木薯氮素营养状况的SPAD仪诊断木薯氮素营养状况的SPAD仪诊断.doc

PAGE  PAGE 6 - - 木薯氮素营养状况的SPAD仪诊断 柳红娟1收稿日期：2012-06-10 基金项目：现代农业产业技术体系建设专项资金资助（CARS-12-hnhj） 作者介绍：柳红娟（1989-），性别，甘肃兰州人，硕士研究生,所从事的研究或研究方向。*为通迅作者：刘子凡:(1975～)，江西余干人，博士，副教授，主要从事作物生理生态研究，E-mail：jiangxilaobiao@163.com。 ，欧燕楠1，刘子凡1*，黄 洁2 (1.中国热带农业科学院热带作物品种资源研究所， 海南 儋州 571737；2.海南大学农学院，海南 海口 570228) 摘 要：本文以华南8号为材料，研究了不同生育时期木薯叶片SPAD值、鲜薯产量以及淀粉产量随土壤供氮水平的变化规律及其相互关系。结果表明:①在块根形成期和块根膨大期，叶片SPAD值随土壤施氮量表现为线性加平台的模式，而在块根工艺成熟期仅表现为线性模式。②不管是在块根形成期、块根膨大期和块根工艺成熟期，木薯叶片SPAD值与块根鲜薯产量和淀粉产量之间均呈现二次函数关系，据此确定了在块根形成期、块根膨大期和块根工艺成熟期应用叶绿素仪SPAD-502进行木薯推荐施肥的的SPAD临界值：鲜薯产量最大时分别为45.19、43.09、40.63，淀粉产量最大分别为44.31、42.49、40.51。③若在块根形成期、块根膨大期和块根工艺成熟期观测SPAD值小于临界SPAD一个单位，且施氮量小于1.98 kg/667m2时，则应增加的施氮量分别为0.42、0.63和1.34 kg/667m2；若施氮量大于1.98 kg/667m2，追氮量则需进一步研究。 关键词：木薯；SPAD值；氮素营养诊断 中图分类号： 文献标识码：A Diagnosis of Cassava Nitrogen Nutrition Status by Use of Chlorophyll Meter SPAD-502 LIU Hong-juan1, OU Yan-nan1, LIU Zi-fan1, Huang Jie2 (1.College of Agriculture, Hainan University, Hainan Haikou 570228,China; 2.Tropical Crops Genetic Resources Institute, CATAS, Hainan Danzhou 571737, China) Abstract: In this paper, taken the cassava variety of SC8 as tested materials, the change of cassava leaf SPAD value, fresh cassava yield and starch yield during different growing period were studied with nitrogen supply. The results showed that (i)at the root initiation stage and the root bulking stage, the leaf SPAD value varied with nitrogen fertilization levels in linear-plateau regression modes, and in linear regression modes at the root technical maturity stage.(ii) Fresh cassava yield and starch yield varied with the leaf SPAD value in a quadratic-function modes at root initiation stage, root bulking stage and the root technical maturity stage, threshold SPAD values of different growth stages of cassava were obtained, which were critical for the instruction of nitrogen fertilization in cassava by SPAD-502. when fresh cassava yield was the highest,SPAD values were 45.19,43.09,40.63,respectively; when starch y