Abstract:

This study analyzed the effects of different densities(low density: 52 g·m^-2; medium density: 72 g·m^-2; high density: 82 g·m^-2) of degradable ground cloth on the growth and soil properties of citrus saplings with the aim of providing guidance on selecting suitable degradable ground cloth for citrus orchards. Results showed that low and medium density degradable ground cloth had no significant impact on above-ground plant growth or root distribution ratio at different soil depths but significantly reduced the total number of roots compared with the control treatment. In contrast, high-density degradable ground cloth significantly improved above-ground plant growth without decreasing the total number of roots but led to roots tending to be distributed in shallow soil layers (0-<20 cm depth). The three types of ground cloth didn't significantly affect soil bulk density, but increased water content in topsoil and decreased it in deep soil, which may have played a role in root distribution. Consequently, the study suggested using high-density degradable ground cloth in citrus orchards. Meanwhile, it was important that deep soil improvement should be conducted before covering the ground cloth to prevent root floating.

Key words: ground cloth mulching, citrus, soil properties, growth, root system