晋北地区饲草燕麦生长动态及最佳收割期研究

对饲草燕麦不同生育期的株高、鲜草产量、干草产量、营养成分以及饲料相对值进行了研究。结果表明：在晋北旱作条件下,饲草燕麦从孕穗期到蜡熟期株高增长符合Logistic生长模型。鲜干比、茎叶比、干草产量变化符合一元线性回归模型,孕穗期最低,蜡熟期最高。鲜草产量乳熟期达到最高,为33777.78㎏/hm&;amp;lt;sub&;amp;gt;2&;amp;lt;/sub&;amp;gt;。干草产量从孕穗期持续增加,蜡熟期达到最高,为10184.71㎏/hm&;amp;lt;sub&;amp;gt;2&;amp;lt;/sub&;amp;gt;。干物质中粗蛋白质含量开花期最高,为10.00%,蜡熟期最低,为7.07%。饲料相对值(RFV)乳熟期最高,为95.85,蜡熟期次之,为86.03。综合分析结果表明,在晋北地区旱作条件下,饲草燕麦在调制青贮饲料时应在开花期至乳熟期收割；调制干草时应在乳熟期至蜡熟期收割。

Growth Dynamics and Optimum Harvest Periodof Forage grass oats in the northern Shanxi

To understand the growth regularity and confirm the best harvest time of Forage grass oats, its plant height, fresh and dry matter accumulation and distribution during different stages in a field experiment were investigated, its nutrient values and relative value of feed were studied. The height of forage oat from booting stage to waxy stage was consistent with Logistic growth model ,under dry farming condtions. The changes of fresh dry ratio, stem/leaf ratio and hay yield were consistent with the linear regression model with the lowest booting stage and the highest waxy stage. Reached the highest grass yield of the ratooning buds of 33777.78 ㎏/hm2.Hay yield increased continuously from booting stage, reached the highest waxy stage is 10184.71 ㎏/hm2. Crude protein content in dry matter was the highest at flowering stage, 10.00%, and the lowest at waxing stage, 7.07%. The relative value of feed (RFV) was the highest in the ratooning buds, which was 95.85, followed by waxy stage, which was 86.03. It is suggested that under the condition of dry farming in northern Shanxi, forage grass oats should be harvested from flowering stage to ratooning buds when preparing silage, hay should be harvested from ratooning buds to waxy stage.