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用~(15)N同位素稀释法,于1985～1988年在盆栽和草场小区条件下,研究了新疆大叶苜蓿和其它新疆主要豆科牧草及新疆主要禾本科牧草在单播和混播系统中的氮行为。新疆大叶苜蓿、覃木樨、红豆草、白三叶和红三叶等新疆主要豆科牧草植株对肥料氮的要求是微不足道的,仅占0.7％～5.3％,但对土壤和空气氮的依赖性则差异很大。总的趋势是豆科牧草对土壤或肥料氮的依赖性随着固氮能力的增强而降低。新疆大叶苜蓿植株中有79％的氮来自空气,是高固氮作物,肥料氮仅占0.7％。在混播系统中,新疆主要禾本科牧草牛尾草、老芒麦、冰草和无芒雀麦植株来自肥料和土壤氮的比例比单播时都有较大的降低,发生了苜蓿固氮产物向与之混作的禾本科牧草转移。新疆大叶苜蓿与老芒麦1:1混播,为合适组合。合适组合的混合干草产量,产氮量,苜蓿固氮量及向老芒麦转移量都最优。混合干草中苜蓿与老芒麦的组成重量比为1:0.9,搭配合理,营养完全。
By using (15) N isotope dilution method, under the condition of potted and grassland plots from 1985 to 1988, the effects of large-leaved alfalfa (Medicago sativa) in Xinjiang and other major leguminous species in Xinjiang and grassland grasses in Xinjiang Nitrogen behavior. The main legume forage plants in Xinjiang, such as Medicago sativa, Fagus, tangerine, white clover and red clover, are negligible for fertilizer nitrogen, accounting for only 0.7% to 5.3% of the total, but are dependent on soil and air nitrogen Sex is very different. The general trend is that the dependence of legumes on soil or fertilizer nitrogen decreases with increasing nitrogen fixation. In Xinjiang, 79% of the total nitrogen of alfalfa plants comes from the air and is a high-nitrogen-fixing crop with only 0.7% of fertilizer nitrogen. In the mixed-sowing system, the proportions of nitrogen from fertilizers and soil nitrogen in the main gramineous herbage, Siberian oyster, Siberian rosegrass and Bromus inermis in Xinjiang were significantly lower than those in unicceded, and the ratio of nitrogen fixation products from alfalfa to The mixture of grasses pasture transfer. Xinjiang big leaf alfalfa and old mulberry 1: 1 mixed broadcast, a suitable combination. The optimum combination of hay yield, nitrogen yield, nitrogen fixation of alfalfa and the amount of transfer to Elymus sanguinea was optimal. Mixed hay alfalfa and Emerald composition weight ratio of 1: 0.9, with a reasonable, nutritionally complete.