2024, Vol. 7, Issue 4, Part F

author(s)
Nilotpal Hazarika, Karuna Kanta Sharma, Bipul Deka and Ghana Kanta Sarma

abstract
A field experiment was carried out at the Instructional-cum-Research (ICR) Farm, Assam Agricultural University, Jorhat. The experiment was laid out in split-plot design with three replications. The treatments consisted of five levels of irrigation in main plot viz., I₀: Rainfed, I₁: Irrigation at critical growth stages, I₂: Irrigation at IW: CPE ratio of 1.0, I₃: Irrigation at IW: CPE ratio of 1.2 and I₄: Irrigation at IW: CPE ratio of 1.4 along with four levels of N - N₀: 0 kg N/ha, N₁: 30 kg N/ha, N₂: 60kg N/ha and N₃: 90 kg N/ha in sub- plots. The soil of the experimental site was sandy loam in texture, acidic in reaction, medium in organic carbon, medium in available N, available P₂O₅ and low in available K₂O. The results revealed that higher values of nitrogen uptake was found in irrigation at IW: CPE ratio of 1.4. The treatment receiving nitrogen levels 90 kg/ha recorded higher values of nitrogen uptake. The effect of irrigation regimes on available N, P₂O₅ and K₂O content in soil were found to be non-significant after harvest of ryegrass. The available N content in soil was found significant due to the effect of nitrogen levels but available P₂O₅ and K₂O content in soil were found non-significant.