Effect of different levels of humic acids on the nutrient content, plant growth, and soil properties under conditions of salinity
2011
Khaled, H.,Al-Azhar Univ., Cairo (Egypt). Soils and Water Dept. | Fawy, H.A.,Desert Research Center, Cairo (Egypt). Soil Fertility and Microbiology Dept.
The effects of salinity, foliar and soil applications of humic substances on the growth and mineral nutrients uptake of corn (Hagein, Fardy10) grown at various salt concentrations were evaluated. Sodium chloride was added to the soil to obtain 20 and 60mM saline conditions. Solid humus was applied to the soil one month before planting and liquid humic acids were sprayed on the leaves twice on the 20th and 40th days after seedling emergence. The application doses of solid humus were 0, 2 and 4 g/kg and those of liquid humic acids were 0, 0.1 and 0.2%. Salinity negatively affected the growth of corn; it also decreased the dry weight and the uptake of nutrients except for Na and Mn. Soil application of humus increased the N uptake of corn while foliar application of humic acids increased the uptake of P, K, Mg, Na, Cu and Zn. Although the effect of interaction between salt and soil humus application was found statistically significant, the interaction effect between salt and foliar humic acids treatment was not found significant. Under salt stress, the first doses of both soil and foliar application of humic substances increased the uptake of nutrients.
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