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以叶用黄甜菜为试材,采用水培方式,研究不同氮素形态及其配比对生长和品质的影响.结果表明:(1)叶用黄甜菜地上部和根系的生长对营养液中硝铵态氮配比(NO_3~--N∶NH_4~+-N)的需求不同,硝铵态氮配比≤1/2时,植株生长品质较好,硝铵态氮配比为4∶4和2∶6的处理较佳;营养液中的硝铵态氮配比≥1/2时,根系生长较好,硝铵态氮配比为6∶2和4∶4的处理较佳.(2)随着营养液中铵态氮比例的增大,植株的株高、茎粗、最大叶面积和生物量均呈先增后减的趋势,硝铵态氮配比为6∶2的处理较佳;各处理的硝酸盐含量均未超过无公害蔬菜标准;植株的可溶性糖、蛋白质和维生素C含量在硝铵态氮配比为4∶4和2∶6的处理下较佳.可见,叶用黄甜菜地上部与根系生长、地上部形态与品质均受到氮素形态及其配比的影响,且对硝铵态氮配比表现出不同的偏好.综合比较各项指标,铵态氮的比例不宜超过50%,硝铵态氮配比为6∶2和4∶4的营养液配方,可用于叶用黄甜菜的生产栽培.
The results showed that: (1) the growth of leaves and roots of yellow sugar beet in the medium of nutrient solution The demand of ammonium nitrate is different (NO_3 ~ --N:NH_4 ~ + -N). When the ratio of ammonium nitrate to nitrogen is less than 1/2, the growth quality of the plant is better. The ratio of ammonium to ammonium is 4: 4 and 2: 6, respectively. When the proportion of NH4 (superscript + subscript N) in the nutrient solution was more than 1/2, the root growth was better, and the ratio of NH4 + -N: 6: 2 and 4: 4 was better. (2) Plant height, stem diameter, maximum leaf area and biomass tended to increase first and then decrease with the increase of the proportion of ammonium nitrogen in the nutrient solution. The ratio of ammonium to ammonium was 6: 2 Treatment is better; the nitrate content of each treatment did not exceed the pollution-free vegetable standards; plant soluble sugar, protein and vitamin C content of ammonium nitrate nitrogen ratio of 4: 4 and 2: 6 treatment is better. , Leaf growth and root growth of yellow sugar beet, morphology and quality of aerial parts were affected by nitrogen forms and their ratio, and showed different preferences for the ratio of ammonium to ammonium.Comprehensive comparison of various indicators, ammonium Nitrogen ratio Not more than 50% ammonium nitrate nitrogen ratio of nutrient solution formula 6:2 and 4:4 can be used for the production of leaf yellow beet cultivation.