Abstract:

To study the rot decomposition characteristics and nutrient release characteristics of three green manures of Orychophragmus violaceus L., Lolium perenne L. and Vicia villosa Roth. under orchard condition, a 110 days field decay experiment was conducted in apple orchards using nylon net bags. The results showed that the cumulative decomposition rate of the three green manures was 69.10%-76.06%. The three green manures decomposed rapidly during 0-21 days, and then the decomposition slowed down and tended to be stable. Carbon (C), nitrogen (N), phosphorus (P) and potassium (K) released rapidly in the first 21 days. The nutrient release rates of the three green manures were potassium>carbon>nitrogen>phosphorus. At the end of the experiment (110 days), the cumulative release rate of carbon, nitrogen, phosphorus and potassium were 76.81%-82.04%, 81.06%-84.97%, 72.96%-76.81% and 95.39%-97.65%, respectively. Compared with Lolium perenne L. (gramineae green manure), Orychophragmus violaceus L. (cruciferous green manure) and Vicia villosa Roth. (leguminous green manure) had lower initial C/N, more easy to decay, and more suitable for the north China plain orchard planting.

Key words: Orychophragmus violaceus L., Lolium perenne L., Vicia villosa Roth., decomposition characteristics, nutrient release