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为探究在灌输条件相同的情况下,不同生长年限(1、3、5、7 a和10 a)对紫花苜蓿产量及土壤养分的影响。通过选取不同年份的紫花苜蓿,观察并记录其产量及土壤养分,结果表明,随着生长年限的增加,紫花苜蓿的产量呈现先增加后降低的趋势,土壤养分也在此阶段达到最高值后急剧下降;与其他年限的紫花苜蓿比较,七年生的紫花苜蓿产量最高,差异显著(P<0.05)。
To investigate the effects of different growing years (1, 3, 5, 7 a and 10 a) on alfalfa yield and soil nutrient under the same irrigation conditions. By selecting the alfalfa in different years, the yield and the soil nutrient were observed and recorded. The results showed that the yield of alfalfa increased at first and then decreased with the increasing of the growing years, and the soil nutrient also sharply reached the peak at this stage Compared with other years of alfalfa, the yield of seven-year-old alfalfa was the highest (P <0.05).