Nutrient absorption and requirement of one-year-old and two-year-old codonopsis lanceolate

Abstract

Misuse of fertilizer on Codonopsis. lanceolata is extensive due to scarce information concerning its nutrient absorption and requirement. The objective of this article is to clarify the nutrient uptake characteristics of C. lanceolata, analyze its nutrient requirement at different growing stages, and draft a rational fertilization procedure. Field experiments with seeds or one-year-old seedlings were conducted at the experimental station of Shandong Agricultural University, China from 2014 to 2016. Nitrogen (N), phosphorus (P) and potassium (K) accumulation of two-year-old C. lanceolata exhibited the same tendency as that of one-year-old plants, but the values were 16.92, 1.65 and 3.69 times higher for N, P and K, respectively. The absorptive ratio of N, P and K was 1:0.93:1.88 for one-year-old C. lanceolata and 1:0.10:0.33 for two-year-old C. lanceolata. The lowest absorptive capacity of N, P and K were found within 60 days after sowing (DAS) for one-year-old C. lanceolata and the highest absorptive capacity were found at 60-90 DAS and 120-150 DSA, respectively. For two-year-old C. lanceolata, the lowest absorptive capacity of N, P and K were within 60 days after transplanting (DAT) and the highest absorptive capacity were fallen within 60-90 DAT and 120-180 DAT. These data could be used to draft a rational fertilization procedure for C. lanceolata.