不同氮肥及用量对潍县青萝卜肉质根叶绿素含量的影响

Effect of Different Nitrogen Fertilizers and Dosages on Chlorophyll Content in Fleshy Roots of Green Radish Produced in Wei County

以潍县青萝卜为试材,研究磷酸氢二铵、硝酸铵、硫酸铵和尿素4种氮肥的4种施用量(125、250、375、500kg·hm^(-2))对潍县青萝卜肉质根叶绿素含量的影响。结果表明:叶绿素含量在肉质根生长前期、中期、后期呈下降趋势,且不受肥料种类及用量的影响。不同氮肥种类和用量对潍县青萝卜肉质根叶绿素含量的影响不同,其中硝酸铵的影响最小;375 kg·hm^(-2)磷酸氢二铵和125、250 kg·hm^(-2)硫酸铵有利于韧皮部叶绿素的积累;375 kg·hm^(-2)磷酸氢二铵和尿素有利于木质部叶绿素的积累。施用375 kg·hm^(-2)的磷酸氢二铵时,潍县青萝卜肉质根的叶绿素含量最高。

Taking green radish produced in Wei County as experimental material,this paper studied the effects of 4 nitrogen fertilizers（diammonium phosphate,ammonium nitrate,ammonium sulfate and urea）with 4 different dosages（125,250,375,500 kg·hm-2）on the chlorophyll content in fleshy roots of green radish produced in Wei County. The results showed that the chlorophyll content in fleshy roots showed a downtrend from early,middle and late stages of the growth period,and was not affected by different nitrogen fertilizers and dosages. However,the chlorophyll contents in fleshy radish roots were variant with different nitrogen fertilizers and dosages. Among them,the effect of ammonium nitrate was the least. 375 kg·hm-2 diammonium phosphate and 125,250 kg·hm-2 ammonium sulfate were favorable for chlorophyll accumulation at pholem. 375 kg·hm-2 of diammonium phosphate and urea were favorable for chlorophyll accumulation at its xylem. The chlorophyll content in fleshy roots of green radish produced in Wei County reached the maximum value,when applying diammonium phosphate with 375 kg·hm-2 dosage.