论文部分内容阅读
通过岩棉、盆钵和大田栽培试验,研究过量锌肥对玉水致毒的可能性。试验结果表明:营养液中锌浓度达到26.2mg/L(高出正常情况的200倍)、盆栽和大田土壤施锌量达到750kg/亩时,玉米幼苗地上部干物产量和籽粒产量与正常施锌量处理相比,没有显著差异,这说明锌本身对植物的毒性是极小的。锌在玉米各器官内的分配顺序为茎>根>叶>籽粒;在施入最低和最高锌情况下,籽粒中锌浓度变幅仅为17-44μg/g,可见玉米的富锌能力是十分有限的。通过计算土壤锌的环境容量,3种供试土壤在亩施750kg锌肥的情况下,1-3个月后的环境容量为每亩278-352kg硫酸锌,表明石灰性土壤对锌的包容能力是巨大的,故在石灰性土壤上产生植物锌中毒是较困难的。
By rockwool, pots and field cultivation experiments to study the possibility of excess zinc fertilizer toxic to jade. The results showed that when the zinc concentration in nutrient solution reached 26.2mg / L (200 times higher than that in normal condition), the dry matter yield and grain yield in shoots of potted and field soil reached 750kg / There was no significant difference between the treatments, indicating that zinc itself is extremely toxic to plants. The order of zinc distribution in different organs of corn was stem> root> leaf> grain. Under the condition of lowest and highest zinc, the amplitude of zinc concentration in grain was only 17-44 μg / g, showing that the ability of zinc enrichment in corn was very high limited. By calculating the environmental capacity of soil zinc, the environmental capacity of three kinds of soil tested in the case of applying 750kg of zinc fertilizer per mu for 1-3 months was 278-352kg of zinc sulfate per acre, which showed that the tolerance of soil to zinc by calcareous soil Is huge, it is more difficult to produce plant zinc poisoning on calcareous soil.