论文部分内容阅读
烟草(Ky-14)培养在含有3.0mMN 和0.1或1.0mMK~+营养液中5至9天。氮源为 NO_3~-或者按3∶1或1∶1配制的 NO_3~-与 NH_4~+的混合液,为了缩小 pH 的变化和补偿营养物质的消耗,逐日更换营养液。烟草在0.1mMK~+营养液中培养9天后,植株干物质普遍低于1.0mMK~+营养液中植株的干物重。在供 K~+量低并有 NH_4~+存在时,不会进一步降低干物质积累,供给高 K~+量及2.25mMNO~-_3与0.75mMNH_4~+时,干物质积累量最高,对不同形态氮源处理来说,高 K~+量时 NO_3~-的累积吸收大于低 K~+量时的累积吸收,NH_4~+的累积吸收不受钾的用量或 NO_3~-与 NH_4~+比例的影响。植物组织中阴阳离子间的比例也不大受影响,而 NO_3~-和 NH_4~+两者对植株含氮量的影响常常大于单供 NO_3~-的。上述结果表明,供给2.25mMNO_3~-与0.75mMNH_4~+的平衡氮源时,短期培养的烟苗干物质积累最高。
Tobacco (Ky-14) is cultured in medium containing 3.0 mM MN and 0.1 or 1.0 mM K + for 5 to 9 days. Nitrogen is NO_3 ~ - or 3: 1 or 1: 1 formulated NO_3 ~ - and NH_4 ~ + mixture, in order to reduce the pH changes and compensate for nutrient consumption, daily replacement of nutrient solution. After the tobacco plants were cultured in 0.1mMK ~ + nutrient for 9 days, the plant dry matter was generally lower than the dry weight of the plants in 1.0mMK ~ + nutrient solution. In the presence of K ~ + and NH_4 ~ +, the accumulation of dry matter would not be further reduced. When high K ~ + and 2.25mMNO ~ -_3 and 0.75mMNH_4 ~ + were supplied, The accumulation of NO_3 ~ - in high K ~ + was greater than that in low K ~ +, and the cumulative absorption of NH_4 ~ + was not affected by the amount of potassium or the ratio of NO_3 ~ to NH_4 ~ + Impact. The ratio of anions to cations in plant tissue was also not significantly affected. However, the effects of NO_3 ~ - and NH_4 ~ + on plant nitrogen content were often greater than that of NO_3 ~ - alone. The above results show that when supplying balanced nitrogen sources of 2.25mMNO_3 ~ - and 0.75mMNH_4 ~ +, the dry matter accumulation of short-term culture tobacco seedlings is the highest.