| In order to explore the characteristics of wheat yield and fertilizer efficiency in the Yellow River Delta, the distribution of wheat yield and the contribution rate of fertilizer yield difference, yield response, relative yield, agronomic efficiency and partial productivity in different regions of the Yellow River Delta were statistically analyzed by retrieving the published relevant literature and using meta analysis. The results showed that the average yield of wheat was 6.00 t·hm-2 in the field experiment of the Yellow River Delta, with a wide variation range (2.69-8.65 t·hm-2). The average yield in different regions ranked as first sector>third sector>second sector, and the yield increasing effect of fertilizer ranked as phosphate fertilizer>potassium fertilizer>nitrogen fertilizer. The yield gap caused by fertilization was 2.40-2.87 t·hm-2, and the largest contribution to wheat yield gap is nitrogen fertilizer. The relative yields of nitrogen, phosphorus and potassium fertilizer were 0.96, 0.85 and 0.92, respectively. Under the conditions of basic soil fertility, soil nitrogen contributed the most to wheat yield, followed by potassium and phosphorus. The average agronomic efficiency of nitrogen, phosphorus and potassium fertilizer were 4.94, 12.13, and 15.33 kg·kg-1, respectively. The areas with high agronomic efficiency of nitrogen and phosphorus were the first sector, and the areas with high potassium agronomic efficiency were the second sector. The partial productivity of nitrogen, phosphorus and potassium fertilizer were 36.12, 60.95, and 82.92 kg·kg-1, respectively, which showed the highest value of the second sector. As a consequence, the fertilizer utilization rate of wheat in the Yellow River Delta needs to be improved. Nitrogen is the first limiting factor of wheat yield, indicating the reduced application of nitrogen fertilizer should be emphasized. There are great differences of soil fertility and fertilizer efficiency among different regions. In the process of fertilization, we need to adapt to local conditions and cooperate with soil improvement in order to achieve better effect of increasing yield and saving fertilizer. |
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