木质素锌肥在粤北石灰性土壤上的生物有效性研究

木质素锌肥是利用造纸工业副产品木质素为原料合成的一种有机微肥，通过淋溶与盆栽试验研究了木质素锌肥与无机锌肥在粤北两种石灰性土壤上的生物有效性差异．结果表明。木质素螯合锌被土壤固定、吸附量要明显小于无机锌，对于土壤B，当Zn用量为10mg·kg^-1时，木质素锌肥处理锌溶出量比无机锌高65．2％；施用木质素锌肥的处理玉米长势好，不仅生物量高过无机锌肥，而且更有利于玉米对锌的吸收，在土壤A上，当Zn用量为10mg·kg^-1时，木质素锌肥处理的生物量比无机锌增产16．3％。植株锌含量比无机锌肥高81．2％，木质素锌肥的生物有效性优于无机锌肥。

Biological availability of zinc lignosulfonate on calcareous soil of north Guangdong Province

Zinc lignosulfonate (Zn-LS) is a kind of organic fertilizers made from the by-products of paper industry. With leach and plot treatments, this paper studied the difference of the biological availability between Zn-LS and an inorganic Zn-fertilizer on calcareous soil of north Guangdong Province. The results indicated that the Zn of Zn-LS was less absorbed by calcareous soil. In soil B, when applying 10 mg x kg(-1) Zn, the dissolved amount of Zn-LS was 65.2% higher than that of inorganic Zn-fertilizer, corn grew well, and its biomass was higher. In soil A, when applying 10 mg x kg(-1) Zn of Zn-LS, the biomass of corn increased by 16.3%, and its Zn content was 81.2% higher. Therefore, biological availability of Zn-LS was better than that of inorganic Zn fertilizer.