CAJ | 학술논문

氮素添加对于紫花苜蓿生长具有重要作用。该试验研究了不同氮素添加水平对于紫花苜蓿生长性能各个指标的影响机制。结果表明，施氮对不同茬次苜蓿的株高、茎粗影响效果不明显，而对苜蓿的分枝数影响效果显著。每一茬次的苜蓿分枝数都随施氮量的增加而增加，并且处理之间差异显著（P＜0.05）；苜蓿单株地上生物量随施氮量的增加而增加，但从第一茬到第四茬，增加的趋势逐渐平缓。施氮对第一茬、第二茬和第四茬的苜蓿单株生物量有显著影响（P＜0.05），而对第三茬苜蓿单株生物量影响不显著；随着施氮量的增加，紫花苜蓿根系的总表面积、总体积、根颈粗和交叉数呈逐渐增加的趋势，而紫花苜蓿的总根长、平均直径和分叉数随施氮量的增加并未呈现逐渐增加的趋势，而是先增加后降低， N60处理的紫花苜蓿总根长、平均直径和分叉数最大。
담소첨가대우자화목숙생장구유중요작용。해시험연구료불동담소첨가수평대우자화목숙생장성능각개지표적영향궤제。결과표명，시담대불동치차목숙적주고、경조영향효과불명현，이대목숙적분지수영향효과현저。매일치차적목숙분지수도수시담량적증가이증가，병차처리지간차이현저（P＜0.05）；목숙단주지상생물량수시담량적증가이증가，단종제일치도제사치，증가적추세축점평완。시담대제일치、제이치화제사치적목숙단주생물량유현저영향（P＜0.05），이대제삼치목숙단주생물량영향불현저；수착시담량적증가，자화목숙근계적총표면적、총체적、근경조화교차수정축점증가적추세，이자화목숙적총근장、평균직경화분차수수시담량적증가병미정현축점증가적추세，이시선증가후강저， N60처리적자화목숙총근장、평균직경화분차수최대。
Nitrogen addition is rather important to the growth of alfalfa. ln this study, the effects of different nitrogen application levels on various growth characteristics of alfalfa were investigated. The results showed that nitrogen application exhibited no significant effects on plant height and stem diameter but posed significant effects on branch number of alfalfa. Branch number of alfalfa in each cutting raised with the increasing application level of nitrogen, with significant differences among different treatments (P<0.05); individual aboveground biomass increased with the increasing application level of nitrogen, but the increasing trend gradual y tended to be steady from the first to the fourth cutting. Nitrogen application affected significantly (P<0.05) individual aboveground biomass of alfalfa in the first, second and fourth cutting, but exhibited no significant effects on individual aboveground biomass of alfalfa in the third cutting. With the increase of nitrogen application level, total surface area, total volume, col ar diameter and crossing number of alfalfa roots increased gradual y, but total length, average diameter and furcating number of alfalfa roots increased first and then declined. Total length, average diameter and furcating number of alfalfa roots reached the maximum in N60 treatment.