金坛市无氮区土壤肥力评价和对小麦基础产量的影响

通过田间试验,研究了金坛市各镇区土壤不施氮肥对小麦基础产量的影响,并根据土壤养分指标即土壤有机质、全氮、碱解氮、速效磷、速效钾5个指标评价了土壤肥力水平。结果显示,金坛市小麦不施氮肥高产田土壤基础产量为3043 kg/hm2,中产田为2524 kg/hm2,低产田为2083 kg/hm2。隶属度函数和相关分析权重确定的综合评价指标IFI显示,高、中、低产田IFI平均值分别为83,69和54。IFI与基础产量进行回归分析表明二者线性关系达极显著水平。因而,本试验选定的养分指标能够客观反应土壤肥力实际情况,对土壤肥力评价和小麦科学施肥具有重要应用价值。

The evaluation of Jintan city soil fertility without nitrogen fertilizer and the effects on wheat yields

A field experiment was conducted to study the effect of soil without nitrogen fertilizer on wheat yields in different towns of Jintan City.Also,soil fertility level was evaluated by five soil indicators,that was soil organic matter,nitrogen,alkali-soluble nitrogen,available phosphorus and available potassium.The results showed that,high-yielding fields without nitrogenous fertilizer produced wheat 3043 kg/hm2,middle and low-yielding fields produced wheat 2524 kg/hm2 and 2083 kg/hm2,respectively.IFI value, represented comprehensive soil fertility level,determined by the five soil indicators with membership functions and correlation analysis showed high,medium and low-yielding farmland was 83,69 and 54,respectively.The relationships between IFI value and wheat yields without nitrogen fertilizer were very significant after linear regression analysis.Thus,the soil indicators selected in our experiment could objectively reflect the actual soil fertility situation,and had far-reaching impacts on soil fertility evaluation and wheat scientific fertilization.