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微量元素硼对植物生长发育有着密切的关系。木里县多数苹果和梨树,植于瘠薄的山坡和河滩,天气干旱,管理粗放,普遍表现缺硼病症。严重缺硼的苹果树枝顶叶小、狭长、厚脆、簇生,有的无锯齿,皱缩枯萎。叶脉弯曲,叶色淡绿或失绿,呈褐色。叶柄变粗,褐色,早期落叶。节间变短,侧芽不发或发芽不久死亡(图1)。2—5年生大枝,阳面有泡状突起,纵剖皮层可见褐色小点,树皮呈不规则龟裂,反卷脱落。更严重的是多年生枝、主枝和主干表皮粗糙、呈疮疤状,木质部呈黑褐色,枝根腐烂,仅有
Trace elements boron on plant growth and development are closely related. Muli County, most of the apple and pear trees, planted in barren hills and floodplains, the weather was dry, extensive management, the general performance of boron deficiency disease. The severely boron-deficient apple tree has small, narrow, narrow-leafed, tufted, tufted, some jagged, shriveled-wilted leaves. Vein bending, leaf color light green or green, brown. Petiole thicker, brown, early leaves. Internodes shortened, lateral shoots or germinate shortly after death (Figure 1). 2-5 years old branches, the bubble-shaped surface of the sun, the longitudinal cortices can be seen brown dots, irregular bark was cracked, anti-roll off. More serious is the perennial branches, main branches and trunk epidermis rough, scars, xylem was dark brown, root rot, only