绿洲盐化潮土的锌肥效应及适宜用量

通过坑栽玉米试验研究了绿洲盐化潮土的锌肥效应及适宜用量。结果表明，土壤施Ｚｎ１￣２ｍｇ／ｋｇ时，不能保证玉米正常生长发育对锌营养的需求；施Ｚｎ３￣５ｍｇ／ｋｇ时，显著提高了土壤－植物锌营养水平，使玉米八叶期株高和干重依次增加１８．５％￣１８．８％和５７．３％￣５８．１％，收获期籽粒及其粗蛋白质产量分别增加２８．４％￣３２．１％和６７．５％￣６９．１％；施Ｚｎ１０￣２０ｍｇ／ｋｇ时，玉米出现类似镁中

The Effect of Chemical Zinc and Its Optimum Rate on Maize in Saline Fluvo-aquic Soil of Hexi Oasis Area

The effect of chemical Zn and its optimum rate were studied when Zn was applied to maize which was planted in a pit filled with salinized Iluvo-actuic soil from oasis of Hexi area. The experimental results show that maize normal growth can not be met when chemical Zn was applied at the rate of 12 mg/kg in the pit. Meanwhile,Zn nutrition level for maize is significantly improved when the rate was increased to 3~5 mg/kg,the height and the dry weight of plant were increased by 18.5%~18.8% and 57.3%~58.1% respectively when maize had 8 leaves. Also yields of the grain and the protein were increased by 28.4%~32.1% and 67.5%~69.1% respectively when maize was mature. On the other hand,maize normal growth is accelerated when chemical Zn was applied at the rate 10~20 mg/kg. But a symptom similar to a magnesium poisoning and needed to be studied carefully in future. In conclusion,the optimum rate of applied Zn to maize are 3~5 mg/kg in salinized fluvo-aquic soil of Hexi oasis area.