新疆棉花早衰现象调查及其原因研究

来源 :新疆农业科学 | 被引量 : 0次 | 上传用户:zhanghaocong
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[目的]分析正常棉株与早衰棉株根系活力、营养状况及其土壤养分情况,明确新疆棉花发生早衰的原因,为防治棉花早衰提供理论依据.[方法]对早衰棉田进行田间调查、多点采集植株和土壤样品分析.[结果]相对于正常植株而言,重度早衰植株叶绿素含量(SPAD值)、根系活力分别降低53.3%和77.4%,植株吸收氮、磷、钾量分别降低2.8、2.1和1.1倍.早衰植株单株结铃数远低于正常植株,其产量仅为正常棉株产量的52.2%.[结论]根系活力下降使得棉花氮、磷、钾吸收量显著降低是导致棉花早衰、产量下降的主要原因之一.
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