Effect of perlite and nitrogen level on potassium availability in soil and yield of wheat (Triticum aestivum L.)

This study was conducted at Al Majd area in Al Muthanna Governorate (Away from the city center about 5 km to the north), to study the effect of perlite and nitrogen level on potassium availability in soil and the growth and yield of wheat (Triticum eastvum L.), during the agricultural season 2022-2021. A factorial field experiment, according to a Randomized Complete Block Design (RCBD) with three replicates. The experiment included two factors, the first factor is the addition of perlite with three levels (0, 1.5 and 3)% symbolized by B0, B1 and B2 respectively, while the second factor is nitrogen at five levels (0, 50, 100, 150 and 200) kg N ha-1 has the symbol N0, N1, N2, N3 and N4 respectively. The land was divided into plots, included 45 experimental units in three blocks, the area of the experimental unit (2 × 2) m2 The experimental unit included 8 lines with a length of 2 m, the distance between one line and another was 20 cm, leave a distance of 75 cm between one replicate and another. The seeds of wheat (Bohooth 22 cultivar) were sown on 11/11/2021. The results indicated the significant effect of adding perlite at a level of 3% by volume of the soil, by increasing of availability nitrogen and potassium in the soil when adding the first and second batch of nitrogen, and reducing the degree of soil reaction to the first and second batches of adding nitrogen to the soil, There was no significant difference between fertilizer to the soil at a level of 150 and 200 kg N ha-1 on the increase of availability nitrogen in the soil at the first and second batch of adding fertilizer and at harvest, increasing the availability potassium in the soil for the first and second batches of adding nitrogen fertilizer, with reducing the degree of soil reaction to the two batches of fertilizer added.