Abstract: Abstract: [research goal]The diagnosis Dezhou soil fertility change rule, the low productivity soil science applies fertilizer for the Huanghuai sea level original area in provides the basis; [method]20 years carry on three time large-scale soil fertility distributed condition investigation, according to high school low and different soil type classification stationing, altogether adopt soil sample 63564, the monitor analyze more than 80,000 times; [result]Indicated that my city soil nutrient structure had the change, the organic matter has increased, but the content was somewhat low, the nitrogen was insufficient, although the phosphoric quantity increased the scope to be big, but the employment phosphate fertilizer still had the remarkable production increase effect. Since the fast-acting potassium content has reduced becomes 1998 gradual increase gradually after 1982. The partial soil trace element assumes the trend of escalation deficient. The soil fertility distribution is uneven, the scope is broad, although after people's cultivation, applies fertilizer and irrigates, the soil fertility improves, but the high production soil distribution area are few, the low productivity soil still held the quite great proportion, the improvement use and cultivates the fat potential to be very also big; [conclusion]Needs the fat rule and the fertilizer characteristic according to each kind of crops, implements measured that the earth formula applies fertilizer the technology, in increases executes the organic fertilizer in the foundation, in line with the steady nitrogen, the steady phosphorus, makes up Shi Jia and micro fat and the crops lacks any fertilizer to make up anything, lacks the how much fertilizers to make up how many principle, achieves the soil for to need fat basic balanced fat with the crops.