Abstract:

Land recultivation can increase the area of cultivated land, provide a production basis for food security, reduce the occupation of cultivated land resources by non-agricultural land, and help protect agricultural ecology. Compared with the soil cultivated all year round, the recultivated soil has low soil fertility, poor physical structure and poor micro-ecological environment. It is necessary to improve the quality of recultivated soil through subsequent soil improvement technology and fertilization technology. Through the summary of the current soil improvement and fertilization technology in China, the current situation of sustainable utilization of recultivated soil was discussed, and the problems existing in the sustainable utilization of recultivated soil in China were pointed out and targeted suggestions were put forward, so as to provide guidance for better sustainable utilization of recultivated soil and ensure food security. The research showed that the improvement of recultivated soil should be analyzed according to different soil conditions. Suitable soil improvement methods should be selected for construction land, forest land and economic crop land to improve soil quality and improve soil nutrients. Re-tillage soil improvement mainly includes physical, chemical and biological improvement techniques. At present, combined improvement techniques are mostly used. The compound cultivated land could regulate soil nutrient status, improve soil conditions and create a good soil ecological environment for plant growth through fertilization. The main ways include adding organic fertilizer, trace element fertilizer, formula fertilization and agronomic measures to fertilize. In order to further promote the rational utilization of recultivated soil and clarify the improvement and fertilization mechanism of recultivated soil, it is necessary to improve the following aspects: constructing the conservation technology system of re-cultivated soil, and carrying out multi-angle and multi-level comprehensive management of recultivated soil; establishing the quality evaluation index system of recultivated soil; playing the ecological service function of recultivated land.

Key words: soil improvement, plant productivity, soil fertilization, organic fertilizer, trace element fertilizer, formula fertilization