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在无植物栽培的条件下通过肥料在土壤中的扩散试验研究酸性根际肥对石灰性土壤 pH值、有效铁含量的影响 ,利用盆栽试验验证对石灰性土壤上花生缺铁失绿黄化症的矫正效果。结果表明 ,酸性根际肥 (pH 1.0～ 2 .0 )中的酸在土壤中扩散的影响半径可达 6cm ,但对土壤pH降低作用最显著的是在距肥料 2cm内 ;在施肥 2 8d内 ,距肥料 2cm处 ,土壤 pH值降低了 0 .9个单位 ,土壤铁有效性 (DTPA浸提量 )增加了 5 .9mg kg ;施用酸性根际肥可使花生叶绿素SPAD值与叶片活性铁含量显著提高 ,克服了花生缺铁黄化症状 ,使施肥区 (肥料周围 2cm内 )土壤pH值显著降低 ,并显著提高了该区土壤铁的有效性和花生对土壤Fe的吸收量。
The effect of acid rhizosphere fertilizer on the pH value and available iron content of calcareous soils was studied by means of diffusion test of fertilizers in soils without plant culture. Pot experiments were conducted to verify the effects of acid rhizogenes on iron deficiency and chlorosis of peanut in calcareous soils The correction effect. The results showed that acid rhizosphere fertilizer (pH 1.0 ~ 2.0) of the acid diffusion in the soil radius of up to 6cm, but the most significant role in reducing soil pH within 2cm from the fertilizer; fertilization within 28d , The soil pH value decreased by 0.9 unit at the site of 2 cm of fertilizers and the soil iron availability (DTPA extract) increased by 5.9 mg kg. The application of acid rhizosphere fertilizer could make SPAD value of peanut and active iron content Significantly increased and overcame the iron deficiency and yellowing symptoms of peanut. The soil pH value in fertilization area (within 2cm around fertilizer) was significantly reduced, and the availability of soil iron and the absorption of soil Fe by peanut were significantly increased.