摘要
为明确设施水培普通白菜最优施氮水平,以金品青松为试验材料,采用营养液膜技术(NFT),设置5个氮素水平〔1、5、10(CK)、20、40mmol·L^(-1)〕,研究不同施氮量对普通白菜生长指标、光合色素含量、全氮含量和叶绿素荧光参数的影响。结果表明:随着施氮量的增加,普通白菜叶片形态指标、生物量和全氮含量均大体上呈先升后降的变化趋势,光合色素含量和PSII有效光量子产量(F_(v)′/F_(m)′)大致呈先上升后下降再上升的变化趋势,PSII实际光化学效率(ΦPSII)和光化学淬灭系数(qP)则总体呈下降趋势,其中20mmol·L^(-1)氮素处理28d后,植株多数指标达到峰值,表明适度增施氮肥有效促进普通白菜叶片形态发育和光合作用,从而提高生物量的累积。通过构建回归方程,对产量与施氮量的关系进行拟合分析,确定设施水培条件下金品青松的最佳施氮量为21mmol·L^(-1),单株产量可达96.05g。
To determine the optimal nitrogen application level for hydroponic pakchoi under protected cultivation,the cultivar‘Jinpinqingsong’was used as the test material.The nutrient film technique(NFT)was adopted,and five nitrogen levels〔1,5,10(CK),20,40 mmol·L^(-1)〕were set to investigate the effects of different nitrogen application rates on growth indices,photosynthetic pigment contents,total nitrogen content,and chlorophyll fluorescence parameters of pakchoi.The results showed that with the increase in nitrogen application rate,the leaf morphological indices,biomass,and total nitrogen content generally exhibited a trend of first increasing and then decreasing.The contents of photosynthetic pigments and the effective quantum yield of PSⅡ(F_(v)′/F_(m)′)generally showed a trend of first increasing,then decreasing,and then increasing again.In contrast,the actual quantum efficiency of PSⅡ(ΦPSⅡ)and photochemical quenching coefficient(qP)generally presented a decreasing trend with increasing nitrogen application rate.Among all treatments,most indices reached their peaks after 28 days of treatment with 20 mmol·L^(-1)nitrogen,indicating that moderate increase in nitrogen application effectively promoted leaf morphological development and photosynthesis of pakchoi,thereby improving biomass accumulation.By constructing a regression equation to fit the relationship between yield and nitrogen application rate,the optimal nitrogen application level for‘Jinpinqingsong’under protected hydroponic conditions was determined to be 21 mmol·L^(-1),with the single plant yield reaching 96.05 g.
作者
郑聪慧
王涛
叶林梅
廖韶婷
吴仁烨
徐非凡
陈永快
ZHENG Conghui;WANG Tao;YE Linmei;LIAO Shaoting;WU Renye;XU Feifan;CHEN Yongkuai(Agricultural Digital Institute,Fujian Academy of Agriculture Sciences,Fuzhou 350003,Fujian,China;College of Agriculture,Fujian Agriculture&Forestry University,Fuzhou 350002,Fujian,China;Nanping Institute of Agricultural Sciences,Nanping 354200,Fujian,China)
出处
《中国蔬菜》
北大核心
2025年第12期116-125,共10页
China Vegetables
基金
福建省人民政府-中国农业科学院“5511”协同创新工程项目(XTCXGC2021015)。
关键词
普通白菜
施氮量
生长指标
叶绿素荧光特性
产量
pakchoi
nitrogen application rate
growth indices
chlorophyll fluorescence characteristics
yield
