الفهرس | Only 14 pages are availabe for public view |
Abstract The present work aimed to study the effect ofN fertilizer material and its grain size, and the nitrification inhibitor nitrapyrin (NP) on growth, yield and nutrition of two crops grown on sandy soils. The effect of N fertilizer material and its grain size on the content of mineral N forms in soil percolate was also studied. The fertilizers used were ammonium sulfate (AS), calcium nitrate (eN). urea (UR) and ureaformaldchyde (UF). The fertilizer grain size was coarse ( C) > 2 mm or fine (F) < 2 m111.Thus. three experiments were conducted viz, leaching expo pot cxp with wheat and field expo using NP, with maize. The results are synopsized as follows: 1. In the leaching experiment, the NO’rN comprized 40 to 92% of the leachate total cumulated N species. The solubility of the used fertilizers followed the order: ASF > URr > i\SC > URC > UF > CNF > CNC. 2. Regarding the wheat grain and straw yields, UF and CNC treatments produced the highest values, respectively. However, the N fertilizer grain size was not significantly effective. The highest N recovery in wheat biological yield was found with CNC and URC treatments. |