Estimation of Optimum N Fertilizer and Sowing Rate for Italian Ryegrass Seed Production in the Saemangeum Reclaimed Land
2021
Bae, H.S. | Jang, H.S. | Ahn, S.H. | Kim, U.H. | Youn, J.T. | Chung, D.Y.
Italian ryegrass (Lolium multiflorum Lam.) was cultivated in a field experiment, on sandy loam soil of the Saemangeum reclaimed land, under different sowing rates and N fertilizer levels to estimate the optimum N fertilizer requirement and the most suitable sowing rate for seed production. The experiment was conducted in a split-plot design with four replications. The main-plots were four sowing rates of 10, 20, 30, and 40 kg ha⁻¹ and sub-plots were five N fertilizer application rates of 0, 45, 90, 135, and 180 kg ha⁻¹. Harvest index decreased with increasing sowing and N fertilizer rate. The highest N use efficiency was obtained at 10 kg ha⁻¹ sowing rate and 45 - 90 kg ha⁻¹ N fertilizer application rates. Maximum seed yield of Italian ryegrass based on the regression curve of N fertilizer application level was 102 kg ha⁻¹ and was decreased with further N application. Economically, optimum rates of N application ranged from 70 to 101 kg ha⁻¹ depending on the sowing rate. Results from this experiment, could therefore inform producers of the best combination of sowing and N fertilizer rates needed to increase profitability of Italian ryegrass seed production alongside preventing N loss. However, further research will be necessary to elucidate on increasing seed quality and stability of cultivation under various environmental conditions.
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