Response of different maize of various susceptibility to zinc application under sand culture conditions.

【Objective】The experiment was conducted to study the responses of different maize(Zea mays L.) to zinc-susceptibility and endurance at four zinc supplying rates(0,0.5,1.5,3.0 mg/kg sand).【Method】A sand experiment of maize seedling growth was conducted using maize of susceptibility(Shaandan 902,Shaandan 911,Nongda 60,Zhongdan 2 and Hudan 2000) and non-susceptibility(Xinshanzi 1,Zhengdan 958,Shaandan 8813,Gaonong 1 and Hudan 1) to Zn deficiency in a greenhouse.【Result】The tentative results indicated that,when low rate of Zn(0.5 mg/kg) was supplied,the maize plants of zinc-susceptibility type to zinc deficiency were more sensitive than non-susceptibility maize plants.The susceptible genotypes to zinc deficiency had higher root to shoot ratios than non-susceptibility maize plants,because the root of zinc susceptibility genotypes grew better and could take up more nutrients.The decrease of root to shoot ratios promoted correspondingly the growth of the shoot.The maize plants for non-susceptibility genotypes under low zinc rate were damaged more seriously than those under zinc deficiency.Zinc taken up by maize seedlings was mainly accumulated in roots when the zinc supplying rate was 0.5 mg/kg.Zinc concentration in maize plants for zinc susceptibility types was increased obviously when zinc application rate was increased to 1.5 mg/kg,zinc concentrations increased by 20.5%,53.6% and 18.5% in root,stem and leaf,respectively while that of the non-zinc susceptibility types increased by 5.5%,83.4% and 60.7%,respectively.【Conclusion】The Zn taken up by susceptibility genotypes was readily translocated to shoots,and increased the zinc concentration in shoot and the range of zinc concentration increased was higher than that of the non-susceptibility genotypes.The growth and Zn distribution of different zinc-susceptibility maize types were entirely different under zinc deficiency condition,moreover,there also existed difference for zinc uptake at zinc supply.