摘要：本实验以萱草为实验材料，以萱草发病叶率、病叶指数等指标为标志，研究不同肥料不同配比对萱草叶枯病的影响，探讨肥料于萱草叶枯病的发生关系。试验结果表明同肥料配比对萱草叶枯病病叶率与病情指数存在显著影响。10kg/66.7m2K肥条件下，叶枯病病叶率与病情指数均显著高于其它K水平。不施氮处理，病叶率显著高于施氮处理，而病情指数则低于施氮处理。当K 、N、P配比为0：0：6kg/666.7m2时，萱草叶病叶率最低，为32.97%，当K、N、P配比为10：20：0 kg/666.7m2时，萱草病叶率最高，为82.20%。当K、N、P比例为5：0：6 kg/666.7m2时，萱草叶枯病病情指数最低，为9.37。当K、N、P比例为10：20：0 kg/666.7m2时，萱草叶枯病病情指数最高，为22.93。58070

毕业论文关键词：肥料；萱草；病叶率；病情指数；氮肥；磷肥；钾肥；

Effect of the application of the  fertilizers on the daylily   leaf streak of Hemerocallis 

Abstract:This experiment in Hemerocallis as experimental material, in Hemerocallis incidence rate, leaf disease index index, effects of different fertilizer different ratio of leaf blight of Xuan influence. Effect of Fertilization on leaf blight of Xuan relationship. The test results show that the same proportion of fertilizer on Xuan grass blight rate and disease index significantly affected. Under the condition  of 10kg/66.7m2K fertilizer, leaf blight rate and disease index were significantly higher than other K levels. Without nitrogen treatment, the rate of diseased leaves was significantly higher than that of nitrogen treatment, while the disease index was lower than that of nitrogen application. When k, ratios of N and P is 0:0:6kg/666.7m2, lily leaf disease leaves was the lowest, 32.97%, when k, ratios of N and P is 10:20:0 kg / 666.7m2, the leaves of Lily disease rate was highest, being 82.20%. When K, N, P ratio was 5:0:6, a leaf blight disease index is the lowest, 9.37. When K, N, P, 10:20:0 ratio, leaf blight disease index of Hemerocallis is highest, 22.93.

Keywords：Fertilizer; Hemerocallis; diseased leaves rates; disease index; nitrogen; phosphate; potassium;

目录

1 绪论

1.1 萱草的生态学特征及观赏价值

1.2 萱草叶枯病简介

    1.2.1 萱草叶枯病防治

1.3 肥料简介

  1.3.1 氮肥

     1.3.1.1 氮不足一般表现

     1.3.1.2 氮过量一般表现

    1.3.2 磷肥

 1.3.2.1 磷肥对作物生长的作用

     1.3.2.2 植物缺磷症状

1.3.3 钾肥

 1.3.3.1 钾肥对植物的作用

2 材料与方法

 2.1 供试萱草、肥料

 2.2 试验设计

  2.2.1 萱草种植

2.2.2 试验方法

  2.2.2.1 肥料配比

  2.2.2.2 肥料施用

  2.3 病叶率与病情指数调查

2.3.1 病情分级

2.3.2 病叶率调查及计算方法

  2.4 数据处理

3 结果与分析

 3.1  N、P、K肥不同配比对萱草叶枯病病叶率影响       

 3.2  N、P、K肥不同配比对萱草叶枯病病情指数影响  

4 讨论

致谢

参考文献