为探究建植密度和施氮对老芒麦种子生产的影响,本试验以新疆农业大学老芒麦品系DJ-01为试验材料,通过裂区试验设计,设置密度处理2个:高密度(715 200株/hm²)、低密度(25 8700株/hm²),下设5个不同施氮水平:0 kg/hm²、30 kg/hm²、60 kg/hm²、90 kg/hm²、120 kg/hm²,共计10个处理,每个处理三次重复。结果表明,建植密度和施氮水平对老芒麦种子生产株高、茎粗及种子产量构成因子指标具有显著影响;低密度处理较高密度可获得较高的种子产量,同一密度条件下单位面积生殖枝数、每生殖枝小穗数、每小穗小花数、每小穗种子数及千粒重等种子产量构成因子指标表现为随施氮量增加呈现先增加后降低趋势;施氮显著提高老芒麦种子产量,在90 kg/hm²施氮水平下老芒麦种子产量最佳。综合分析表明在试验区适宜老芒麦种子生产的条件为建植密度258 700株/hm²,施氮水平90 kg/hm²。

In order to explore the effects of planting density and nitrogen application on the seed production of Elymus sibiricus, taking Elymus sibiricus strain DJ-01 of Xinjiang Agricultural University as the experimental materials, through split-plot experiment design, two density treatments were set: high density(715,200 plants·hm^-2) and low density(258,700 plants·hm^-2), with five different nitrogen application levels: 0 kg·hm^-2, 30 kg·hm^-2, 60 kg·hm^-2, 90 kg·hm^-2 and 120 kg·hm^-2, totaling 10 treatments, each treatment being repeated three times. The results showed that planting density and nitrogen application level had significant effects on plant height, stem diameter and seed yield components of Elymus sibiricus seed production. High seed yield could be obtained by low density treatment compared to high density treatment. Under the same density condition, seed yield component indexes such as number of reproductive branches per unit area,number of spikelets per reproductive branch, number of florets per spikelet, number of seeds per spikelet and1000-grain weight showed a trend of increasing at first and then decreasing with the increase of nitrogen application rate. Nitrogen application significantly increased the seed yield of Elymus sibiricus, and the seed yield of Elymus sibiricus was the best at 90 kg·hm^-2 nitrogen application level. Comprehensive analysis showed that the suitable conditions for seed production of Elymus sibiricus in the experimental area were the planting density of 258,700 plants·hm^-2 and nitrogen application level of 90 kg·hm^-2.