河北省唐山地区春玉米产量的土壤养分限制因子研究

采用田间试验的方法研究了唐山地区春玉米产量的土壤养分限制因子，分析了春玉米产量构成因素对其产量的影响。田间试验结果显示，在唐山地区缺钾、缺锌、缺铁等施肥处理对春玉米产量影响较大，与全素处理相比，各处理的穗粒数分别减少29、23、22个，相对产量分别降低11.1、7.9、6.6%，差异均达到显著水平。这表明：钾、锌、铁主要通过减少春玉米的穗粒数而影响春玉米产量，是春玉米产量的主要土壤养分限制因子。

Investigation of Restrict Yield Nutrient of Spring Corn in Tangshan in Hebei Province

The effect of constituent elements of the yield on spring corn and its restrict yield nutrient in Tang- shan was studied. Field experiment was used in the investigation, and the biological yield and its constituent elements have been tested in this experiment. There were 11 treatments in the experiment, such as CK, OPT, -N, -P, -K, -Cu, -Fe, -Mn, -Zn, -Mo and B, and were 3 repeats in each treatment. The results showed that the yield of spring corn was decreased significantly by the decreasing potassium, zinc or iron in Tangshan. To contrast to optimum fertilization treatment, potassium, zinc, iron treatments reduced grain number per spike of spring eora significantly, the quantity reduced by 29, 24, 23 respectively. In the meantime, their frac- tional yield were also decreased significantly, the ratio reduced by 11.1%, 7.9%, 6.6% respectively. It is clear that potassium, zinc and iron were the restrict yield nutrients of spring corn and they made an impact on yield of spring corn by decreasing grain number per spike mainly.