ANBAR JOURNAL OF AGRICULTURAL SCIENCES

Abstract

To study the effect of phosphogypsum and humic acids in the growth and yield of barley in saline soil. A field experiment was conducted in calcareous soil (Saline - Sodic), her salinity before addition of the study factors was 73.78 dS m-1. After plowing, smoothing and leveling, the field is divided into three replicates according to the design (RCBD), where each replicate included 16 experimental units (plot) with an area of 3.0 m2, four levels of phosphogypsum 0, 5, 10 and 15 tons ha-1 with symples PG0,PG1, PG2 and PG3 respectively, and four levels of humic acids 0, 50, 100 and 150 kg ha-1 with symples HA0, HA1, HA2 and HA3 respectively, were added and mixed with the surface layer 0-15 cm for each plot at random. After the addition was carried out the leaching process of soil by adding leaching water equivalent to twice the size of soil pores to a depth of 0-30 cm, then the values of ECe and ESP reached a depth of 0-30 cm at a rate of 17.71 dS m-1 and 8.02 % sequentially, the seeds of barley were planted in lines. After harvest, the height of the plant, the straw yield, the grain yield per hectare, and the nitrogen, phosphorus and potassium content were measured. The results showed a significant increase in all the traits of growth and production of barley plants by increasing the level of addition, whether of phosphogypsum or humic acids, the interaction between phosphogypsum and humic acids gave a highest increase in the growth and yield characteristics. As the treatment PG3HA3 was given the highest rate of plant height, straw yield and grain yield per hectar, 100.32%, 183.55% and 99.10% sequentially relative to the non-additive treatment. The grain content of nitrogen, phosphorus and potassium was significantly increased by increasing the level of addition, whether of phosphogypsum or humic acids, the interaction between phosphogypsum and humic acids showed the highest increase in grain content of the three elements. As the treatment PG3HA3 was given the highest concentration of nitrogen, phosphorus and potassium with an increase of 169.62%, 69.52% and 112.81% sequentially relative to the non-additive treatment.