Tamás Szegi

EFFECTS OF DIFFERENT BIOCHARS, COMPOST AND LIME TREATMENTS ON THE CHEMICAL PROPERTIES OF SANDY SOILS

Decrease in organic matter of the soil is one of the major threats to soils in Europe and other parts of the globe. Maintaining or increasing organic carbon is a great challenge in agricultural practices. Application of composts and other organic amendments is an important way of compensation of losses of organic carbon at the same time it is solving the placement and recycling of organic wastes and residues. The favorable effect of these amendments on physical, chemical and biological properties has been proved by

Javaslat talajosztályozási rendszerünk megújítására: alapelvek, módszerek, alapegységek

A jelenlegi, 1960 evekben kidolgozott genetikus alapokon nyugvo magyar talaj-osztalyozasi rendszerunk modernizalasara az elmult evtizedek hazai tapasztalatai, dokumentalt adathalmazai, valamint a nemzetkozi standardok es elvarasok alapjan teszunk javaslatot. Munkank kiindulasi alapja az elődeink altal definialt 29 talaj-kepző folyamat, 39 talajtipus, es az azokhoz kapcsolodo tartalmi leiras es vizsgalati adatokbol nyert informacio. Modszereink az egyszerű elemzesek es statisztikai szamitasok mellet a pedometria modszerere, a taxonomiai tavolsagszamitasra es klaszteranalizisre tamaszkodtak. Eredmenyeink alapjan a jelenlegi hazai talajtipusok egy resze jol elkulonithető, masok pontosabb definiciora szorulnak, vagy egyes esetekben osszevonasra kerul-hetnek. A nemzetkozi gyakorlatban meglevő es hazankban is jellegzetes tipusokat pedig, bevezetesre javaslunk. A szigorubb es mind a melysegi, morfologiai es osszetetelbeli tulajdonsagok te-kinteteben szamszerűbb meghatarozasokon alapulo javasolt struktura kozpont...

Comparison of biological and chemical properties of arable and pasture Solonetz soils

Soil samples were collected from salt-affected soils (Solonetz) under different land uses, namely arable (SnA) and pasture (SnP), to investigate the effects of land use on microbiological [basal soil respiration (BSR), microbial biomass carbon (MBC), dehydrogenase activity (DHA) and phosphatase activity] and chemical properties [organic carbon (OC), humic ratio (E4/E6), pH, electrical conductivity (EC), ammonium nitrogen (NH 4- N), nitrate nitrogen (NO 3- N), available forms of phosphorus (P 2 O 5 ), potassium (K 2 O), calcium (Ca 2+ ), magnesium (Mg 2+ ), sodium (Na + )] and on the moisture content. The results showed that the two sites, SnA and SnP, were statistically different from each other for all the microbiological and chemical parameters investigated except Na+ and moisture content. Higher values of MBC (575.67 μg g -1 ), BSR (9.71 μg CO 2 g -1 soil h -1 ), DHA (332.76 μg formazan g -1 day -1 ) and phosphatase activity (0.161 μmol PNP g -1 hr -1 ) were observed for the SnP soil. Great heterogeneity was found in SnP in terms of microbiological properties, whereas the SnA plots showed more homogeneous microbiological activity due to ploughing. 75.34% of variance was explained by principal component one (PC1), which significantly separated SnA and SnP, especially on the basis of soil MBC and P 2 O 5 . Moreover, it was concluded that the pasture land (SnP) was microbiologically more active than arable land (SnA) among the Hungarian salt-affected soils investigated.

Javaslat a hazai láptalajok osztályozásának megújítására

A szerves talajok osszetetele, kepződesi korulmenyei, es foldrajzi, ill. domborzati elterjedese jelentősen elter az asvanyi talajoketol. A tomegukben megőrzott hatalmas mennyisegű szerves szen es kornyezetuk biologiai sokfelesege (biodiverzitasa) kapcsan a klimavaltozas altal leginkabb erintett talajok, ezert megkulonboztetett figyelem iranyul e talajokra. Kiterjedesukre, lebomlottsagi fokukra, szerves szenkeszletukre igen elterő irodalmi es terkepi adatok allnak rendelkezesre. Ugyanakkor eppen a klimavaltozas vonatkozasaban oriasi a globalis es helyi megbizhato adatigeny az emlitett kerdesekben. Hazai laptalajaink osztalyozasi, felvetelezesi es mintaveteli modszereinek megujitasara teszunk javaslatot a nemzetkozi standardok figyelembe vetelevel. A megujitott Laptalaj meghatarozasban a legfontosabb kovetelmenyek a 20% szerves szentartalomra, a 40 cm vastagsagra es az alacsony terfogattomegre vonatkoznak. Az altipus es valtozati tulajdonsagok a lebomlottsag fokat, a melysegi, kemhatas viszonyokat, ill. sok...

Improving management properties of sandy soils by organo-mineral additives

Sandy soils generally lack of organic and mineral colloids, they have small active surface, low cation exchange capacity (CEC), nutrient supply and buffering capacity and have unfavorable structure developing capability. A common source of organic matter is liquid manure. Application of liquid manure however bears environmental risk, such as leaching of nitrogen or runoff with erosion. (Stefanovits et al., 1999) In the present work, organo-mineral complexes were used to improve the physical and chemical characteristics of sandy soil from the Nyirseg, a representative sandy area of Hungary, to develop better physical, and chemical soil properties and to reduce the hazard of nutrient and organic matter loss and pollution.