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3种紫色土施用化学氮肥盆栽莴笋的研究结果表明,石灰性紫色土莴笋生长状况最差,施中、高氮明显降低其株高、根重和茎、叶产量,而中性紫色土施氮的生物效应最佳。酸性紫色土莴笋叶片((NO~-_3-N)/(TN)×100)值最低、((AAN)/(TN)×100)值最高;植株氮素表观利用率为中性土>酸性土>石灰性紫色土。中性、酸性和石灰性紫色土施氮分别为133、67、67mg/kg土时,莴笋3个生长期叶片N/P、N/K、K/P值变异系数(C.V％)小,生物量高。施氮显著提高中性和石灰性紫色土莴笋叶片NRA(r值0.9275～0.9956),降低CAT活性和Vc含量,使茎中(△NO~-_3)/(△FN)值高于酸性紫色土2～5倍,但却提高酸性紫色土莴笋水溶性氨基酸、粗蛋白和可溶性糖含量,改善其食用价值。
The results of potted lettuce with three chemical fertilizers on purple soil showed that the lettuce grew worse on calcareous purple soil, and the plant height, root weight, stem and leaf yield were obviously decreased when medium and high nitrogen were applied, while nitrogen The biological effect of the best. The value of (NO ~ -_3-N) / (TN) × 100 was the lowest in the leaves of acid purple soil and the highest was (AAN / (TN) × 100). The apparent nitrogen use efficiency of the plants was neutral soil> Acid soil> lime purple soil. N, P, N / K and K / P of three lettuce cultivars were lower than that of the neutral, acid and calcareous purple soils, High volume. Nitrogen addition significantly increased NRA (r value 0.9275-0.9956) in leaves of both neutral and calcareous purple lettuce leaves, decreased CAT activity and Vc content, and increased the value of △ NO ~ -_3 / △ FN in the stems of acid purple soil 2 ~ 5 times, but it increased the content of water-soluble amino acids, crude protein and soluble sugar in acidic purple soil lettuce, and improved its edible value.