Humic acids increase the resistance of wheat to progressive salinity

Abstract

Salinity is one of the chief factors of soil fertility decreasing and soil degradation. The influence of lowland peat humus acids preparation on spring wheat (Triticum aestivum L.) resistance to progressing chlorine salinity was investigated. The plants were grown in aquatic culture on Hogland nutrient mixture. The progressing salinity was created with the help of NaCl concentration from 25 to 100 mM by 25 Mm step every 14 days. Variants of permanent salinity included 75 and 100 mM. In all the variants of the experiment the plants were grown with addition of peat humus acids preparation (0,005%) or without it. In the result of the experiment it was stated that humic acids protective action is more manifested under strong stress influence, NaCl permanent concentration being 100 Mm, herewith the degree of plants salinity resistance in presence of humic acids increases 1,5-2 times. Under progressing salinity humic acids preparation protective action is observed only on the 14-th (25Mm) and 28-th (50 Mm) days after salinity beginning. Peat humic acids preparation was found to decrease Sodium accumulation in wheat shoots almost twice under progressing salinity up to 100Mm and 2,3-2,7 times in the variants of permanent salinity.