Effect of adding different levels of nitrogen and potassium fertilizer on the phosphorus availability in the soil and the growth of wheat crop (Triticum aestivum L.)

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Anmar Hamoudi Kadhim, Mohamed Karim Obaid

Abstract

 


An experiment was conducted in the garden of the College of Agriculture, Al-Muthanna University for the agricultural season 2017-2018, to determine the adding nitrogen fertilizer (urea) CO (NH2)2 and potassium (potassium sulfate) K2SO4, with different availability phosphorus levels in soil and growth of wheat crop cultivar (Ibaa 99). Treatments were arranged according to RCBD with four replicates. The levels of nitrogen fertilizer (200, 400 and 600) kg N ha-1 and potassium fertilizer (100, 150 and 200) kg K2O ha-1 were distributed in plastic pots. The results showed that the application levels of 600 kg N ha-1 and 200 kg K2O ha-1 gave the highest average availability of phosphorus in the soil in the seedling and flowering stages, while the levels gave 200 kg N ha-1 and 100 kg K2O ha-1 the lowest levels, at the same stages. Addition levels of 600 kg N ha-1 and 200 kg K2O ha-1 gave the highest mean for plant height, leaf chlorophyll content and number of tillers, while the levels of 200 kg N ha-1 and 100 kg K2O ha-1 gave the lowest mean for the same traits.


 

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Anmar Hamoudi Kadhim, Mohamed Karim Obaid