Abstract:

Based on the needs of the soil health management of the facility vegetable fields in Beijing suburbs, the soil health assessment methods at home and abroad, and the analysis results of the 1350 facility vegetable fields’ soil samples in Beijing, a field-scale facility vegetable field soil health assessment system was initially constructed. A total of 21 assessment indicators in four categories of physics, biology, chemistry and output were determined, and the threshold range, scoring standards, weights and assessment modules of each indicator were proposed. The system was used to evaluate the health of the facility vegetable fields’ soil in Fangshan District of Beijing. Five plantations were selected, and one experimental site was set up in each plantation. The evaluation results showed that: one of the five experimental sites belonged to sub-health grade, and the other four experimental sites belonged to health grade. Soil improvement and remediation were carried out for two consecutive years in the sub-health grade experimental site. The results showed that the soil health index increased from 0.77 to 0.83, and the soil health grade was raised to health level. In detail, the soil bulk density was reduced, the content of organic matter increased, the level of soil fertility increased, pH decreased, the yield of vegetables was stable, and the quality index increased. Soil management was carried out for two consecutive years in the health grade experimental site. The results showed that the soil health index increased from 0.86 to 0.87, the soil fertility level was stable, the pathogen index decreased, and the vegetable yield and the commodity rate increased. Therefore, the assessment system could perform a good guiding role in maintaining or improving the soil health level of facility vegetable fields, and it is suggested to carry out more extensive soil health assessment and soil remediation management of facility vegetable fields.

Key words: facility vegetable field, soil health, assessment method, assessment index, field scale