Abstract:

In order to determine the ideal seeding density and nitrogen fertilizer application rate for various purposes of cultivating ‘Baodamai 25’, and to provide a solid scientific foundation for widespread demonstrations and promotion, we conducted a two-factor interaction experiment with seeding density and nitrogen application as the variables, each with three levels, resulting in nine different treatments. The findings revealed that as nitrogen application and seeding density increased, fresh grass yield also increased. The grain yield increased with higher seeding density, but it began to decline after reaching the peak nitrogen application rate of 525 kg/hm² of urea. For optimizing fresh grass yield, the most suitable seeding density was found to be 3×10⁶ plants/hm², with the best nitrogen application rate being 675 kg/hm² of urea. For grain harvest, the optimal seeding density was 2.4×10⁶ plants/hm², and the ideal nitrogen application rate was 52 kg/hm² of urea. In the same treatment, after deducting the cost of seeds and nitrogen fertilizer, harvesting fresh grass proved to be more economically beneficial compared to harvesting grain, with a range of additional economic benefits of 810 to 4540.8 yuan/hm².

Key words: barley, nitrogen fertilizer, density, fresh grass yield, grain yield, economic benefit