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以黑龙江主栽黄瓜品种“津春3号”为试材,采用盆钵培养的方法,研究了营养液中不同NO3--N与NH4+-N配比对黄瓜幼苗生长及氮、磷养分吸收的影响。结果表明:沙培条件下,营养液中氮的总浓度为15mmoL/L时,随着营养液中NH4+比例的增加,幼苗长势随之变弱;全NO3--N处理的幼苗叶面积、干重及壮苗指数分别是全NH4+-N处理的1.92、2.12与3.07倍;氮形态对幼苗地上部全氮含量与硝酸还原酶活性无显著影响,而对幼苗地上部全磷含量影响显著,全NO3--N处理的幼苗磷含量显著高于全NH4+-N处理,为全NH4+-N处理的2倍;受NH3毒害,全NH4+-N处理的幼苗根系活力显著下降,地上部游离氨基酸含量显著上升。全NO3-处理对黄瓜幼苗生长最有利。
Taking cucumber variety “Jinchun No.3 ” as main material in Heilongjiang Province as test material, the growth of potted seedlings and the nutrient contents of nitrogen and phosphorus in nutrient solution with different ratios of NO3 - N and NH4 + -N in nutrient solution were studied. Absorption effects. The results showed that under the condition of sand culture, the total nitrogen concentration in the nutrient solution was 15 mmoL / L, the seedling growth became weaker with the increase of the NH4 + proportion in the nutrient solution. The leaf area of the whole NO3 - N seedling was Heavy and strong seedling index were 1.92, 2.12 and 3.07 times that of the whole NH4 + -N treatment, respectively. There was no significant effect of nitrogen forms on the total nitrogen content and nitrate reductase activity of aboveground parts of seedlings, The phosphorus content of seedlings treated with NO3 - N was significantly higher than that of the whole NH4 + -N treatment and twice as that of the whole NH4 + -N treatment. The root activity of seedlings treated with NH4 + -N was significantly decreased and the content of free amino acids in shoots significantly increased rise. Full NO3-treatment is most beneficial to cucumber seedling growth.