SURVEY ON THE EFFECT OF PLANTATION SEASON ON THE GROWTH, YIELD AND QUALITY OF MEDICINAL HERBS OF XA SANG PLANT (Cnidium monnieri L.) IN SA PA WARD, LAO CAI PROVINCE

Abstract

Survey of the influence of planting season on the growth, yield and quality of Cnidium monnieri L. medicinal plant in Sa Pa ward, Lao Cai province. The experiment included 6 formulas: CT1: Planting on September 15; CT 2: Sowing on October 15; CT 3: Sowing on February 15; CT 4: Sowing on March 15; CT 5: Sowing on June 15; CT 6: Sowing on July 15. The formulas were arranged according to the randomized complete block method (RCB) with 3 replications, each replication was 10 m2, the total experimental area was 180 m². The research results showed that the sowing season with the highest yield and the best active ingredient content was the sowing season on March 15 (CT 4) with the following criteria: Germination rate 88%, plant height 93.9 cm, number of leaves/plant 16.6 leaves, canopy diameter 34.7 cm, number of branches/plant 7.7 branches) for the highest medicinal yield of 10.4 quintals/ha and the highest osthol content of 3.50%, much higher than the current Vietnamese Pharmacopoeia V Standard (Osthol > 1.0%). The season with the lowest yield and osthol content was the sowing season on October 15 (CT 2) with a yield of 8.0 quintals/ha, and an osthol content of only 2.21%.