ࡱ> \^YZ[q` bjbjqPqP 4::zBr82$V">(ffffAAAMOOOOOO$h@simAAmmsffmZ ffMmMf2 к5ǩb40"6)f66AӛAAAssvAAA"mmmmfl(l INFLUENCES OF GENOTYPE AND POTASSIUM FERTILIZATION ON NUTRITIONAL STATUS OF MAIZE ON K-FIXING SOIL V. Kovacevic1, M. Rastija1, D. Rastija1, D. Simic2 Abstract: Five hybrids were grown on Gundinci gleysol for four growing seasons (2001-1004). Two ameliorative rates of K as KCl were applied (500 and 1250 kg K2O/ha) on standard fertilization. The ear-leaf of maize was taken at beginning of silking of the second year of testing from the control and 1400 kg K2O ha-1 treatments. n general, heredity was more influencing factor of maize nutritional status (the ear-leaf composition) compared to KCl fertilization. ery high influences of genotype (in the brackets: % higher value of the highest compared to the lowest concentration: means in level of the hybrid) were found for chromium (93%), barium (35%), copper and strontium (30%). Considerable lower differences among the hybrids were found for phosphorus and sulphur (10%), boron and calcium (15%) and zinc (18%), while for remaining elements they were between 22% and 24% ( K, Mg, Fe, Na, Mn and Al). The highest rate of KCl resulted in significant increases of maize yield of 14%, 24% and 12%, for 2001, 2002 and 2003, respectively; while in the fourth year similar yields were found. The OsSK552 and Bc5982 hybrids (mean 8.70 t/ha) were more susceptible to soil stress in comparison with OsSK444 and OsSK458 (9.7 t/ha). Key words: potassium fertilization, maize hybrids, K-fixing soil, ear-leaf composition, yield INTRODUCTION Low potassium (K) supplies and oversupplies of available magnesium (Mg) have been found in some hydromorphic soils of the Eastern Croatia situating in area of Zupanja and Slav. Brod part of the Sava valley area. A tendency of maize to stalk lodging at maturity, especially during moist weather in the autumn, as well as typical symptoms of K deficiency (edge necrosis of leaves and growth retardation) could be found in this area. Based on our earlier investigations, by adequate K fertilization (2( (10( and by choice of more tolerant hybrids (9( is possible to overcome problem of unbalanced K supplies. Similar nutritional problems were found on calcareous chernozem in Hungary (7(. In this study, influences of hybrids and fertilization with potassium chloride (KCl) on nutritional status of maize (leaf composition) were tested, while yields were elaborated in the previous study (9(. MATERIALS AND METHODS The field experiment Five maize (Zea mays L.) hybrids (OsSK444, OsSK458, OsSK552, Bc5982 and Florencia) were grown on Gundinci gleysol (Brod-Posavina County) for four growing seasons (2001-1004). Two ameliorative rates of K as KCl were applied (500 and 1250 kg K2O/ha) on standard fertilization (kg/ha: 170 N + 100 P2O5 + 150 K2O) at the beginning of April 2001. Standard fertilization in level of control were applied for the complete experimental plot in the next three years of testing. The field trial was carried out by split-plot method in four replicates. Experimental plots measured 165 m2 and 33 m2, for fertilization and hybrid, respectively. The yield and stalk lodging data were shown in the previous study (9(. Sampling and sample chemical and statistical analysis The ear-leaf of maize was taken at beginning of silking of the second year of testing (July 24, 2002) from the control and 1400 kg K2O ha-1 treatments (25 leaves in the mean sample). Three soil samples were taken with auger to 30 cm of depth before the field experiment conduction (end of March 2001). The total amount of the elements in the leaf samples was measured by the ICP-AES technique after their microwave digestion using concentrated HNO3+H2O2. Plant available P and K in soil was determined by AL-method (4(. Mobile fraction of the elements in soil was also determined by ICP-AES after their extraction by ammonium acetate-EDTA (pH 4.65) solution by Lakanen and Ervio method (11(. Soil reaction and organic matter were determined according ISO (5( (6(. Statistical calculations of the data were made according the model of two-factorial trial (A = fertilization, B = hybrid) according Mead et al. (13(. The soil characteristics Moderate supply of plant available K and its unbalance with available Mg are the main characteristics of the experimental plot. Mobile fraction of other nutrients is mainly adequate for plant growth. Harmful elements status is low with aspect of sustainable environment (Table 1). Similar soil characteristics, but in more degree of nutritional unbalances including strong K-fixation, were found In a circle of about 5 km distance from this plot (10((14((15(. Table 1. Chemical properties of the experimental soil Soil properties (means of three samples at end of March 2001; 0-300 mm depth)Concentrations (mg/kg) in 0-30 cm soil depthpH%AL-methodLakanen-Ervio (11( methodH2OKClHumusP2O5K2OPKCaMg6.726.152.64199.092.71281224770768Concentrations (mg/kg) in 0-30 cm soil depth Lakanen-Ervio method (11(SFeZnMnCuBaSrCdPb10.42152.61124.74810.80.118.2NaNiCoAlBMoHgSeAs18.90.741.39132<0.23<0.02<0.24<0.46<0.32 RESULTS AND DISCUSSION In general, heredity was more influencing factor of maize nutritional status (the ear-leaf composition) compared to KCl fertilization (Table 2). For example, only molybdenum status had non-significant differences among the hybrids. Very high influences of genotype (in the brackets: % higher value of the highest compared to the lowest concentration: means in level of the hybrid) were found for chromium (93%), barium (35%), copper and strontium (30%). Considerable lower differences among the hybrids were found for phosphorus and sulphur (10%), boron and calcium (15%) and zinc (18%), while for remaining elements they were between 22% and 24% ( K, Mg, Fe, Na, Mn and Al). The Florencia had the lower leaf P ( 0.31% P) compared to remaining four hybrids (mean 0.33% P). The Bc5982 had the highest leaf K (1.79% K) and it was significant higher than in OsSK444 and Florencia (mean 1.46% K). The OsSK552 and Bc5982 had the significant higher leaf Ca (mean 0.73% Ca) compared to remaining three hybrids (mean 0.65% Ca). The OsSK552 had theconsiderably higher leaf Mg (0.61% Mg) compared to the OsSK444 (0.49% Mg). The OsSK458 and OsSK552 had the higher leaf S (0.24% S) comapred to remaining three hybrids (0.22% S). OsSK444 and Florencia had the significant higher leaf Zn (mean 19.6 mg Zn kg-1) than OsSK552 (16.9 mg Zn kg-1). OsSK552 had considerably higher leaf Fe (236 mg Fe kg-1) compared to remaining four hybrids (mean 194 mg Fe kg-1). Also, OsSK552 characterized considerably higher leaf Cu (19.7 mg Cu kg-1) compared to OsSk444 and Florencia (mean 15.7 mg Cu kg-1). OsSK444 had considerably higher leaf Mn (35.2 mg Mn kg-1) compared to Bc5982 and Florencia (mean 29.2 mg Mn kg-1). Also, OsSK444 had the considerably higher leaf B and Na (6.0 mg B and 25.7 mg Na g-1) compared to remaining four hybrids (means 5.3 mg B and 21.4 mg Na kg-1). Table 2. Influences of KCl fertilization (spring 2001) and hybrid on maize nutritional status The ear-leaf composition (in dry matter) of maize at silking stage (July 24, 2002): influences of KCl fertilization in spring 2001 (factor A) and hybrid (factor B)K2OMaize hybrid (factor B)*MeanMaize hybrid (factor B)*Meankg ha-1H1H2H3H4H5AH1H2H3H4H5APhosphorus (% P)Potassium (% K)1500.340.360.350.340.310.341.181.321.281.371.131.2614000.340.310.310.320.320.321.701.991.882.221.851.93Mean B0.340.330.330.330.311.441.661.581.791.49LSD 5%A: 0.010B: 0.016AB: 0.023A:0.07B: 0.10AB: 0.15LSD 1% 0.014 n.s. n.s. 0.09 0.14 0.20Calcium (% Ca) Magnesium (% Mg)1500.670.700.760.810.690.720.590.640.740.710.690.6714000.610.630.680.670.640.640.390.430.480.430.430.43Mean B0.640.660.720.740.660.490.530.610.570.56LSD 5%A: 0.02B: 0.03AB: 0.04A: 0.03B: 0.05AB: n.s.LSD 1% 0.03 0.04 n.s. 0.05 0.07Sulphur (% S) Zinc (mg Zn kg-1)Mean B0.220.240.240.220.2220.018.616.918.019.2LSD 5%A: n.s.B: 0.01AB: n.s.A: n.s.B: 1.8AB: n.s.LSD 1% 0.02  n.s.Iron (mg Fe kg-1)Copper (mg Cu kg-1)Mean B19719023619819116.318.519.718.715.1LSD 5%A: n.s.B: 32AB: n.s.A: n.s.B: 1.6AB: n.s.LSD 1% n.s. 2.1Manganese (mg Mn kg-1)Boron (mg B kg-1)15036.937.536.731.530.834.75.85.44.95.05.15.2140033.628.631.126.328.229.66.15.15.45.66.15.7Mean B35.233.133.928.929.56.05.25.25.35.6LSD 5%A: 1.6B: 2.5AB: n.s.A: 0.3B: 0.4AB: n.s.LSD 1% 2.2 3.5 0.4 0.6Molybdenum (mg Mo kg-1)Sodium ( mg Na kg-1)Mean B0.920.850.,850.860.9425.720.521.820.922.3LSD 5%A: n.s.B: n.s.AB: n.s.A: n.s.B: 3.0AB: n.s.Barium (mg Ba kg-1)Chromium (mg Cr kg-1)1502.552.662.772.812.172.590.500.350.810.320.320.4614001.862.252.472.551.802.190.300.270.280.310.240.28Mean B2.212.462.622.681.990.400.310.540.320.28LSD 5%A: 0.23B: 0.37AB: n.s.A: 0.04B: 0.06AB: 0.09LSD 1% 0.32 0.51 0.06 0.09 0.13Aluminium (mg Al kg-1)Strontium (mg Sr kg-1)150145871239511111218.518.720.419.516.218.7140010912313113211812215.316.017.316.013.115.5Mean B12710512711311516.917.318.917.814.7LSD 5%A: n.s.B: 21AB: 29A: 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j[hD&hD&OJQJ^JhD&hD&OJQJ^JhD&hxOJQJ^JF#GHRIJTJJJ@KsKNB\ ^ ` b d f      $a$gdu^p$a$gdU$a$gdx J JTJUJWJXJYJZJJJJJJJJJJJsKtKvKwKxKLóqó`ó^QQóhD&hxOJQJ^JU hD&hxOJQJ^JmH sH hD&hu^pOJQJ^JaJhD&OJQJ^JmHsH hD&hu^pOJQJ^JmHsHhD&OJQJ^JhOJQJ^J j]hD&hD&OJQJ^Jhf>OJQJ^J j[hD&hD&OJQJ^J$hD&hxOJQJ^JaJmH sH hD&OJQJ^JaJmH sH Richter D., Kova evi V., Flossmann R. (1990): Ergebnisse and Untersuchung von K-fixierenden Boden Jugoslawiens. In: Richtig dungen - mehr ernten, Kali-Bergbau Handelsgesellschaft mbH Berlin, 14 (2) 1-6. (15(. Vukadinovi V., Berti Blazenka, Kova evi V. (1988): Kalium- und Phosphorverfugbarkeit auf den Boden im Gebiet von Posavina. Tag. Bericht Akad. Landwirtsch. Wiss. DDR, Berlin. No 267, p. 73-80. ABOUT THE AUTHORS 1Prof. Dr. Vlado Kovacevic, Assist. Prof. Mirta Rastija, Assist. Prof. Domagoj Rastija, University J. J. Strossmayer in Osijek, Faculty of Agriculture, Trg Sv. Trojstva 3, HR-31000 Osijek, Croatia; E-mail:  HYPERLINK "mailto:vladok@pfos.hr" vladok@pfos.hr 2Dr Domagoj Simic, Agricultural Institute in Osijek, Juzno predgradje 17, HR-31000 Osijek, Croatia; E-mail:  HYPERLINK "mailto:domagoj.simic@poljinos.hr" domagoj.simic@poljinos.hr     Research People and Actual Tasks on Multidisciplinary Sciences 6  8 June 2007, Lozenec, Bulgaria ,t\ ^ f       @ B  , . t v x   ȶ}kSk@k$ho!hxf(0JOJQJ^JmHsH/jho!hxf(OJQJU^JmHsH#jhxf(OJQJU^JmHsHhd;<OJQJ^JmHsHh`(OJQJ^JmHsHhxf(H*OJQJ^JmHsHhxf(OJQJ^JmHsH#hxf(hxf(5OJQJ^JmHsHhX5OJQJ^JmHsH#hD&hZE5OJQJ^JmHsHhD&hxOJQJ^JhD&OJQJ^J   \ p r                $        Ҩ҇{{{{rerZV{hzhz5CJmH sH hz5;CJmH sH hz5;CJh jh UhUOJQJ^JmHsH$h7&h`(0JOJQJ^JmHsH/jCh7&h`(OJQJU^JmHsH#jh`(OJQJU^JmHsHh`(OJQJ^JmHsH#hxf(hxf(H*OJQJ^JmHsHhxf(OJQJ^JmHsH        " $       $  8&dP]a$gdNF$a$gd)N21h:p. 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