Journal of Jilin Agricultural University

Abstract

Apot experiment using paddy soil in the middle area of Jinlin orovince was cinducted to investigate the effects of zinc on the late mature japonica ruce “Nongda 3”.The resukt showed that when the concentration was under 300 mg/kg,zinc application was favorable to the growth of rice.Rice p;ant height increased by 2.4~6.9cm,the number of leaves and tillers and tillers increased by 1.7~9.7 and 17.6~48.3 respectively,and the mature period was 5 days in advance.When the rate was above 500mg/kg,lant height decreased by 11.2~13.4cm,whit leave number 17.6~48.3 and the number of tillers 4~6 inhibited.The appearance of the most leaved and the differentiation of rice spike were delayed for 10 days and 5days,respectively.Rice yield decreased by 4.91%~43.40% in high concentrations