Effect of Soil Addition of Humic, Fulvic Acids and Irrigation Water Salinity on the Yellow Corn Zea mays L. Growth

Abstract

A field experiment was carried out during the two spring seasons 2020/2021 in an agricultural field, located on the banks of the Euphrates River in Al-Muthanna Governorate, which is 4 km away from Al-Muthanna University, between latitudes 45°14′58″ and longitudes 31°19′33″, to study the effect of adding humic and fulvic organic acids and irrigation water salinity on the growth traits of corn crop Zea mays L., in an experiment whose treatments included three levels of concentrations of a mixture of organic acids (humic and fulvic) which were 0, 20 and 40 liters of ha-1, four levels of electrical conductivity of the irrigation water used in the irrigation process, it was less than 2.0 dSiemens m-1 using pure water RO mixture with river water, and 4.0, 6.0 and 8.0 dSiemens m-1 using a mixture of tap water and river water. The results showed a significant effect between irrigation water salinity levels on plant height, where the transaction decreased by 8.0 dSiemens m-1, significant effect between the levels of humic and fulvic organic acids in the leaf area cm2, where the treatment exceeded 20 liters ha-1, there was a significant interaction between humic and fulvic acid levels and irrigation water salinity levels, the combination (40 L × salinity comparison) a high leaf area and dry matter.