【摘要】 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，玉米出现类似镁中毒症状，收获期籽粒及其粗蛋白质产量只稍高于未施锌水平。绿洲盐化潮土的适宜施Zn量为3～5mg／kg。更多还原

【Abstract】 The effect of chcmical Zn and its optirnum rate were studied when Zn was applied to maize which was planted in a pit filled with salinized fluvo-aquic soil from oasis of Hexi area. The experimental results show that maize normal growth can not be mct when chemical Zn was applied at the Iate of 12mg/kg in the pit. Meanwhlle, Zn nutrition level for maize is significantly improvcd 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 % respectivcly 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 necded 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.更多还原