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采用盆栽试验,研究了在南方丘陵区酸性红壤上石灰和磷肥配合施用对墨西哥玉米产量和土壤养分含量的影响。结果表明:施磷(25～200 mg/kg)能显著提高墨西哥玉米的生物产量,且其效应基本是随磷肥用量增加而增加;墨西哥玉米的经济产量与低量石灰(0～1.4 g/kg)呈正相关,与高量石灰(2.1～2.8 g/kg)呈负相关,以1.4 g/kg的石灰和高量磷(200 mg/kg)为最高产组合。各磷肥用量下,土壤pH、速效磷和水溶性镁含量随石灰用量增加而普遍升高,土壤铝饱和度则降低;各石灰用量下,土壤速效磷和水溶性镁含量随磷肥施用量增加而显著升高。
A pot experiment was conducted to study the effects of lime and phosphate fertilizers on maize yield and soil nutrient content in acid red soils in the hilly area of southern China. The results showed that phosphorus (25-200 mg / kg) significantly increased the biomass of maize in Mexico, and its effect basically increased with the increase of the amount of phosphate fertilizer. The economic yield of Mexican maize was significantly lower than that of low-level lime (0-1.4 g / kg) ), And was negatively correlated with high amount of lime (2.1-2.8 g / kg), with the highest yield of 1.4 g / kg lime and high phosphorus (200 mg / kg). Soil phosphorus, available phosphorus and water-soluble magnesium content generally increased with the increase of lime dosage and soil aluminum saturation decreased with the amount of phosphate fertilizer. With the amount of lime fertilizer, the content of soil available phosphorus and water-soluble magnesium increased with the application amount of phosphorus fertilizer Significantly increased.