基于临界氮浓度稀释曲线模型的辣椒氮素营养诊断研究  

Studies on Nutritional Diagnosis of Capsaicin Nitrogen Based on Critical Nitrogen Concentration Dilution Curve Model

作　　者：肖蕊[1] XIAO Rui(Horticulture Department,Changzhi Vocational and Technical College,Changzhi,046011,Shanxi,China)

机构地区：[1]长治职业技术学院园艺系,山西长治046011

出　　处：《中国蔬菜》2023年第1期90-97,共8页China Vegetables

基　　金：山西省科技公关项目(20190311023-3)。

摘　　要：以贵州主栽辣椒品种辣研102、苏椒5号为试材,进行0、70、140、210、280 kg·hm^(-2)5个施氮水平的连续两年田间定位试验,根据植株地上部干质量和氮浓度的关系,构建辣椒临界氮浓度稀释曲线模型,并评价其在辣椒氮素营养诊断研究中的可行性。结果表明,随生育进程的推进,辣椒植株地上部氮浓度逐渐降低,干质量呈升高趋势,构建了2个辣椒品种统一的Nc曲线模型:N_(c)=4.39PDM^(-0.28),R^(2)为0.93。模型检验结果RMSE为0.26,n-RMSE为10.08%,且模拟值与实测值之间呈显著的线性关系,表明模型稳定性较好。基于Nc曲线推算的氮营养指数(NNI)随施氮量的提高而增加,不同年份、品种、施氮量和生育时期下NNI变化范围为0.55~1.30,且NNI与相对产量(RY)呈线性回归关系,相关性达到极显著水平。综合考虑辣椒产量及NNI,推荐贵州地区辣椒较适宜的施氮量为210 kg·hm^(-2)。This paper took Guizhou’s main chili varieties‘Layan 102’and‘Sujiao No.5’as test materials;conducted field positioning experiments at 5 nitrogen application levels of 0,70,140,210 and 280 kg·hm^(-2) for 2 consecutive years.According to the relationship between above-ground dry mass and nitrogen concentration,the paper established a critical pepper nitrogen concentration dilution curve model and evaluated its feasibility in diagnosis of nitrogen nutrition in pepper.The results showed that the above-ground nitrogen concentration in pepper plants decreased gradually as the fertility process advances,the dry weight on the rise.A unified Nc curve model for 2 pepper varieties was established:N_(c)=4.39PDM^(-0.28),R^(2) was 0.93.Model test result showed RMSE was 0.26 and n-RMSE was 10.08%.And there was a significant linear relationship between the simulated value and measured value,indicating model had a better stability.The nitrogen nutrition index(NNI)calculated based on Nc curve increased with the increase of nitrogen application quantity,and the variation range of NNI was 0.55-1.27 under different years,varieties,nitrogen application quantity and growth period.Even the correlation between NNI and relative yield(RY)was linear regression,reaching an extreme significant level.Comprehensive considering the pepper yield and NNI,210 kg·hm^(-2) was recommended as the suitable nitrogen application quantity for pepper in Guizhou region.

关 键 词：辣椒 临界氮浓度稀释曲线模型 氮营养指数 氮素诊断 

分 类 号：S641.3[农业科学—蔬菜学]