Effects of reducing chemical fertilizer application on yields and nitrate contents of cherry tomato and spring cabbage

The experiments of reducing chemical fertilizer application to the cherry tomato and spring cabbage fields were conducted in order to study the effects on their yields and nitrate contents.The(results showed) that when the N,P and K content of chemical fertilizer application was controlled within(20kg/666.7m~2) the yields of cherry tomato and spring cabbage did not decrease,but their nitrate contents somewhat reduced.Adding foliage spray made cherry tomato yield increase and its nitrate content slight high but still within the tolerance limit.Adding foliage spray increased the nitrate content of spring cabbage by a rather big margin and the reason needs further research.