Research on forest and crops interplanting on the front closing forest land of poplar tree;

In order to study the effects of tree-crop intercropping on young plantations of Populus tomentosa in the plain along the Yellow River,field experiments have been conducted by observing the growth of forests,nutrient contents in leaves,nutrient contents and water contents in soil and the output of crops.

Effects of inorganic fertilizers on biological nitrogen fixation and seedling growth of some agroforestry trees in Bangladesh;