施肥量与施肥频率对紫花苜蓿茎秆直径及长度的影响

为了探究科尔沁沙地苜蓿种植过程中,肥料对苜蓿茎秆长度和茎秆直径影响,试验通过设置不同施肥量与施肥频率,论述了苜蓿茎秆直径与茎秆长度的变化规律,进而反映出苜蓿的生长状况,为紫花苜蓿施肥提供了理论基础。结果表明,增加施肥量能够促进第一茬紫花苜蓿茎秆的伸长生长,当施肥量过高时会抑制其生长;第二茬苜蓿在施肥量为50～70 kg/667 m2时,增加施肥频率对茎秆长度无明显影响;3茬苜蓿茎秆长度平均值大小为第二茬〉第一茬〉第三茬,茎秆直径平均值为第一茬〉第二茬〉第三茬,茎秆长粗比的平均值分别为186.68、291.70、298.80;3茬苜蓿茎秆直径的波动范围分别为2.92～3.99 mm、2.47～3.13 mm、1.52～2.28 mm;紫花苜蓿茎秆直径与茎秆长度之间存在显著线性相关。

Effects of Fertilizer Amount and Fertilization Frequency on Stem Diameter and Length of Alfalfa

The objective of this study was to explore the effect of fertilizer application on the stem length and diameter of alfalfa planting in Horqin Sandy Land. To reveal the variation law of stem diameter and length of alfalfa, demonstrate the growth status of alfalfa and provide theoretical basis for fertilizer application in alfalfa planting, a field trial was conducted by setting different fertilizer amount and fertilization frequency. The results showed that the increased amount of fertilizer promoted the elongation growth of stem of the first-cut alfalfa, while its growth was inhibited by excessive fertilizer use. The increased fertilization frequency had no obvious effect on stem length of the second-cut alfalfa when the fertilizer amount ranged from 50 to 70 kg/667 m2. The average value of stem length and diameter of the three cuts of alfalfa was the second-cut 〉 the first-cut 〉 the third-cut and the first-cut 〉 the second-cut 〉 the third-cut, respectively, and the average value of stem length to diameter ratio of the three cuts of alfalfa was 186.68, 291.70 and 298.80, respectively. The fluctuation range of the stem diameter of the three cuts of alfalfa was 2.92-3.99 mm, 2.47-3.13 mm, 1.52-2.28 mm, respectively. There was a significant linear correlation between stem diameter and length.