摘要
试验旨在探究同一生育期种植密度对青贮玉米生长的影响和相同密度下不同青贮玉米的生长差异,为榆林风沙草滩区种植青贮玉米提供参考。研究以5个青贮玉米品种为材料,设置6.75×10^(4)株/hm^(2)(M1)和8.25×10^(4)株/hm^(2)(M2)2个种植密度,系统分析其光合特性、农艺性状及营养品质的差异。结果显示,榆青21在M1密度下表现较优,其乳熟末期最大光化学效率(Fv/Fm)为0.74,干草产量为20716.67 kg/hm^(2),粗蛋白含量达6.92%,均高于其他品种,实际光化学效率[Y(Ⅱ)]仅低于京科青贮932。中农大787在M2密度下淀粉含量最高,相对饲喂价值(RFV)最高,为高饲喂价值品种。密度响应表现出显著品种特异性,京九青贮16通过提升Fv/Fm和Y(Ⅱ)适应M2密度胁迫。中农大787在M2密度下光合参数下降,Fv/Fm为0.67,Y(Ⅱ)为0.50。榆青21在M2密度下乳熟末期茎粗较粗,绿叶数较多。研究表明,榆林风沙草滩区推广在M2密度下种植中农大787可兼顾高产与高RFV,需高蛋白青贮时可优先选择M1密度下种植榆青21。
The study aimed to investigate the impact of planting density on silage corn growth during the same reproductive stage and the growth differences of different silage corn under identical densities,providing guidance for silage corn cultivation in Yulin's sandy grassland regions.The study used five silage corn varieties as materials and set two planting densities of 6.75×10^(4)plants/hm^(2)(M1)and 8.25×10^(4)plants/hm^(2)(M2),with systematic analysis of differences in photosynthetic characteristics,agronomic traits,and nutritional quality.The results showed that Yuqing 21 performed better at M1 density,with higher maximum photochemical efficiency(Fv/Fm)of 0.74,hay yield of 20716.67 kg/hm^(2),and crude protein content reached 6.92%,both higher than that of other varieties.The actual photochemical efficiency[Y(Ⅱ)]was only lower than that of Jingke Silage 932.Zhongnongda 787 at M2 density achieved the highest starch content and relative feed value(RFV),identifying it as a high-nutrition variety.Density responses demonstrated significant variety specificity,Jingjiu Silage 16 adapted to M2 density stress by increasing Fv/Fm and Y(Ⅱ),whereas Zhongnongda 787 showed photosynthetic decline at M2,Fv/Fm of 0.67 and Y(Ⅱ)of 0.50.Yuqing 21 had a higher stem thickness and more green leaves at M2 during the late milk stage.The study indicates that promoting the planting of Zhongnongda 787 under M2 density in Yulin's sandy grassland regions can achieve both high yield and high RFV.When high protein silage is needed,priority should be given to planting Yuqing 21 under M1 density.
作者
郭志园
刘子翮
史雷
张彩平
任波
徐伟洲
卜耀军
GUO Zhiyuan;LIU Zihe;SHI Lei;ZHANG Caiping;REN Bo;XU Weizhou;BU Yaojun
出处
《饲料研究》
北大核心
2025年第14期145-150,共6页
Feed Research
基金
陕西省科技计划项目(项目编号:2024NC-YBXM-084、2024CX-GXPT-31、2024QCY-KXJ-101)。
关键词
青贮玉米
种植密度
光合特性
营养品质
品种筛选
silage corn
planting density
photosynthetic characteristics
nutritional quality
variety screening
