Research on influence of treated water temperature to germination and shading to growth of Carya tonkinensis Lecomte, 1921 in nursery

Abstract

Carya tonkinensis Lecomte, 1921 is a native and end endemic tree species,
everage tree with high economic and conservation values, stenotopic, in
Vietnam is only distributed in some districts and cities of Son La provinces.
This is a species listed in the Red Book of Vietnam with an assessment “will
endangered, level V”. However, the information on this species is very limited and there are no studies on silvicultural characteristics, propagation and planting. Therefore, it is essential to research on influence of water temperature processing to germination and shading to growth of Crarya tonkinensis Lecomte in nursery. Research results showed that water temperature processing affect germination rate significantly, formula soaking seeds in water temperature 60oC have the highest germination rate 82.79% and the lowest formula soaking seeds in water temperature 100oC with 21.11% germination rate. About shading in the first 4 months after sowing, shading 75% is appropriate, survival and ability to grow in height at high shading reached similar values application is 92.67% and 23.03cm. However, from after the 4th month to 8th month, shading 50% is appropriate, with survival rates as well as the growth reached the highest heights with the corresponding value was 92.66% and 52.74cm, seedling 7 - 8 months old qualified planted forest planting.