Phosphorus and potassium fertilizer application effects are very different because of the available soil content. Increasing phosphorus and potassium is beneficial for early growth of strong seedlings, large spikes, increased grain-leaf ratio, increased grain number and grain weight, and is an important condition for improving population quality. However, after the application of P and K fertilizers, most of them were absorbed and fixed by the soil. The absorption and utilization rate in the season was low, the mobility in the soil was poor, and it was not easy to lose. The fertilizer effect lasted for several years. Therefore, in order to increase the seasonal absorption of P and K fertilizers. The utilization rate should be applied to the sowing line in the form of basal fertilizer in one application. This has the best effect, which is beneficial to the absorption and utilization of corn and promote the formation of high yield. Studies have shown that the application rate of phosphorus fertilizer in the sowing period was 8.5%, 13.7%, and 14.8% higher than that in the three-leaf exhibition, six-leaf exhibition, and nine-leaf exhibition; respectively; the application rate of potash fertilizer sowing was higher than that of three-leaf exhibition, six-leaf exhibition, and nine-leaf exhibition respectively. 2.1%, 5.1%, 11.6%.
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