Impact of Nitrogen Fertilization on Iron Uptake by Maize Grown in Calcareous Soil

F Hellal, F Hellal, M Seeda, Safaa, A Mahmoud
2006 Journal of Applied Science Research   unpublished
Pot experiment was conducted to evaluate the effectiveness of nitrogenous fertilization in combination with nitrification inhibitors with or without iron application for maize crop in calcareous soil. Results revealed that at different growth stages the combination of ammonium sulfate with Nitraprin (N-serve) gave the highest dry weight as compared with other treatments and had a prominent effect on nitrogen uptake, iron and chlorophyll content. Application of potassium nitrate or ammonium
more » ... te or ammonium sulfate resulted in an increase in NO 3 accumulation. However, ammonium sulfate + N-serve dramatically decreased the accumulation of NO 3 in maize leaves. Results also indicated that, NO 3 concentration was higher at 60 DAS over 30 DAS (day after sowing) except when N-serve was applied. Nitrate accumulation in leaves was in the following order: ammonium sulfate + N-serve < ammonium sulfate < potassium nitrate. It was observed that iron content seemed to be affected by nitrogen sources. Using N-serve with ammonium sulfate reported higher values of ferrous, total and available iron in soil. At later stages of maize growth, the iron content increased due to application of ammonium sulfate as compared to potassium nitrate addition. Iron application generally increased N uptake, NO 3 content, chlorophyll and ferrous iron over a period of maize growth. The increment of nitrogen and iron uptake was associated with a predominant increase in chlorophyll content of maize leaves correcting the chlorosis symptoms appearing on maize in calcareous soil.