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The surplus of the NPK balances of Hungarian agriculture, appearing in the nutrient balance sheet is a consequence of intensive fertilization in the past. Hungary had a positive P-balance between 1960 and 1990 for 30 years, and a positive NK-balance between 1970 and 1990 for 20 years during the 20th century.Studying the long-term effects of superphosphate in a field experiment on calcareous chernozem soil, it was found that the “half life time” of residual P was 5–7 years. The trial, i.e. the P after-effect lasted for 20 years.Liming and fertilization are the main soil fertility improving considerations for acidic sandy soils. These soils are often poor in all major nutrients. Mineral fertilizers, mainly NH4NO3, acidify soil, the pH values sink in comparison to the unfertilized plot. Liming and use of dolomite powder may counterbalance the acidification.

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The composition of precipitation and element loads originating from rainwater were examined monthly between 2005 and 2008 at two experimental stations (Őrbottyán in the Danube–Tisza Interfluve region and Nagyhörcsök in the Mezőföld region of Hungary) of the Research Institute for Soil Science and Agricultural Chemistry (RISSAC) of the Hungarian Academy of Sciences. Twenty-five characteristics were analysed: pH, EC, NO 3 -N, NH 4 -N, and concentrations of the main macro- and microelements. The observation represents the dry and wet deposition together. Measurements were carried out by ICP-OES device, with the exception of carbonate, chloride, ammonia and nitrate. The main results can be summarized as follows: – Generally, the lower amounts of monthly precipitation resulted in higher EC, pH; NH 4 -N, Ca, Na and K concentrations. The highest element yields, however, were typical of the wet months. Acidic precipitation (below pH 5) was rich in nitric acid forming NO 3 -N, but poor in NH 4 -N at the Őrbottyán Experimental Station. Emission of the nearby cement works in February and March 2006 caused an order of magnitude higher increase in Ca, Mg, Na and Sr elements as compared to other months, and there was a considerable rise in the NH 4 -N, S, Zn, As, Cr and Pb concentrations of the precipitation (Table 5, 1st half of the year). The pH reached 7.0 at this site. – Depositions were small at the Nagyhörcsök Experimental Station in winter. During the warmer months (May, June and July) the NH 4 -N concentration was 10–20 times higher than the NO 3 -N concentration. The neighbouring fertile and humus rich soils, fertilization, as well as the nearby animal husbandry farm make notable NH 3 emission. In this period the concentration of NH 4 -N and the alkalizing cations Ca and K raised the precipitation’s pH, and the pH increased from January to June. – Aerial deposition varied greatly at both sites, representing the following values in kg·ha -1 ·year -1 unit: NO 3 -N 5–20; NH 4 -N 10–31; total N 30–48; Ca 6–60; K 6–16; S 2–21; Na 4–13; Mg 2–16; P 2–6. The deposition of Zn, Mn, Fe, Cu and B elements at these sites were similar to previous Hungarian and Austrian data. Pb, Ni, Cd and Co depositions, however, were an order of magnitude lower, which demonstrates the positive result of the successful control of heavy metal pollution in Europe since 1990. – Aerial deposition has considerable agronomical and environmental significance. According to the present study, aerial deposition could satisfy 10% K, 15% Mg, 20% P, 30% Ca and N, 40% S element demand of an average 5 t·ha -1 grain and 5 t·ha -1 straw yield of cereals on the chernozem soil of the Nagyhörcsök Station. When using combine harvesting, the straw remains on the site and only the grain is removed, so 25% P, 45% K, 100–300% S and Ca, and several fold of Na-requirement could be covered by the aerial deposition. – Atmospheric deposition may more or less compensate the amount of Mo, Ni and Se built in by grain, while the Zn requirement might be exceeded by about 60%. The deposition of B, Ba, Cu and Sr is several times higher than the amount built in by the grain yield. Aerial fertilization with Cu, Mo, Se and Zn seems to be advantageous, as the site is poor in Zn and Cu, or not satisfactorily supplied with Mo and Se elements. Cd, Hg and Pb loads, however, are environmentally disadvan-tageous, especially on the long-term. The latter harmful heavy metals can also get into waters, on the surface of crops and can cause direct damage to the food chain. – The following minimal – maximal depositions were measured on the two experimental sites: Zn 112–1391; Sr 30–202; Cu 21–153; Fe 42–119; Ba 40–79; Mn 33–62; B 0–33; Pb 2–4; Ni, Cr and Mo 0–6; As 0–4; Hg 0–1.5; Co 0.4–0.7; Cd 0–0.3 g·ha -1 ·year -1 . The pH varied between 4.2 and 7.0 while electrical conductivity ranged between 25 and 1996 μS·cm -1 .

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Shaaban, M. M., Abou El-Nour, Z. A. A. (1996): The nutrient balance in Egyptian clover ( Trifolium alexandrinum ) as it affected the yield. J. Agric. Sci., Mansoura Univ. , 21 , 2293–2299. Abou El

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The importance and necessity of long-term field experiments lie in the fact that long-term effects can only be studied reliably over several decades. The agronomic advances made in recent decades, based on chemicals and genetic gains, can be measured using long-term data, which will also be important in the future. Nutrient balances can be estimated reliably from the results of these experiments. The effect of climate change can be estimated by comparing long-term data from different locations. Long-term databases also form the background for computer models, designed to promote the sustainable development of agriculture and the environment.

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The current study was carried out in both pot and field conditions to investigate the effects of three KSB strains of Pantoea agglomerans, Rahnella aquatilis and Pseudomonas orientalis on nitrogen (N), phosphorous (P) and potassium (K) uptake, nutrient use efficiency parameters and nutrients remobilization in rice (Oryza sativa L. cv. Pajohesh). The experiments included 15 treatments of KSB inoculations, commercial K biofertilizer and K chemical fertilizer. The results showed that the inoculums of all three KSB strains increased the K, N and P uptake by grain and straw, especially when applied in combination with ½ K chemical fertilizer (47.5 Kg/ha) as compared to the control treatment. The highest value of available K in the soil obtained from NPK chemical fertilizer equal to 140.1 and 134.6 mg K per kg of soil in the pot and field experiments, respectively, which were significantly higher than KSB inoculations treatments. Bacterial inoculums coupled with ½ K chemical fertilizer also enhanced the nutrient use efficiency (including agronomic efficiency (AE), apparent recovery efficiency (ARE), physiological efficiency (PE), agro-physiological efficiency (APE), internal utilization efficiency (UE), partial factor productivity (PFP), partial nutrient balance (PNB)) and nutrient remobilization. The results indicated that the bioinoculation with these KSB strains isolated from soil paddy could be considered as an effective way to increase potassium, nitrogen and phosphorus uptake by rice plant and enhance their use efficiency and remobilization to grains in the flooding irrigation conditions.

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–25, Opatija, Croatia, p. 50. Vomel A. (1966): Nutrient balance in various lysimeter soils. I. Water leaching and nutrient balance. Z. Acker-u. Pflanzenbau, 123, 155–188. Vomel A

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Cereal Research Communications
Authors: Zdenko Loncaric, Domagoj Rastija, Krunoslav Karalic, and Brigita Popovic

25 175 181 Buerkert, A., Nagieb, M., Siebert, S., Khan, I., Al-Maskri, A. (2005): Nutrient cycling and field-based partial nutrient balances in two

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Összefoglalás

Talaj- és növényvizsgálatokkal, továbbá egzakt szabadföldi kisparcellás kísérletek terméseredményeivel és biomassza mérésével járultunk hozzá az eddigiek során a hazai és nemzetközi irodalmakban leírtakhoz, hangsúlyozva azt, hogy az eredményeink elsősorban a nyugat-dunántúli barna erdőtalajokon járulhatnak hozzá a növénytermesztési technológiák fejlesztéséhez, a talajtermékenység fenntartásához és fokozásához.

– A számításokból tápanyagmérlegeket, fajlagos értékeket és más paramétereket készítettünk, amelyből számos következtetés vonható le.

– A kombinációk, kezelések átlagában az NPK fajlagos arányok a szemtermésben 2,3–0,5–0,4 mg/kg-ra becsülhetők, a szalmatermések NPK aránya 0,4–0,1–1,3 mg/kg volt. A kísérletek tápanyagmérlege azt mutatja, hogy a legnagyobb terméseket a N mérlegegyensúly közelében határozhatjuk meg, a talaj természetes ásványi N szolgáltató képessége 30–40 kg/ha értékre becsülhető. A pozitív P mérleg miatt a P jelentősen feldúsult a talajban (300–700 mg/kg AL-P2O5), a gyakorlatban ilyen értékeknél a P műtrágyázás szüneteltethető. A N műtrágyázás agronómiai hatékonysága 40–70% volt.

– Fel kell hívni a figyelmet a talajok C tartalmának, illetve humusztartalmának megőrzésére és fokozására, amely a fenntartható mezőgazdasági fejlődés záloga. Ugyanakkor az ezzel kapcsolatos túlzott elvárásoktól tartózkodni kell (CO2 termelés, sink hatás, a CO2 lekötése a körforgalomból) (Körschens 2008).

– A talaj multifunkcionális tulajdonságokat tartalmazó érték, amely talajfizikai és agrokémiai, továbbá szerves anyag és víztároló szerepet működtető rendszer nagy értéket hordoz (Várallyay 2007).

– Dolgozatunkban és publikációinkban az egyes kísérleti eredményeken keresztül újabb információkat adunk az optimálisnak tűnő N, P, K műtrágyázás gyakorlatához, a kemizáláshoz, a vízmegőrző és talajvédő talajművelés rendszeréhez, a különböző szerves trágyák fontosságát hangsúlyozva a műtrágyázás mellett. Az eredmények felhasználhatók a vetésváltási rendszerek tervezéséhez, a CO2 körforgalommal és bioenergetikával kapcsolatos kutatásokban is.

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Agricultural goods obtained and produced in Hungary have played an important role in the markets of Western Europe. By utilizing the ecological potentials of the Carpathian Basin, local inhabitants are in the position to produce considerable food surpluses in addition to meeting their own demands. With agricultural production becoming more and more intensive in Hungary, the application of mineral fertilizers also started to increase slowly from the 1960’s. From the mid-1970’s a uniform sampling, soil testing and fertilization extension system was created together with its own institutional and laboratory testing network. The intensive use of mineral fertilizers in Hungary lasted from the mid-1970’s to the last quarter of the 1980’s, during which an average amount of 230 kg·ha -1 NPK fertilizer was applied. In this period the so-called “build-up” fertilization was applied in conformity with the improvement of all other elements involved in the production technology, which was also clearly expressed in the agro-political objectives of those days aiming to obtain higher yields. At that time the nutrient supply and nutrient base of soils in Hungary increased clearly, so the production technology could no longer limit higher yields. In 1990 agriculture changed fundamentally and radically in Hungary, and the same was valid for nutrient supplies as well. At the beginning of the 1990’s there was a sudden decrease in the level of mineral fertilizer application (to below 40 kg NPK active ingredients·ha -1 ), followed by a slow increase, which has reached the level of almost 70 kg·ha -1 by today. In the meantime the animal stock in Hungary has decreased and consequently the amount of manure has also fallen. All in all, the nutrient balance of Hungarian soils has always been negative since 1989. Due to the changes in its structure and ownership over the past twenty years or so, it has become very difficult to obtain reliable information about Hungarian agriculture. The Soil Resources Management General Partnership (in Hungarian: Talajerőgazdálkodás Kkt.) conducts extension work based on soil sampling and has a continuous flow of data on over thirty thousand hectares, beginning at the end of the 1970’s. Based on the analyses of these data it can be stated that the extra amount of nutrients over balance, applied during the period of replenishment (until the change in regimes) has been „removed” from the soil over the past fifteen years, consequently the Hungarian nutrient balance has become negative again. This kind of fertilization practice cannot be sustained in Hungary, as the maintenance of the production potential of Hungarian soils is far from being resolved at the moment; it poses risks to and questions sustainability, as well as it may cause a very serious competitive disadvantage to the country.

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Összefoglalás

Munka a műtrágyázási szaktanácsadás alapelveit és gyakorlati módszerét taglalja. Röviden áttekinti a növénytermesztés szemszögéből fontosabb talaptípusokat a termékenységüket meghatározó tulajdonságaik alapján (mechanikai összetétel, kémhatás, illetve mésztartalom). A talaj minőségének, trágyaigényességének elbírálásához közli a fontosabb talajfizikai és talajkémiai jellemzőket és határkoncentrációkat.

Kitér az alapvető tápelemek élettani hatásaira, illetve agronómiai jelentőségére. Bemutatja a trágyaszükséglet becslésének módszereit: szabadföldi kísérlet/próba, talajvizsgálatok, táblatörzskönyvi adatok felhasználása, tápelemmérleg készítése, egyéb trágyaigényt módosító tényezők figyelembe vétele.

Végül kitér a műtrágyázás és a környezetvédelem összefüggéseire. Hangsúlyozza, hogy a szakszerű műtrágyázás a talaj hiányosságait pótolva egészségesebb talajt, talajéletet, növényi és állati közösségeket eredményezhet. A trágyázás, műtrágyázás nemkívánatos mellékhatása (terméscsökkenés, minőségromlás, talaj- és talajvíz szennyeződése, stb.) akkor jelentkezhet, amikor a tápelemeket természetellenes formában, mennyiségben, arányban szakszerűtlenül használjuk.

Közlemény a szaktanácsadásban érintettek számára íródott útmutató.

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