ࡱ> HJEFGq`QbjbjqPqP ?::,/+^U^U^U^U^U^U^UU4#8y)('''''''$*h-^'^U> >>'^U^U(ttt>^U^U't>'tt ^U^U. JAL2 J*(0)ts-Rs-T."P&s-^Uv\t@''"R)>>>>yyyLyyyrUDU,U^U^U^U^U^U^U NITROGEN FERTILIZATION AND CROP LOAD IMPACT ON FRUIT MACROELEMENT CONTENT AND QUALITY INDICES OF APPLES GROWN ON CALCAREOUS SOIL Aleksandar STANISAVLJEVI  Meri ENGLER  Miroslav LISJAK  Ru~ica LON ARI Faculty of agriculture Osijek, University of J.J. Strossmayer, Trg Sv. Trojstva 3, 31 000 Osijek, Croatia, e-mail: astanisa@gmail.com Abstract: In two-year experiment in apple orchard on calcareous soil in eastern Croatia, N fertilization and crop load influence on fruit macroelement content and fruit quality was investigated. The effect of year was significant in all tested parameters except Ca and Mg content in fruits, with higher values observed in dryer 2003 year. The applied N fertilization and crop load did not influence any of tested parameters except fruit weight. The interaction of year and crop load had an impact on fruit Ca content and fruit weight, which was negatively related to all macroelement concentrations as well as fruit dry matter content, total acid and total sugar content in given experimental conditions. Keywords: apple, calcareous soil, crop load, fruit mineral composition, fruit quality, nitrogen fertilization Introduction As stated by Nagy et al. (2006), modern and competitive fruit growing is unimaginable without appropriate location, technology and nutrition that need to be harmonized. Fruit nutrient contents and their interactions, important for fruit quality, can be greatly influenced by abiotic environmental factors, such as soil nutrient supply and climate conditions. According to Nava et al. (2007), vegetative vigour and yield potential of the apple trees primarily depend on the initial soil fertilization, based mainly on N application. In comparison with other nutrients, N has the largest uptake and can as well significantly influence the uptake and content, mainly cations (e.g. K, Mg and Ca) in plants (Toma et al., 2007). Therefore, optimal N fertilization in particular fruit growing area needs to be established considering source-sink relations in fruit plants, determined by crop load. On acid soil, Vg et al. (2007) obtained the best yields of apples under harmonic nutrient supply, regarding Ca, Mg and B. Low uptake of K on calcareous soil was reported in sweet cherries (Nagy et al., 2007). Mg can strongly compete with Ca and K uptake and transport processes, leading to the development of apple storage disorders (Zavalloni and Marangoni, 2001). The aim of this research was to evaluate the impact of broadcast N fertilization and apple crop load on the fruit macroelements composition as well as fruit quality, based on two-years experiment settled in the orchard planted on calcareous soil. Materials and methods The field trial was conducted in apple orchard (cv. Idared, grafted on M9 rootstock) on southern side of Baranja mountain in eastern Croatia. The tree density of apples planted in 1989 was 1984 trees ha-1 in form of spindle bush. Design of the experiment was split-plot with 4 nitrogen doses (0-control, 30, 60, 90 kg N ha-1) and 3 crop load pattern (not regulated-control, 50, 100 fruit tree-1 defined by hand after June drop). All experimental combinations were settled in 4 replications with 5 trees each. Broadcast N fertilization was applied during 3 years (2001-2003), about 1 month after bloom (May) in the form of Ca(NO3)2. The applied fertilization supposed to provide faster and more secure N uptake, including N storage from previous year for subsequent bud formation, and to improve quality of remainig fruit later in season as well. Table 1. The agrochemical properties of soils and climate data for two-years experiment in apple orchard (OMC- soil organic matter content) Initial soil analysis data in the year 2001Soil depth (cm)pHAL-K2OAL-P2O5OMC %CaCO3 %NO3-N mg kg-1H2OKClmg kg-1 soil0-307.947.23210.3296.11.724.5824.0430-607.767.21109.0259.61.365.1321.31Climate condition data in vegetation period (April-September)Years200220031965-2004Total precipitation (mm)430180369Mean air temperature (oC)17.318.615.8 From each repetition, 25 randomly selected commercial fruits were used for nutrient content analyses and quality indices evaluation. After peeling, slices of fruit without seed were homogenized and used for total acids (Mitcham et al., 1996) and total sugars determination. The same fruit samples were used for dry matter and mineral content analysis. After wet ashing using a mixture of sulphuric and perchloric acid, with H2O2 additions, N was analyzed with micro-Kjeldahl procedure, P spectrophotometrycally, while K, Ca and Mg content was determined by AAS. The results were analyzed using ANOVA and F-test for the evaluation of treatments effect, as well as linear correlation analyses and t-test in the assessment of the significance of tested parameters relations. Results and discussion The highest influence on the investigated parameters had year what means that P, K, Ca content and fruit FW differed very significantly between years (Pd"0.01), however, year influence was less significant for fruit N content (Pd"0.05; Table 2). All four macroelements had higher content in fruits in 2003. On the contrary, fruit FW was lower in that year. TA and TS were also influenced by the year (Pd"0.05), showing higher values in 2003. N rate influenced only fruit FW, with heavier fruits obtained with higher N rates (Pd"0.01). We supposed that increasing N content in fruit (FW) in that year (2003) is a consequence of N accumulation from fertilization in a previous year (2002), which in the research of Nava et al. (2007) had affected the fruit buds nutrition, considering the significant increase of the fruit number and yield. In both years, the highest dose of 90 kg ha-1 of N increased the number of fruits before June drop (data not shown). Hence, remaining fruits (after adjustment of crop load) were significantly bigger than observed at other N levels applied even in the year 2003, inspite of severe drought (Table 1). As a diference from young fruit trees that have shallow root system, the old trees have their active root zone in much deeper soil level (Nmeth, 2006). Here, the sub-surface soil layer was poor in K2O (Table 1), and considering that no K was added in the applied fertilization treatments, this might explain relatively low K content in fruits (909.4 - 1171.4 mg kg-1 FW). In comparison with the results of melik et al. (2005) in young apple orchard on acid soil, K content was lower and Ca was higher in our research, what seems logical because of differences in soil nutrient content and pH. Table 2. Fruit macroelement content and quality indices in apple under influence of year, N rate and crop load (DM fruit dry matter, FW fruit fresh weight, TA total acids as malic acid, TS total sugars) YearN rate kg ha-1Crop load fruits plant-1NPKCaMgDMTATSFWmg kg-1 fruit fresh weight%g2002N0Control410.057.61020.871.246.814.26.097.38216.050510.556.6857.681.735.514.16.676.73246.2100625.698.01027.584.350.214.16.237.67216.2N30Control564.653.7787.567.139.913.46.437.26214.850687.844.71002.981.946.914.95.366.91237.8100536.668.81008.688.549.814.05.906.79217.2N60Control477.650.6874.669.045.214.56.277.31220.250404.550.1755.071.442.414.36.036.71248.6100354.927.7855.669.439.413.95.907.92221.5N90Control456.056.4820.466.741.414.06.147.08224.350572.971.7958.075.643.514.46.537.53273.8100602.950.7943.878.448.614.85.916.89230.32003N0Control738.1118.11239.586.257.115.77.768.97177.950617.0140.01151.673.644.615.56.988.72189.4100726.4116.71218.484.849.515.77.457.99179.0N30Control617.4126.41194.498.248.115.87.209.03173.950734.3114.31120.779.649.415.27.447.29190.2100655.4118.71120.793.448.315.86.838.51178.1N60Control705.6132.21159.477.242.315.67.118.30184.250731.8120.61144.280.445.015.36.938.43197.7100733.4117.11164.076.649.315.67.188.58183.1N90Control776.5115.71224.093.650.715.47.508.47185.050629.3124.61150.297.150.615.57.648.11208.3100630.9114.01170.074.346.915.27.158.03186.2Analysis of variance (F test, * Pd"0.05, ** Pd"0.01)Year*******nsns****N ratensnsnsnsnsnsnsns**Crop loadnsnsnsnsnsnsnsns**Year x N ratensnsnsnsnsnsnsnsnsYear x Crop loadnsnsns*nsnsnsns**N rate x Crop loadnsnsnsnsnsnsnsnsnsYear x N rate x Crop loadnsnsnsnsnsns*nsns Crop load applied in this investigation failed to influence fruit composition, TA and TS, but it determined fruit FW very significantly (Pd"0.01). The interaction of year and crop load was expressed in fruit Ca content (Pd"0.05) and fruit FW (Pd"0.01). TA content was the only parameter that was influenced by the interaction of all three factors. Significant correlations were established among tested parameters (Table 3) whereas only Ca and Mg content did not correlate with TA. Fruit mass was negatively related to nutrient content as well as other fruit quality indices. K was in positive relation to Ca and Mg, so that their antagonism was not observed, based on the fruit mineral content. Table 3. Coefficients of linear correlations among apple fruit mineral content and quality indices, under influence of year, N rate and crop load (DM fruit dry matter, FW fruit fresh weight, TA total acids, TS  total sugars; * Pd"0.05, ** Pd"0.01) NPKCaMgDMTATSP0.75**K0.80*0.89**Ca0.54**0.55**0.64**Mg0.59**0.51**0.70**0.59**DM0.75**0.84**0.87**0.59**0.57**TA0.67*0.82**0.75**nsns0.71**TS  4 : < R V X Z x z |  < = E M N W X Y c q t | j ~wojej`j[e hz95 h$K5 hd5 hF5hMhK5 h)hE**heqhE**0J6H*]heqhKH*hCIhNZJH* h,H* hA]|H*hCIhsH* hKH* hsH*hwhmyEHH*h i hE**h!'h!' hE**hjEhFh; hE**hE**h,hNZJhNZJ5mH sH h,5mH sH # = Y ( Wz $$Ifa$gd4$a$gdNZJ$a$gdLv $7$8$H$a$gd4$gd4$$a$gd4$gdS^xgd)gd|`0  gd( gd- $xa$gd-%P ' ( 1 2 !:M ;<ʺ~t~j~b]b]UM]hOh35hOhs55 h$K5hOh#5h$K5B*phhd5B*phhOho5B*phhOh4LZ5hOh5hOh G5hOh55hE**hW h)hE**hFhE**CJ\aJmH sH hFCJ\aJmH sH "h)hE**5CJ\aJmH sH h|`0hE**0J hhd5 hz95&5[fIegiʺʵ|s|hhLvhCJaJhdCJH*aJhdCJaJhLvh`CJaJhW h)hE**4hOhu!5B*OJQJ^JmHnHph3fsHtH hd5hOhXv5hOh5hOh`5hOhO5hOh9A5hOh);H5hOhs55 h$K5hOh35&&( D\]p-׸׸יvfWh7yhNZJCJaJmH sH h7yhNZJ6CJaJmH sH hLvh,CJaJmH sH 'hdB*CJaJmHnHphsHtH-hLvhoB*CJaJmHnHphsHtHhXrCJaJhdCJH*aJhLvhoCJaJhLvh5h CJaJhdCJaJhdCJH*aJhLvh`CJaJhLvh`CJH*aJ-Vyz ѺɯɯѯɯѯɯwѺѯɂh3hD6CJaJhD6CJH*aJh98hD6CJH*aJh9hD6CJH*aJhbhD6CJH*aJhbhD6CJaJhhD6CJaJmH sH hD6CJaJhhD6CJaJhLCJaJmH sH hD6CJaJmH sH h`CJaJmH sH .Ff\ $$Ifa$gd4mkd$$IfTl/ t0644 laT  %+FfM $$Ifa$gd4   $%*,267;<HLMQRWYoOhLvh4CJaJhA]|CJaJhD6CJH*aJh7yhD6CJaJh$KhD6CJaJmH sH h>MhD6CJaJhD6CJaJmH sH hD6CJaJhhD6CJaJ<+, kd9$$IfTlִ 5/%$ t06    44 laT,27<BHMRX $$Ifa$gd4XY kd $$IfTlִ 5/%$ t06    44 laTYmkd$$IfTl/ t0644 laT $$Ifa$gd4XLLLL $$Ifa$gd4kd2$$IfTl\ 5/%$ t0644 laTXLLLL $$Ifa$gd4kd$$IfTl\ 5/%$ t0644 laT "X%Y%'XPPKCCC$a$gd $gd]7$a$gd4kdd $$IfTl\ 5/%$ t0644 laTO`Yb6  !"&-WZ$8!!!y"""""""" #·ٷٷٷud h h7B*CJH*aJphh( B*CJaJphh hD6B*CJaJphhD6B*CJaJphh h7B*CJaJphh h76CJaJh h7CJaJhE**hW h)hE**h+5CJaJh( CJaJhLvh4CJH*aJhLvh4CJaJh4CJaJ' #-###########'$*$P$l$r$z$$$$$$$$$%%%%9%̻䰨scWhD6CJaJmH sH h+5hD66CJaJmH sH h h5h 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$$Ifa$gdCD*H*a*c*d*k*l*q*r*v*w*|*}**************************** +++++++!+"+'+(+,+-+1+J+L+M+R+S+W+X+]+^+b+c+g+++++++++++++++++++++hC:hC:CJH*aJhC:CJH*aJhre2hC:CJaJhC:CJaJU_*`*d*l*r*w*}********************Ff*# $$Ifa$gd $$Ifa$gdC************+ + + ++++"+(+-+2+7+<+A+Ff) $$Ifa$gd $$Ifa$gdCFf&A+G+H+I+J+M+S+X+^+c+h+m+r+w+}+~+++++++++++Ff0 $$Ifa$gd FfG- $$Ifa$gdC++++++++++++++++++++, ,,,,,Ffd7 $$Ifa$gd Ff4 $$Ifa$gdC+++++++++++,,, ,,,,,,2,5,6,;,<,A,B,H,I,M,N,R,k,m,n,u,v,{,|,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----&-'-,---2-3-9-:->-?-C-\-^-_-d-e-j-k-hC:CJH*aJhre2hC:CJaJhC:CJaJZ,$,),/,0,1,2,6,<,B,I,N,S,X,],b,h,i,j,n,v,|,,,,,Ff"> $$Ifa$gd Ff: $$Ifa$gdC,,,,,,,,,,,,,,,,,,,,,,,,,,FfD $$Ifa$gd FfA $$Ifa$gdC,- -------'---3-:-?-D-I-N-S-Y-Z-[-\-_-e-k-r-FfK $$Ifa$gd Ff?H $$Ifa$gdCk-q-r-v-w-{---------------------------.. .*.,.6.8.D.F.N.P.X.d.f..............8/D/L/Z/\/`/h/j////ºhre2hCJaJhCJaJhre2h|CJaJhChPk36CJaJhChPk3CJaJhC:CJH*aJhre2hC:CJaJhC:CJaJEr-w-|------------------------Ff\R $$Ifa$gd FfN $$Ifa$gdC------..... .,.8.F.P.Z.d.n.x.......FfY $$Ifa$gd FfU $$Ifa$gdC..........^/`/j/n/t $$Ifa$gdmkd^$$IfTl t0644 laTFfy\ $$Ifa$gdC n/t/z/////////////////////000FfbFf` $$Ifa$gdd $$Ifa$gdC//////////00$0%0?0A0Q0R0k0m0000000000001122`333444-5.5/5650646V6Z6ǻǰҥ{hh[KCJaJhCh[KCJaJh[KCJaJhre2h[K6CJaJh,qh@_CJaJh@_h,qCJaJh4hl6CJaJh4hlCJaJh,qCJaJh4h4CJaJhXrCJaJhCJaJhre2hCJaJ00 0 00000%0(0+0.0104070:0=0@0A0R0U0X0[0]0`0c0f0FfhFfe $$Ifa$gdC $$Ifa$gddf0i0l0m00000000000000000000000FfpqFfnFfk $$Ifa$gdC $$Ifa$gdd003.5/55Z6\6`6d6h6n6t6z6666666666666FfIt $$Ifa$gdY+$a$gd[K$a$gd,qZ66666666666677$7&72747@7B7N7d7h7t7v7777777777777778 !"&,-8:@BHJMST[\agilquRX}RTVh7Mh[K5aJ h[K5aJ hXr5 h[K5h@_Uh[KCJaJhre2h[KCJaJO66666666666666677 7 77777&747B7P7Ffb|Ffy $$Ifa$gdY+FfvP7R7T7V7X7Z7`7n7|777777777777777777Ff{FfȁFf $$Ifa$gdY+0.54**0.80**0.78**0.43*0.43*0.76**0.72**FM-0.61**-0.78**-0.79**-0.42*-0.52**-0.73**-0.73**-0.77**Conclusions The presented research showed significant effect of the year in all tested parameters except Ca and Mg content in fruits, with higher values observed in dryer 2003 year. N fertilization and crop load influenced only fruit weight. Macronutrients content and fruit quality indices were significantly correlated, whereas fruit weight was in negative relation with other investigated parameters in given experimental conditions. References melik, Z., Tojnko, S., Unuk, T. 2005: Effect of fertigation with nitrogen and foliar application of some nutrients on growth, yield and apple fruit mineral composition. Pomologia Croatica, 11: 3-4. 195-209. Mitcham, B., Cantwell, M., Kader, A. 1996: Methods for determining quality of fresh commodities. Perishables Handling Newsletter, 85: 1-6. Nagy, P. T., Racsko, J., Vg, I., Holb, I. 2006: Effect of different groundcover matter on nitrogen and sulphur content of soil and leaf in apple orchard in eastern Hungary. Cereal research Communications, 34: 1. 585-588. Nagy, P. T., Thurz, S., Vg, I., Holb, I. 2007: Effect of foliar application of K and Ca on leaf and fruit contents in a sweet cherry orchard. Cereal research Communications, 35: 2. 817-820. Nava, G., Nuernberg, N. J., Pereira, A. J., Dechen, A.R. 2007: Growing fertilization for "Catarina" apple trees grafted onto marubakaido rootstock in So Joaquim, SC. Revista Brasileira de Fruticultura, 29: 2. 359-363. Nmeth, T. 2006: Nitrogen in the soil-plant system, nitrogen balances. Cereal Research Communications, 34: 1 Part 1. 61-64. Toma, j., Skalick, M., Tomova, L., Bernek, J. 2007: The effect of nitrogen and chlormequat on the translocation of Ca, Mg and K. Cereal Research Communications, 35: 2. 1069-1072. Vg, I., Balla Kovch, A., Nagy, P. T. 2007: Effects of boron, calcium an")0125=EMT\dltuVn$$^`a$gd[K$gdc0$$a$gd@_$gd@_FfFf. $$Ifa$gdY+Vjlntuceg$&4_lvxzFJ+9ce|ssqchd+Ih[K56CJaJUh@_5CJaJhW<h@_CJaJhd+Ih@_5CJaJh[KB*CJaJphhW<h[KB*CJaJph#hd+Ih[K5B*CJ]aJph hd+Ih[K5B*CJaJphh[K5CJaJhW<h[KCJaJhd+Ih[K5CJaJhE**hW h)hE**&s4lu$%'(*+-.012345gdE$$h^h`a$gd[K$$h^h`a$gd@_$$^`a$gd[Kd magnesium foliar fertilization on apple (Malus doestica) yields. Cereal research Communications, 35: 2. 1261-1264. Zavalloni, C. Marangoni, B. 2001: Dynamics of uptake of calcium, potassium and magnesium into apple fruit in a high density planting. Acta Horticulturae (ISHS), 564: 113-121.     PAGE 4 PAGE 1 e$%&()+,./123456<=>?@ABCIJKLMNOPQȷrrk hRh93hRh930JCJaJ!jhRh930JCJUaJhNh93CJaJh i0JCJaJmHnHuhNh930JCJaJ!jhNh930JCJUaJh93hEh93aJh@jh@U h[Kh[KhW<h[KCJaJhd+Ih[K5CJaJ"5@ABMNOPQ$$h^h`a$gd[K$a$gdE &`#$gdRx=0&P 1hP:p+). 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