The Varied Trend of Topsoil Nutrient in Heilongjiang Province

The Heilongjiang provincial monitor plots have been set up for 4 years. There are 52 soil monitor plots in the province, including 12 national level plots and 40 provincial level plots.These soil monitor plots stand for soil that more than 70% cultivated land in Heilongjiong Province. By 4 years monitor, we have realized varied trend of soil fertility in major soil types for Heilongjiong province.as follows:①The organic matter in soil has no varied basically.②The nitrogen is unchanged and the phosphorus is increased, but potassium is less in soil.③The fertilizer application rate in soil of total provincial average is:N∶P∶K=1∶1.12∶0.7.④The fertilized amount in Heilongjiong provincial is less than the average amount in China.