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分析了2年生紫花苜蓿的生长发育规律、地上生长量、地下生长量及气象要素对紫花苜蓿生长发育的影响。结果表明:紫花苜蓿在陇东地区种植气候适应性较好,鲜干比高,适宜青饲。由于初秋热量条件限制,陇东塬区2年生陇东紫花苜蓿第三茬分枝后便停止生长,每茬全生育期需要≥0℃积温约1 100℃~1 150℃;其中萌芽~分枝期春季约280℃,夏季约330℃;分枝~现蕾期460℃左右;现蕾~开花期360℃左右,从第一茬到第三茬,产草量和植株高度依次降低,但分枝数依次增多,显蕾期前后是产量形成的关键时期。
The growth and development of alfalfa in two years were analyzed. The effects of aboveground biomass, underground growth and meteorological factors on the growth and development of alfalfa were analyzed. The results showed that: alfalfa cultivated in Longdong region climate adaptability is better, fresh and dry than high, suitable for green feeding. Due to the limitation of early autumnal heat conditions, the 2-year-old Longdong alfalfa in Longdong Plain stopped its growth after the third cropping. The whole growing period required ≥0 ℃ accumulated temperature of about 1 100 ℃ ~ 1 150 ℃. The germination ~ branching About 280 ℃ in spring and about 330 ℃ in summer; about 460 ℃ in branching-budding; about 360 ℃ in budding-flowering. From the first crop to the third crop, the grass yield and plant height decreased in turn, The number of branches increased in turn, the significant bud period is the key period of yield formation.