生物炭还田条件下磷肥减施对玉米产量及养分利用的影响
通过四年田间定位试验,研究辽宁昌图棕壤区生物炭还田条件下磷肥减施20%对玉米产量及养分利用的影响。结果表明,与常规施肥(氮、磷、钾施用量分别为180、75、90 kg/hm2)相比,生物炭还田(3000 kg/hm2)后各处理促进玉米增产,最高增产5.54%,并且生物炭还田配施磷肥减量20%处理的产量在试验后期不但没有减少反而表现出略有增加的趋势；生物炭还田后各处理均提高了玉米植株N、P和K的养分吸收量,并提高了玉米植株氮素和磷素利用率,其中生物炭还田配施常规肥处理可以更好的促进玉米的氮、磷、钾养分吸收,提高了玉米氮素利用率,四年综合提高5.3个百分点,生物炭还田配施磷肥减量20%处理可以更好的提高玉米磷素利用率,四年综合提高4.9个百分点。
英文摘要:
Four-year field experiments were carried out to research the effects of reducing 20% phosphorus fertilizer on maize yield and nutrient utilization under biochar returning.The results showed that compared with the conventional fertilization(N, P2O5, K2O application amount was 180,75,90 kg/hm2), the yield of maize was increased by the treaments under biochar returning(3000kg/hm2), with the maximum increase of 5.54%.While,the yield was not decreased but showed a slight increase trend at the later stage of the experiment under biochar returning plus phosphate fertilizer 20% reduction. Biochar returning increased nitrogen, phosphorus or potassium nutrient uptake and nitrogen or phosphorus utilization efficiency of maize plant. Biochar returning plus conventional fertilization was better to promote the absorption of nitrogen, phosphorus and potassium,and increase nitrogen utilization rate by 5.3 percentage points through a total of 4 years. Biochar returning plus phosphate fertilizer 20% reduction was better to promote the increase of nitrogen utilization rate by 4.9 percentage points through a total of 4 years.
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