Abstract:

To improve the quality of the cutting seedlings of Passiflora caerulea in Yunnan, suitable substrates for cultivating the cutting seedlings of P. caerulea were selected. Red soil, coconut chaff and river sand were used as substrate raw materials to study the effects of single substrate or mixed substrates with 10 different ratios on the root system of P. caerulea cutting seedlings, and the cost of seedling cultivation was analyzed. The results showed that different substrate treatments had significant effects on the rooting rate of P. caerulea cuttings. 45 days after cutting, the rooting rate of P. caerulea cuttings was the highest in substrates with the ratio of red soil: coconut chaff of 3:7 and red soil: coconut chaff of 5:5, the rooting rate was (76.67±6.67)% and (74.44±12.62)%, respectively. The treatments with red soil: coconut chaff of 7:3, red soil: coconut chaff of 3:7, red soil: coconut chaff of 8:2 and red soil: coconut chaff of 5:5 had a large number of roots, all of which were more than 20. The treatments with coconut chaff only or red soil: coconut chaff of 5:5 had relatively long roots, and the longest roots could reach more than 5 cm. Considering the rooting rate, root number, the length of the longest root, as well as substrate cost of P. caerulea cutting seedlings under different substrate treatments, it is suggested that the ratio of red soil to coconut chaff of 5:5 should be popularized in production.

Key words: Passiflora caerulea, cuttage, substrate, root system