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近年来,随着工业的发展,城市建设规模的扩大,人口的增多,靠近市区的老菜田、队不断减少,新菜田、队大量增加,迫切需要解决新开发菜田的快速培肥问题;工业发展带来的环境恶化,有机肥短缺,城市垃圾肥、化肥的大量施用,栽培管理不良等也给老菜田的培肥提出了新课题。为此,我们于1983年对天津市不同种植年限的菜园土(百年以上,40—50年,20—30年,10年,5年以下)进行了土壤剖面及肥力诊断,对
In recent years, with the development of industry, the scale of urban construction has expanded, the population has increased, and the number of old vegetable fields near urban areas has been declining. As a result, there has been a substantial increase in new vegetable fields and teams. There is an urgent need to solve the problem of rapid fertilization of newly developed vegetable fields Problems; the deterioration of the environment brought by industrial development, the shortage of organic fertilizers, the heavy application of municipal solid waste fertilizers and fertilizers, the poor cultivation and management, etc., also put forward new topics for the fertilization of old vegetable fields. To this end, we conducted soil profile and fertility diagnosis in 1983 in garden soil (over a hundred years, 40-50 years, 20-30 years, 10 years and 5 years) of different planting years in Tianjin.