The experiment on forest culture density of Robinia pseudoacacia

Hippophae Rhamnoides

Lespedeza bicolor

Caragana microphylla and Caragana korshinskii in the semiarid area showed that the high yield may beobtained for R. pseudoacacia with density 1×1m

if the rainfall is normal

the period of high yield with such density will last. The suitable donsityof crop for H.rhamnoides is 1×1m and 1×1.5m .The density 0.3×1m is rightfor L. bicolor before 4 years

after 5 years it depends on rainfall.C. microphylla branches out more

so the density 0.5×1.5m is suitable

while C. korshinskii ramifies less

the yield with density (seeding in lines×1.5m) ishigher than 0.5×1.5m

and its plants grow better.