不同氮素水平下加工型辣椒干物质积累和氮吸收特性

Dry Matter Accumulation and Nitrogen Absorption Characteristics of Processed Pepper under Different Nitrogen Levels

为促进氮肥的合理利用,本研究采用基质培养法,营养液定量浇灌,分析了正常施氮量的60%、80%、90%、100%、120%和140%等6个氮素水平下加工型辣椒的干物质积累和氮素吸收特性。结果表明,随着施氮水平的提高,叶片干重、果实干重、茎干重、根干重和植株干重呈不断增加趋势,各部位氮含量在80%~100%施氮水平范围达到最大值,90%施氮水平下的叶片干重、根干重和果实干重,以及各部位氮含量和氮积累量都与100%、120%和140%氮素水平下无显著差异;相关性分析表明,氮积累量与叶片干重、茎干重、果实干重、根干重和植株干重相关性最高,而与氮含量相关性较小;不同氮素水平下植株氮含量的细微差异能够反映其营养状况,而干物质量的多少能够反映其氮积累量的多少。本研究可为加工型辣椒合理施用氮肥提供理论参考。

In order to promote the rational use of nitrogen fertilizer,the dry matter accumulation,nitrogen absorption of processed pepper were studied by substrate culture and quantitative irrigation of nutrient solution under 6 different nitrogen levels(60%,80%,90%,100%,120%and 140%of the normal N application).It showed that,with the increase of nitrogen application,the dry weight of leaf,dry weight of fruit,dry weight of stem,dry weight of root,and dry weight of plant were increasing;the nitrogen content of each part runs up to the maximum at 80%~100%nitrogen level;there was no significant difference between the dry weight of leaf,dry weigh of root,and dry weight of fruit,as well as nitrogen content and nitrogen accumulation of these parts at 90%,100%,120%and 140%nitrogen level.Correlation analysis showed that nitrogen accumulation showed the highest correlation with the dry weight of leaf,dry weight of stem,dry weight of fruit,dry weight of root,and dry weight of plant,but had little correlation with nitrogen content in each part.In addition,the slight difference in nitrogen content of plants at different nitrogen levels can reflect its nutritional status,while the amount of dry matter can reflect its amount of nitrogen accumulation.This study will provide theoretical reference for rational application of nitrogen fertilizer in processed pepper.