Abstract:

Excessive fertilization is one of the key reasons of soil acidification, and developing reasonable fertilization strategies is of great significance for green and sustainable agriculture. Two fertilization modes were adopted on Asparagus officinalis L. in this study: 667 m² 800 kg organic fertilizer+fertilizer reduction (Mode 1) and 667 m² 300 kg soil amendment containing humic acid+667 m² 400 kg organic fertilizer+fertilizer reduction (Mode 2), and their impact on yield of Asparagus officinalis L. and soil quality were studied. The results showed that compared with conventional fertilization, Mode 1 treatment had no significant effect on the number of stems per plant, plant height, stem diameter, first branch height, qualified yield, and total yield of Asparagus officinalis L., but increased the yield of first level Asparagus officinalis L.. Moreover, Mode 2 treatment increased the plant height and stem diameter of Asparagus officinalis L., as well as the yield of first grade, second grade, qualified, and total yield of Asparagus officinalis L.. The results indicated that under these two fertilization modes, reducing fertilization rate did not reduce total yield of Asparagus officinalis L., but improve the yield of high-quality Asparagus officinalis L.. Compared with conventional fertilization, Mode 1 and Mode 2 treatments can effectively increase soil pH value and organic matter content, reduce total exchangeable acids, exchangeable hydrogen, exchangeable aluminium, and exchangeable manganese in soil, increase cation exchange capacity, exchangeable calcium and magnesium content in soil, which was more significant in Mode 2. Therefore, both Mode 1 and Mode 2 fertilization modes can relieve soil acidification and improve soil fertility while ensuring yield of Asparagus officinalis L., with Mode 2 having the better effect.

Key words: Asparagus officinalis L., acidification, reduced fertilization, soil amendments, yield, soil quality