饲用黑麦生物学特性及其产量营养动态变化

Biological characteristics of S.cereale and its yield and nutrition dynamics

针对棉花冬闲田,对饲用黑麦在不同生长阶段的生长速度、叶面积指数、干物质积累、根系重量和分布、可溶性糖含量以及产草量、营养成分含量进行了研究。结果表明,饲用黑麦的生长高度和干物质变化趋势基本一致,前期生长缓慢,随后增长迅速,干物质积累的快速增长阶段和高峰比生长速度的变化相对滞后。叶面积指数呈"S"型增长,并符合逻辑斯蒂模型。饲用黑麦的根系主要集中于土壤上层,茎基部含糖量始终高于根系中的含糖量,但两者变化趋势一致,前期含糖量较高,后期缓慢下降。随着饲用黑麦生育期延长,其产草量不断增加,质量不断下降。

The growing season of Secale cereale is from the end of October to the following April on the Huanghuaihai River Plain of China, which is when the land is idle during winter after cotton harvest. For Secale cereale during different stages of growth, growth rate, leaf area index, dry matter accumulation, root weight and distribution, soluble carbohydrate content, forage yield, and nutrient component content were studied. The trends of height growth and dry matter accumulation were essentially the same, where in the initial stage growth was slow but subsequently increased quickly, however the phase of fast increase in dry matter accumulation and its peak lagged behind the growth speed change. The leaf area index followed an 'S' curve increase, conforming to a logistic model. Roots were mainly distributed in the upper soil level. Stem base soluble carbohydrate content was consistently higher than that of the roots, but the change trends were the same, with quite high levels in the initial stage, and subsequently levels slowly reducing. With protraction of the growth and development period, forage yield increased but forage quality continually declined.