Effect of Fertilizer Type and Growth Periods in Nitrate Concenteration (Oxidation, Reduction and Rhizosphere) Layers in Rice Plant

Abstract

In order to study the effect of DAP fertilizer on Nitrate ion concentration during the different growth periods of the rice plant, the experiment was carried out in one of the rice fields located in Ghamas district / Diwaniyah governorate in the summer season of the year 2019 using the complete randomisation design (CRBD). The experiment included the use of DAP fertilizer (mineral DAP, organic DAP and high potash DAP). The seeds of the Jasmine variety were planted on 6/10/2019 and the 33 Anber variety on 6/15/2019 to study the effect of the type of fertilizer and the growth periods in the form of the Nitrate ion in the rhizosphere of the rice plant during the growth periods of the plant (45,75,105) days from planting. The results showed that the highest concentration of Nitrates for Anber rice 33 was achieved when organic DAP fertilizer (25.43) mg  kg^-1 in the oxidation layer during the period of time (75) days from planting, but during the two periods (45,105) days from planting, its concentration reached (24.00 and 22.70) mg kg^-1, respectively, which indicates that the place of production of nitrates is this layer and its spread from it to the rest of the layers. Its concentration decreased in the rhizosphere during the periods of time (45,75,105) days from planting. As for Jasmine rice, the highest concentration of Nitrates was achieved when organic DAP fertilizer was (25.03) mg kg^-1in the oxidation layer during the period (105) days from planting, and during the two periods (45,75) days from planting, its concentration reached (20.93,22.63) mg kg^-1 in relay. Its concentration decreased in the treatment of high-potash DAP (6.53,7.20,10.03) mg kg^-1  in the rhizosphere during the growth periods and it was the lowest in Nitrate processing compared to the rest of the types of DAP. The results also showed that the absorption of the Anber plant (its high concentrations) was less than the jasmine plant (its low concentrations) at the two periods (45,75) days from planting, then the opposite happened at the period (105) days of planting, and this is due to the different Nutritional requirements of the two plants.