ABSTRACT
OPTIMIZATION OF THE NITROGEN FERTILIZATION BY MIXED LIQUID AMMONIA IN SANDY SOIL TO ENHANCE THE YIELD AND QUALITY OF THE SESAME CROP
Journal: Plant Physiology and Soil Chemistry
Yasser M. EL-Edfawy, Mohamed S. Mohamed, Rama T. Rashad
This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
DOI: 10.26480/ppsc.02.2024.75.84
This study aims to optimize the nitrogen (N) fertilization in sandy soil using the aqua NH3 mixed solutions as an economic N-fertilizer compared to the ammonium sulphate fertilizer as a control (CL). The Sesame (Sesamum indicum L.) crop was cultivated in the two field experiments through the summer seasons of 2022 – 2023 under sandy soil conditions and closed drip irrigation system. The main factor (F1) was two application rates of the N fertilization 100% and 75% of the recommended dose RD. The sub-factor (F2) was two dilution levels D1 (1:5 v/v) and D2 (1:2.5 v/v) of the aqueous solution. The sub sub-factor (F3) was five types of materials mixed with the liquid ammonia: water (H2O) – sulphuric acid solution (0.2 N H2SO4) – phosphoric acid solution (0.2 N H3PO4) – humic substances (from K-humate salt solution 0.5%) -suspended bentonite clay in H2O 20% solid/liquid ratio. Treatments were distributed in a split-split plot design. On the
lab scale, the N (%) remained in the mixed NH3 aqueous solution was decreased with increasing the time (h) of residence due to the evolution of the NH3 gas. On the field scale, the different aqua NH3 treatments has significantly affected the soil available N (mg kg-1)estimated at field capacity FC moisture point. The sesame seed yield (Mg ha-1) has significantly increased by 10.0, 5.0, and 3.75%, by application of 75% RD aqua NH3 mixed with the H3PO4, H2SO4, and humate, respectively, that were diluted by 1:2.5 D2 ratio compared to the CL maximum value at the significance level P≤0.05. The NH3/H3PO4 aqueous mixture has showed the most significant increase in the N-uptake by seeds for both the 75 and 100% RD by 1.52 and 3.9%, respectively. Following it, the same rates from the NH3/H2SO4 mixture has showed significant increases by 2.7 and 2.8%. The NH3/humate mixture has also increased the N-uptake by 1.4% at its 100% RD-D2 application rate. The P-uptake and K-uptake by seeds were also significantly increased. The diluted aqua NH3 mixed solutions can be recommended as efficient and economic N fertilizer in sandy soil.
lab scale, the N (%) remained in the mixed NH3 aqueous solution was decreased with increasing the time (h) of residence due to the evolution of the NH3 gas. On the field scale, the different aqua NH3 treatments has significantly affected the soil available N (mg kg-1)estimated at field capacity FC moisture point. The sesame seed yield (Mg ha-1) has significantly increased by 10.0, 5.0, and 3.75%, by application of 75% RD aqua NH3 mixed with the H3PO4, H2SO4, and humate, respectively, that were diluted by 1:2.5 D2 ratio compared to the CL maximum value at the significance level P≤0.05. The NH3/H3PO4 aqueous mixture has showed the most significant increase in the N-uptake by seeds for both the 75 and 100% RD by 1.52 and 3.9%, respectively. Following it, the same rates from the NH3/H2SO4 mixture has showed significant increases by 2.7 and 2.8%. The NH3/humate mixture has also increased the N-uptake by 1.4% at its 100% RD-D2 application rate. The P-uptake and K-uptake by seeds were also significantly increased. The diluted aqua NH3 mixed solutions can be recommended as efficient and economic N fertilizer in sandy soil.
| Pages | 75-84 |
| Year | 2024 |
| Issue | 2 |
| Volume | 4 |
