黄土高原设施农业中的土壤连作障碍

在黄土高原的延安日光温室条件下,通过田间试验研究了黄瓜不同连作年限土壤的肥力特性、土壤微生物特性以及对黄瓜生长发育和产量的影响。结果表明,随着黄瓜连作年限的延长,土壤主要肥力指标明显上升,但N、P肥增加的幅度与K的比例失调;土壤中细菌和真菌数量明显增加,而放线菌无明显增加,甚至降低;黄瓜主要病害发生程度加重;不同连作年限土壤对黄瓜生长特性和产量均有极为显著的影响。

Soil Continuous Cropping Obstacles in Facility Agriculture on Loess Plateau

Based on field experiment in sunlight greenhouse on Loess Plateau, this paper dealt with the continuous cropping obstacle of cucumber. The results showed that, as continuous cropping years increasing, soil main fertility index increased, but the ratio of N, P and K was not rationale. As continuous cropping years increasing, soil bacteria and epiphyte quantity increased obviously, but fugue not increased, cucumber main disease become serious. There were significant difference in growth characteristics and productivity in continuous cropping years.