Study On Nutrient Element Contents In Orchard Soils And Pear Trees In Southern Heilongjiang Province Of China

This study analyzed the tree nutrition, soil nutrient and the effects of them on yield by50pearorchards in southeasters Heilongjiang province,in order to provide experimental basis for reasonablefertilization. The main results were as follows:[1] Soil pH below the suitable standard values was at the rate0f66%. Low Soil pH had become aobstacle factor Influencing of pear production in heilongjiang province. Soil organic matter, exchangea-ble Mg, exchangeable Ca is rich. P, Fe, Cu, B below the suitable standard values were at the rate0f22%,28%,76%,27%. N, K, Zn below the suitable standard values had some Garden. Organic matter and tot-al N in the soil had bigger influence on the other elements.Soil pH and N, P, K, Ca, Mg, Zn, Mn in siolhad certain synergy, and the antagonism with the Fe and Cu a certain range.[2] P is rich in leaves. K, Zn, Cu below the suitable standard values were at the rate0f48%,20%,10%in leaves. N, Ca, Mg, Fe, Mn below the suitable standard values had some Garden in leaves. Cont-ent of Zn and K is close to other elements content. P, K, Zn had a certain degree of synergy, and had acertain antagonism with Mg.[3] Soil nutrient had no significant correlation with the nutrition in leaves. It was suggested that for-mulated fertilization should be mainly based on leaf diagnosis and supplemented by soil testing.[4] Very few pear orchards have high production in Heilongjiang province.Improving soil pH andincrement in Ca, Mg, Cu in the soil can increase production of pear.