半干旱地区旱地苜蓿合理群体结构研究

Study on Rational Construction of Alfalfa Groups at Dryland in Half-drought Area

应用多元回归和相关分析的方法,揭示半干旱区旱地苜蓿鲜草产量与分枝数、株高相互影响及变化的规律。研究结果表明,苜蓿鲜草产量与分枝数、株高有真实的回归关系,并呈正相关;欲使1hm2鲜草产量达到84t以上,分枝数应在580万条以上,株高不低于70cm;当1hm2鲜草产量保持70t平均水平时,分枝数与株高呈负相关,但并不显著,同时增加分枝数和株高来增加产草量存在一定的风险。在栽培管理措施上,应及时调控分枝数与株高,使二者保持在协调合理的范围之内。

With application of multielement recurrence and correlation analysis,its aim was to reveal the effect and changeable regularity among fresh alfalfa yield,branches and the strain height in half-drought area. The result showed that fresh alfalfa yield was correlated to the branches,if fresh alfalfa yield of 1 hm2 reaches 84 tons,the condition,above 5.8 million brances and no less than 70 cm in height,should be needed,if fresh alfalfa yield of 1 hm2 is 70 tons on averge,the branches is negatively correlated to its height,but it isn′t marked,thus it exists the risk by increasing branches and the height to abtain the yield. It should control branches and its height in administration measure in time to keep them in the reasonable range.