The present situation of soil nutrients〔include available nitrogen(AN)

available phosphorus(AP)and available kalium(AK)〕in Linwei District was investigated by analyzing soil samples collected from 4 108sampling sites and using domain method to identify the outliers and optimal Kriging interpolation.Meanwhile

the nutrient abundance index for wheat

corn and cotton was determined by the experimental datafrom 2007to 2008.Results indicated that the demand of crop growth for AN was nearly satisfied

exceptthat only 0.09%of cropland showed AN deficiency for the wheat and 0.86%of cropland

for corn and cotton.The content of AP was relatively low

especially in the middle of Xiaji Town

the east of GuandaoTown

the north of Xiaoyi Town

the northwest and southeast of Fengyuan Town and the west of YangguoTown.The demand of wheat and corn for AK was fulfilled but that of cotton was unsatisfied

especially inthe west and north of Yangguo Town.The mean ratio of AN to AP was 4:1

representing an imbalancestate.Therefore

it is necessary to increase the amounts of AN and AP through applying AP by specific yieldand applying AN by the applied AP.