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Kutatómunkánk elsődleges célja a repce és napraforgó tarlómaradvány N-tartalmának Magyarországra jellemző reprezentatív értékeinek meghatározása volt az országos statisztikai termésadatok és a növényminták N-tartalmának laboratóriumi mérése alapján. Továbbá összefüggést kerestünk a talaj és a növény N-tartalma között.

Vizsgálataink során egész Magyarországot reprezentáló mintavételt végeztünk repce és napraforgó állományokból, 126 növény- és mintegy 70 talajmintát gyűjtöttünk be, melyek N-tartalmát laboratóriumban határoztuk meg.

Kiszámoltuk a két növény országos termésátlagával keletkező tarlómaradvány mennyiségét és a mért N-tartalom értékek alapján megbecsültük a tarlómaradványok N-tartalmát. Összefüggést mutattunk ki a talaj és a növény N-tartalma között. Esettanulmány jeleggel kiszámítottuk egy olyan terület N-mérlegét, amelyre vonatkozóan rendelkezésre áltak a számításhoz szükséges adatok.

Eredményeink legfőbb gyakorlati vonatkozása, hogy a növényi maradványok felszecskázása és talajba dolgozása útján visszapótolt N mennyiségének meghatározása hosszabb távon hozzájárulhat a növénytáplálás költségeinek csökkentéséhez, illetve a természeti erőforrásokkal való takarékosabb gazdálkodáshoz.

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Research Communications. 35. 573–576. Németh, T., 2006. Nitrogen in the soil-plant system, nitrogen balances. Cereal Research Communications. 34. (1) 61–64. Németh, T

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The aim of the study was to determine K-factors of homogeneous zones in palm-groves in order to make possible the interpolation of these values to other similar areas, and by this way to help the calculation of draining parameters. Another goal was to interpret the agronomical aspects of the results. Investigations for the determination of conductivity factors (K-factors) were carried out in the palm-groves of the Oued Rhir Valley. The measurements  - conducted three times - were made by the auger-hole method. After boring the hole, a perforated cylinder was placed into it to prevent falling in. K-factor values were calculated after van Beers. The mean of the three calculations was given as the end result for the K-factors. Our results show that K-factor values are influenced by the porosity, type, bulk density and texture of soils, their salt content and the form of gypsum. The K-factor was extremely high in case of sandy soils and soils containing crystallized gypsum. Water conductivity was moderate in case gley and pseudogley were located in deeper layers. The lowest values occurred when gypsum was found in cemented coherent particles. Salinization in deeper layers influenced hydraulic conductivity only in case it was associated with finer texture and airless layers. Besides date production, the traditional growing of nitrogen-fixing perennial legumes (alfalfa, Egyptian clover, melilot, etc.) in palm-groves is essential.  Systemic flooding irrigation decreases the salt content of soils, increases date and legumes yields. Legumes - by their root-system - improve the nitrogen balance, structure and water drainage of soils. The green parts of the cultivated legumes serve as fodder for animals (goats, sheep, cows), which turn it to manure. This manure increases the nutrient supply of the soils for palm-trees and vegetables. The positive results of stubble and root manuring (green manuring) of legumes is also confirmed by experiments on sandy soils. The elaboration of a good plant rotation is possible. At last, date and vegetables produced in this way could be sold better on the world market as bioproducts.

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. (3–4) 205–206. Németh , T., 2006. Nitrogen in the soil–plant system, nitrogen balances. Cereal Research Communications. 34. (1) 61–66. Pozsgai , J., 1988. A

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RAJKAI, K,. GEMMA, M. & NÉMETH, T., 1998. Nitrogen balance of agricultural soils of Hungary. In: Soil Pollution. (Ed.: FILEP, GY.) 184-199. Agricultural University of Debrecen. TEMPUS JEP 9240. Debrecen. Nitrogen

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. Németh , T., 1996. Nitrogen balances in long-term field experiments. Fertilizer Research. 43. 13–19. Palkovits G. & Koltai G., 2004. A talaj vízgazdálkodása és a növényi produkció kapcsolata különös

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Applied Science. New York. Nyiraneza, J., 2003. Nitrogen recovery and nitrogen balance with 15 N in potato systems amended with cover crops and manure. M.S. Thesis. Michigan State University. East Lansing

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Reaction Kinetics, Mechanisms and Catalysis
Authors: Shakeel Ahmed, Faizur Rahman, Adnan M. J. Al-Amer, Eid M. Al-Mutairi, Uwais Baduruthamal, and Khurshid Alam

were used to separate H 2 , N 2 , O 2 , CO, CO 2 and HCs gases. The detector was kept at 140 °C, while the column and the injector was kept at 130 °C. Argon was used as a carrier gas at a pressure of 60 kPa. Carbon and nitrogen balances were

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solution with 2.5 g/L of 1% Mg/Cu Nitrogen balance Because nitrate can be reduced to species such as nitrite, ammonium and nitrogen, this study also investigated the reaction

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