NATURAL PHYTOHORMONE - INDOLE-3-ACETIC ACID IN PEATS,SUBSTRATES FOR HORTICULTURE AND POMOLOGY L.W. Szajdak, V. Maryganova
szajlech@man.poznan.pl
** Institute for Problems of Natural resources Use and Ecology, National Academy of Sciences of Belarus, Minsk,
Belarus, vmaryganova@mail.ru
The content of indole-3-acetic acid (IAA) in different kinds of horticultural and pomology substrates and different kind of peats was measured.
In commercial substrates the highest content of IAA was determined in substrate prepared on the basis of vermicompost, manure and poultry litter. The content of IAA in this substrate was equal to 3417,8 qg^kg-1 of dry mass. High content of IAA was also measured in substrates prepared from waste products and sewage sludge. For these substrates the concentrations of IAA ranged from 323,9 to 373,9 qg^kg-1. Hoverer low contents of IAA was determined in substrates including high moor peat, clay and perlite. In these materials the quantities of IAA ranged from 171,1 to 273,9 qg-kg-1. The lowest content of this auxine was determined in new kokos and was equal to 101,8 qg-kg-1. However the substrate containing different kind of peats characterized also by the lowest quantity of IAA. In this substrate the content of IAA was equal to 102,7 T qg-kg-1. This material growing media is used in the basis for substrates for flower and vegetable cultivation.It was observed that the content of IAA for peat samples depends on the kind of peat. The highest amount of the IAA content was determined for high-moor Pine Sphagnum and Eriophorum Sphagnum peats with the decomposition degree (R) of 30-35 % (185,2 qg-kg-1). In all other peat samples the IAA content was ranged from 108,6 to 144,2 qg-kg-1.
The highest concentrations of IAA was determined in commercial substrate prepared on the basic of vermicompost, manure and poultry litter. High moor peat represented high content of IAA but than low moor peat from all countries revealed the lowest concentrations of IAA. The concentrations of IAA in low moor peats were similar to determined in the substrate with new kokos.
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