7.81, 8.96 and 9.02 t/ha, for the control, 500, 100, 1500 and 2000 kg P2O5/ha. Depending on the hybrids, grain yields were as follows: 7.65, 8.02 and 8.65 t/ha, for Alpos, OsSK247 and OsSK332, respectively (Table 5). Grain moisture at term of harvest was 29.4% (Alpos), 40.0% (OsSK247) and 38.6% (OsSK332). Under cold climate at Lika region, Alpos should be recommending for matured grain, while OsSK247 and OsSK332 as ensilage maize. Phosphorus deficiency is found also in the northern Bosnia (Kovacevic and Vukadinovic, 1992). By comparison of normal and chlorotic corn plants at 6-8 leaves stage (the first decade of June 1986: near Nova Topola) they were found properties as follows: 18.84 and 2.78 mg of dry matter/plant, 0.46 and 0.29 % P, 470 and 3818 mg Al/kg, 410 and 2925 mg Fe/kg, for normal and chlorotic plants, respectively. Chlorotic plants were grown in the places of more acid soil reaction (pH in KCl: 4.84 and 4.07, respectively), while levels of P (AL-method) were similar (about 8.0 mg P2O5/100 g of soil). Okiljevic (1982) tested response of wheat and barley cultivars on this soil and found considerable role of inheritance in degree of tolerance to soil stress. Komljenovic et al. (2005) applied four rates of P fertilization up to 1500 kg P2O5/ha in spring of 2004 in Potkozarje area (Republic of Srpska, Bosnia and Hercegovina). As affected by applied fertilization maize grain yields increased up to 32% in comparison to the control. Table 3. Weather data for the regional centers Gospic and Osijek Tabela 3. Meteoroloaki podaci za regionalne centre Gospi i Osijek Gospic and Osijek: May (V), June (VI), July (VII) and August (VIII)YearPrecipitation (mm)Mean air-temperatures (oC)(y)VVIVIIVIIISumVVIVIIVIIIMeanGospic (Lika region: 44o 33N 15o23E; latitude 564 m )1981 1982 1983 1984 1985117 98 114 240 117202 58 44 131 8053 62 14 16 582 77 81 116 63454 295 253 503 26512.9 13.8 13.9 11.3 14.016.4 17.7 15.5 14.4 15.217.4 19.1 20.6 17.4 19.316.8 17.4 18.0 16.1 18.515.9 17.0 17.1 14.8 16.85-y (a)137103308435413.215.818.817.416.31986 1987 1988 1989 199053 155 82 94 176175 77 109 130 17680 51 5 91 24888 56 120 157 162396 339 316 472 76215.7 11.6 13.5 12.1 13.314.8 16.2 15.7 14.5 16.617.3 19.9 20.4 18.3 17.919.1 17.8 18.8 17.3 17.516.7 16.4 17.1 15.6 16.35-y (b)1121339511745713.215.618.818.116.41996 1997 1998 1999 2000151 100 127 133 8976 115 56 72 3332 106 30 50 89128 95 21 39 4387 416 234 294 21514.4 13.9 12.8 14.1 15.017.0 17.8 17.9 17.4 18.617.6 17.9 20.3 18.8 18.517.8 17.1 20.1 19.2 20.316.8 16.7 17.8 17.4 18.15-y (c)12070615830914.017.718.618.917.3x (a-c)123309628737313.516.418.718.116.72001 2002 200373 101 4082 85 4417 111 25291 158 8463 455 11715.3 15.0 16.316.5 18.5 21.519.9 19.2 21.220.8 18.1 22.918.1 17.7 20.63-y (d)72705115215.518.920.120.7Osijek (Eastern Croatia: 45o 32N 18o 44E; latitude 90 m)5-y (a)4991445724117.019.021.120.519.45-y (b)7883314824016.819.222.020.919.7 5-y (c)5660865926117.521.221.221.720.4x (a-c)6278555624717.219.821.421.019.83-y (d)71107664228619.121.122.022.421.2 Table 4. Chemical properties of some soils of Lika region (the surface 0-30 cm layer) Tabela 4. Hemijska svojstva zemljiata nekoliko parcela na podru ju Like ( sloj 0-30 cm) SoilpH%mg/100 g (AL-method)sample(s)H2OKClHumusNP2O5K2OBrinje 1 (field trial)6.45.33.80.20.711.4Brinje 2-56.1-7.25.1-6.53.5-4.30.20.3-1.89.4-14.0Holjevac Hobari Kompolje6.5 5.7 7.85.3 4.5 7.04.1 3.5 3.60.2 0.2 0.20.1 1.2 1.27.4 17.0 10.2 Table 5. Response of maize to ameliorative fertilization with phosphorus at Brinje experiment (Kovacevic et al. 2002) Tabela 5. Reakcija kukuruza na meliorativno ubrenje fosforom na ogledu kod Brinja (Kovacevic et al. 2002) Maize hybridFertilization (kg P2O5/ha) in spring 2001 (factor A)Mean B(factor B)125625112516252125Grain yield* (t/ha) for the 2001 growing season Alpos OsSK247 OsSK3326.36 6.94 7.327.14 7.52 9.006.69 7.91 8.819.64 8.10 9.138.43 9.64 9.007.65 8.02 8.65Mean A6.877.897.818.969.02LSD 5% LSD 1%A: 0.93 B: 0.33 AB: 1.11 1.30 0.45 1.54Index100115114130131Grain moisture at harvesting (%)Alpos OsSK247 OsSK33230.7 41.3 39.530.2 39.3 38.829.2 38.9 38.827.6 39.5 37.829.2 40.8 39.929.4 40.0 38.6Mean37.136.135.035.036.6Plant density realization (PDR) in percent of TPD* (100% = 71429)PDR89.388.989.788.788.088.9Female-sterile plants (FSP) contribution (% of total)FSP3.93.74.94.84.64.4* yield calculation on 14% grain moisture and 90% theoretical plant density (TPD): 100% = 71429 plants/ha 90% TPD = 64286 plants/ha References Bertic I. (1987): Veliki geografski atlas Jugoslavije. Sveu iliana naklada Liber Zagreb. Bertic I. (1993): Zemljopisni atlas Republike Hrvatske. Skolska knjiga i Leksikografski zavod Miroslav Krleza, Zagreb, p. 101. Janekovic Gj. (1971): Pedologic characteristics of Slavonia and Baranya (in Croatian). Zbornik radova Prvog znanstvenog sabora Slavonije i Baranje, 17-19. svibanj 1970, Osijek, p.115-176. Komljenovi I., Markovi M., Kova evi V., Veskovi M. and ustovi H. (2005): Response of maize to phosphorus fertilization in the Potkozarje area. In: Proceedings of the XL Croatian Symposium on Agriculture with International Participation (Kovacevic V. and Jovanovac Sonja Eds.), 15-18 February 2005, Opatija, Croatia, p. 449-450. Kovacevic V. and Basic F. (1997): The soil potassium resources and the efficiency of potassium fertilizers in Croatia (Country Report 10), International Potash Institute Basel. Kovacevic V., Vukadinovic V. , 1992. Phosphorus deficiency in maize (Zea mays L.) plants used for seed production. In: Phosphorus, Life and Environment from Research to Application. Word Phosphate Institute (IMPHOS) Casablanca, Maroc. p.688-690. Kovacevic V., Vukadinovic V. , Bertic B., 1997. Response of maize to soil stress and fertilization on strong K-fixing soil. In: Developments in Plant and Soil Sciences. Vol. 78: Plant Nutrition for Sustainable Food Production and Environment (Ed. by Ando T.. Fujita K.. Mae T.. Matsumoto H.. Mori S. and Sekiya J.). Proc. of the XIII Intern. Plant Nutrition Colloquium. 13-19 Sept. 1997. Tokyo. Kluwer Acad. Publ.. Printed in Japan. p.315-316. Okiljevic V. 1982. Toksicno dejstvo aluminija na neke sorte psenice i jecma na tipu tla pseudogleju Bosanske Krajine (Toxical effects of aluminium on some wheat and barley cultivars on pseudoglay soil of Bosanska Krajina region). Zemljiste i biljka 31 (1), Belgrade, p.45-54. Shaw R. H. (1988): Climatic requirement. In: Corn and corn improvement, Agronomy Monograph No 18, ASA-CSSA-SSSA, Madison, Wisconsin, USA, p. 609-638. Skori A. (1977): Tla Slavonije i Baranje. U  Tla Slavonije i Baranje (`kori A. urednik), Projektni savjet pedoloake karte SR Hrvatske, Posebna izdanja, Knjiga 1. Zagreb. str. 7-58. Skoric A., Filipovski G. and Ciric M. (1985): Klasifikacija zemljiata Jugoslavije, knjiga 13 (Classification of the soils in Yugoslavia, the book 13), Sarajevo. Ograni enja klime i zemljiata za proizvodnju paenice i kukuruza u Lici Kovacevic V. i Buzasi Izabella Rezime Prinosi ratarskih kultura u Lici su niski usled hladnije klime i svojstava zemljiata. Analizama povrainskog sloja zemljiata (0-30 cm dubine) ustanovljene su koli ine biljkama pristupa nog fosfora (AL-metoda) ispod 5 mg P2O5/100 g (vrlo niski nivo). Srednje temperature vazduha u periodu maj-avgust (proseci 1981-1990) u Gospiu (centar li ke regije) i Osijeku (centar isto ne Hrvatske) iznosile su 16.3 oC i 19.6 oC. To je razlog da se na podru ju Like mogu gajiti hibridi kukuruza FAO grupa 100 i 200, a na airem podru ju Osijeka do FAO grupe 600, eventualno FAO 700. Poljski ogled s tri hibrida kukuruza i etiri nivoa meliorativnog ubrenja (monoamonijum fosfat) postavljen je u prolee 2001 nedaleko Brinja u Lici. Prinosi zrna kukuruza poveani su do 30% usled ubrenja fosforom: 6.87 (standardno ubrenje), 7.89 (500 kg P2O5/ha), 7.81 (1000 kg P2O5/ha), 8.96 t/ha (1500 kg P2O5/ha) i 9.02 t/ha ( 2000 kg P2O5/ha). Prosje an prinos zrna pojedinih hibrida iznosio je 7.65 (Alpos), 8.02 (OsSK247) i 8.65 (OsSK332) t/ha. 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