Study on the Status of Grain Quality Security in Zhangjiagang City

Abstract

The quality of cultivated land use of Zhangjiagang was surveyed and analyzed in 2009. Overall distribution of cultivated land is mainly the second and the third class. The first and the fourth class are less. Spatial distribution of heavy metals content in soil, rice and wheat roots was analyzed by IDW interpolation. The results show that the contents of Hg, As, Se, Pb and Cu in soil have a certain differences in the spatial distribution. It mainly reflect that Hg pollute the soil in the southern region of Zhangjiagang. The contents of Hg, As, Se, Pb and Cu in rice, wheat roots also have a certain differences in the spatial distribution. It mainly reflect that Hg pollute the rice, wheat plants in the western and southern region of Zhangjiagang. The productivity of cultivated land has the overall downward trend from 1996 to 2009 in Zhangjiagang. There are 10818Kg/hm2 in 1996 and 8327 Kg/hm2 in 2009. The average decreased rate is 191.6Kg/hm2 every year.