Effect of Fulvic Acid and Seaweed on the Nutrient uptake and Some Soil Chemical Properties

Abstract

A field experiment was conducted in the Mandali of Diyala governorate during the fall season 2021 to study the effect of fulvic acid by adding five levels (control, 150 kg ha-1, 300 kg ha-1, 2.5 g L-1 and 5 g L-1) and seaweed by foliar application (control, 3 ml L-1 and 6 ml L-1) in the growth and yield of broccoli and some soil characteristics. The experiment was carried out according to a randomized complete block design (RCBD) as a factorial experiment with three .The results showed that the levels of fulvic acid were superior in most of the studied traits compared to the control treatment and the intraction between fulvic acid and seaweed in all studied traits compared to the comparison treatment. The superiority of the level of ground addition with fulvic acid at a concentration of 300 kg ha -1 (F2) increased of availability of pH, EC, nitrogen , phosphorous and potassium 7.08 , 2.01 dS m-1 33.96 mg kg-1 soil and 40.17 mg kg-1 soil and 273.5 mg kg-1 soil respectively, (F3) exceeded concentration of phosphorous and potassium in the flower disk with a value 0.42% and 2.915% , respectively, and the level (F4) exceeded in the concentration of nitrogen and sulfur in the flower disc with a value of 4.807%, 0.374 respectively, as for spraying seaweed extract, (S2) exceeded in most of the studied characteristics such as the available of pH , nitrogen concentration , phosphorous concentration, potassium , sulfur concentrations in flower disc with a value of 7.13, 33.55 mg kg-1 soil and 34.56 mg kg-1 soil ,2.924%, 0.353 % respectively while the control treatment gave the lowest values for all studied traits.