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试验研究结果表明 ,在玉米高产施肥中 ,以氮肥效果最好 ,增产 33 6% ,其次为钾肥 ,增产 13 5% ,磷肥仅增产 7 8% ,中、微量元素肥料具有显著的增产效果。研究结果还表明 ,四密 2 5是吸收土壤养分能力较强和需肥数量较大的品种 ,在生产上应选择较高肥力的土壤种植并重视氮、钾化肥和中、微量元素肥料的施用 ,磷肥施用量要因土壤含磷量来确定 ,不宜过多。获得公顷产量 12 0 0 0kg以上时玉米的氮肥利用率为 4 0 1%以上 ,磷肥利用率为 18 7%以上 ,钾肥利用率为4 8 4 %以上。
The results showed that nitrogen fertilization was the best in yield improvement of maize, with yield increasing 33.6%, followed by potash fertilizer, increasing yield by 13.5% and phosphorus fertilizer only increasing yield by 7.8%. Medium and microelement fertilizers had a significant yield increase effect. The results also showed that Si255 is a kind of soil with strong nutrient absorption capacity and large amount of fertilizer required. In the production, the soil with higher fertility should be planted and nitrogen and potassium fertilizers and the application of trace and elemental fertilizers should be emphasized , Phosphate fertilizer to determine the amount of phosphorus due to soil, not too much. The nitrogen utilization rate of corn was over 401% when the yield was more than 1200kg, the utilization rate of phosphorus fertilizer was above 18.7%, and the potash utilization rate was above 484%.