Structural Changes in Iraqi Agricultural Sector and its Relationship with Other Economic Sectors During The Period (1990 – 2015)
A field experiment was carried out in a private farmer's farm located in AL-Qadisiyah/ Diwaniyah/ Daghara/ Sadr Al-Daghara area to study the effect of organic and mineral fertilizers on dissolved potassium values inside and outsideZea maize rhizosphere. randomized complete block design (RCBD) was designed in three replicates and included two factors: the first factor with four levels of potassium sulphatewhich are (0, 75, 150, 225) kg K. ha-1symbolized by the symbols (K0, K1, K2, K3) Respectively, and the second factor with four levelsof organic matter (poultry residues) which are (0, 10, 20, 30) tons. ha-1 symbolized by the symbols (O0, O1, O2, O3) Respectively, the seeds of Zeamaize (Zea mays L.) were cultivated in the form of lines (DKC 6120) in the form of lines on 20/7/2016.
The results showed that the addition of potassium sulphate in different levels has achieved a significant increase in the amount of soluble potassium inside and outside the soil of the root zone and for all time periods (40,70,100) days of planting and the mineral fertilizer has exceeded the organic fertilizer in increasing the amount of soluble potassium and the interaction between the highest level of potassium fertilizer 225 kg k. ha-1 and the highest level of organic fertilizer 30 tons. ha-1 (K3O3) achieved the highest amount of soluble potassium within the root zone which amounted to (0.131,0.163) cmol.kg soil-1respectively, and (0.179,0.167) cmol.kg soil-1 outside the root zone respectivelyfor the periods (40,70) days of planting respectively, while after 100 days of planting the interaction (K2O3) achieved the highest amount of soluble potassium amounted to 0.114 cmol.kg soil-1inside the root zone andtheinteraction (K3O3) achieved the highest amount of soluble potassium amounted to 0.159 cmol.kg soil-1 outside the root zone and a decrease in the amount of soluble potassium and for all treatment is noticed with the increase of plant growth time
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