Analysis of Growth and Development Regularity and Waterlogging Resistance of Two Varieties of Walnut Rootstocks

The growth regularity and waterlogging resistance were analyzed for Juglans sigillata and black walnut (J. nigra).The results showed that (1) leaves of black walnut germinated later than of those J. sigillata,but new shoots would stopped growing and wilting early.(2) J. sigillata grew fast,especially in May and June, and black walnut grew up mainly in May,June and July;(3) Extremely high temperature and water shortage were the main influencing factors of black walnut's poor growth; (4)Black walnut was more resistant to waterlogging than J. sigillata.