旱作果园深沟施肥对苹果树根系分布的影响

用干挖壕沟法研究了深沟施肥农艺措施对旱作苹果树根系的重量、结构和分布范围等的影响，结果表明，与未挖泡的对照相比，深沟施肥后，根系的总重量、总体积和分布深度都大幅度减少，总重量减少了５０％，总体积减少了６０％，分布深度减小了１．８ｍ；但吸收根的总长度增加，吸收根在总根量中所占的比例亦大幅度提高。

AFFECTION OF DEEP DITCH MANURING METHOD TO APPLE ROOT SYSTEM PATTERN IN ARID FARMING ORCHARD

With the method of dry ditching,the paper studied the affection of deep ditch manuring measure to the weight,composition and distribution scope of apple root system.It is proved that the total root weight,volume and length of the deep ditch manured tree were decrease sharply compared with those of check tree.The decreased data were 50%,60% and 1.8 m respectively.But the length of small root (function roots) and its partition were increased.The apple root system of the deep ditch manured tree showed an economic growth pattern in which there was less big roots but more small one.The function roots concentrated in ditch area where has the optimum miniecological conditions, which was a best system pattern.