密氮互作对灌区胡麻籽粒产量及品质的影响

为明确适用于灌区胡麻高产优质生产的密度和氮肥施用量，以内亚9号为材料，于2017和2018年连续两 年进行田间试验，分析播种密度与氮对胡麻籽粒木酚素及脂肪酸组分含量及其产量的影响。播种密度分别为3.0× 106、6.0×106和9.0×106粒每公顷，现蕾前结合灌水进行的氮肥追施量分别为每公顷0、16、32和48 kg氮。结果表明： 在同一播种密度下，随施氮量增加，籽粒产量增加；在同一施氮情况下，随播种密度增加，籽粒产量提高。随氮肥增 加，油酸含量减少，亚油酸含量增加。随密度增加，亚麻酸含量也显著提高。方差分析结果表明，密度和氮对油酸 含量影响显著；密氮互作对木酚素含量影响显著。相关性结果显示，籽粒木酚素、亚油酸和亚麻酸含量两两显著正 相关。综合考虑增产增效和胡麻籽粒特殊品质，灌区种植胡麻的推荐播种密度为每公顷6.0×106粒，追施氮16 kg· hm-2。

Effect of seeding density and nitrogen rates on yield and quality of oilseed flax under irrigation

To investigate the effect of seeding density and nitrogen rates on flaxseed lignan, fatty acids and yields, field experiments were conducted in 2017 and 2018 at irrigated area in China. Oil flax cultivar Neiya 9 was planted with 3 seeding rates(3.0×10⁶, 6.0×10⁶ and 9.0×10⁶)and 4 nitrogen rates(0, 16, 32, 48 kg·hm^-2)during the budding stage with irrigation. Results indicated that yield increased significantly with the nitrogen rate under the same seeding rate. It also increased with the seeding rate under the same nitrogen rate. Oleic acid decreased and linoleic acid increased with the nitrogen rate, while linolenic acid increased with the seeding rate. Seeding rate and nitrogen rate had significant influence on oleic acid. Variance analysis results showed that interaction of seeding density and nitrogen rate had significant effect on both lignan content and oleic acid content. By correlation analysis, significant positive correlation was observed between lignan and linoleic, and also between lignan and linolenic contents. To improve yields and efficiencies of linseed oil, seeding rate as 6.0×10⁶ per hectar and 16 kg·hm^-2 nitrogen rate were recommended under the planting areas with similar irrigated conditions.