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Leaching kinetics of atrazine and inorganic chemicals in tilled and orchard soils

100%

Szajdak L. W., Lipiec J., Siczek A., Nosalewicz A., Majewska U.

International Agrophysics

2014

tom 28

nr 2

The aim of this study was to verify first-order kinetic reaction rate model performance in predicting of leaching of atrazine and inorganic compounds (K+1, Fe+3, Mg+2, Mn+2, NH4 +, NO3 - and PO4 -3) from tilled and orchard silty loam soils. This model provided an excellent fit to the experimental concentration changes of the compounds vs. time data during leaching. Calculated values of the first-order reaction rate constants for the changes of all chemicals were from 3.8 to 19.0 times higher in orchard than in tilled soil. Higher first-order reaction constants for orchard than tilled soil correspond with both higher total porosity and contribution of biological pores in the former. The first order reaction constants for the leaching of chemical compounds enables prediction of the actual compound concentration and the interactions between compound and soil as affected by management system. The study demonstrates the effectiveness of simultaneous chemical and physical analyses as a tool for the understanding of leaching in variously managed soils.

Impact of growing media with indole-3-acetic acid addition on the development of root system of ornamental plants

86%

Szajdak L. W., Nowak J. S., Meysner T., Styla K., Gaca W., Szczepanski M.

Acta Scientiarum Polonorum. Hortorum Cultus

2015

tom 14

nr 6

The impact of the addition of indole-3-acetic acid (IAA) to three commercial growing media and three self-prepared growing media on rooting of cuttings of two or-namental plants: Hydrangea L. and poinsettia Euphorbia pulcherrima ‘Prestige Early Red’ was evaluated. According to the assessment of root system, length of roots, fresh and dry mass of roots, percentage of rooted cuttings the best rooting of cuttings of Hy-drangea L. in Ceres and GM2 and of Euphorbia pulcherrima in Klasmann Steck Medi-um, GM2 and GM3 independent of the doses of IAA was observed. The addition of 200, 300 and 400 μg kg-1 IAA for GM2 and GM3 improved some of the parameters rooted cut-tings of Euphorbia pulcherrima. The worst assessment of root system and percentage of rooted cuttings for both ornamental plants with the lowest pH in GM1 as compared to other growing media was shown. Furthermore, 400 μg kg-1 addition of IAA for Klasmann Steck Medium caused significant on higher length of roots and dry mass of roots of Eu-phorbia pulcherrima.

Ograniczanie wyników

1 Acta Scientiarum Polonorum. Hortorum Cultus

1 International Agrophysics

2 Szajdak L. W.

1 Gaca W.

1 Lipiec J.

1 Majewska U.

1 Meysner T.

1 Nosalewicz A.

1 Nowak J. S.

1 Siczek A.

1 Styla K.

1 Szczepanski M.

1 2015

1 2014

Wyniki wyszukiwania

Leaching kinetics of atrazine and inorganic chemicals in tilled and orchard soils

Impact of growing media with indole-3-acetic acid addition on the development of root system of ornamental plants