磷基土壤调理剂在低磷红壤上对小白菜生长的影响

Effects of Phosphorus-based Soil Conditioner on Growth of Chinese Cabbage in Low-phosphorus Red Soil

采用盆栽试验研究不同用量的土壤调理剂对低磷红壤改良及小白菜生长的影响。研究结果表明:土壤调理剂提高了土壤团聚体的数量、pH、全磷、有机质及阳离子交换量,以200%和100%土壤调理剂效果最好,显著高于化肥和不施磷肥处理;200%土壤调理剂处理的小白菜地上部与地下部干重分别为化肥处理的83.3%和81.3%,是不施磷的4.48倍和2.8倍;50%土壤调理剂处理的水溶性糖含量与还原糖分别比不施磷肥增加77.92%和57.94%;50%土壤调理剂处理小白菜地上部磷含量最高0.4%,比不施磷肥提高42.86%,磷素利用率26.7%。说明磷基土壤调理剂可部分替代磷肥,且土壤调理剂用量越高,对低磷红壤的改良效果越好。

A pot experiment was conducted to study the effects of different amounts of soil conditioner on the improvement of low phosphorus red soil and the growth of Chinese cabbage. The results indicated that soil conditioner increased the number of soil aggregates, pH, total phosphorus, organic matter and cation exchange capacity, and the effects of 200% and 100% soil conditioner were the best, which were significantly higher than that of chemical fertilizer and phosphorus deficiency treatment. The dry weight of the aboveground and underground parts of Chinese cabbage treated with 200% soil conditioner was 83.3% and 81.3% of that of chemical fertilizer treatment, respectively, 4.48 times and 2.8 times of that of phosphorus deficiency treatment.Water-soluble sugar and reducing sugar content increased by 77.92% and 57.94% under 50% soil conditioner treatment compared with those under phosphorus deficiency treatment. The highest phosphorus content of the aboveground part of Chinese cabbage was 0.4% under 50% soil conditioner treatment, 42.86% higher than that of phosphorus deficiency treatment, and the phosphorus utilization rate was 26.7%. The results indicated that the phosphorus-based soil conditioner could partially replace phosphorus fertilizer, and the higher the amount of soil conditioner application, the better the improvement effect on low-phosphorus red soil.