摘要: Boron deficiency has been diagnosed or predicted in a variety of plants using combination approaches including plant response to B fertiliser, symptoms, and soil analysis. Local knowledge soils, crops, factors known accentuate provide important background for its diagnosis prognosis. However, accurate prognosis depends on calibrated standards testing. For the part sampled needs reflect current supply, will therefore usually be an actively expanding such as young leaf. Soil analysis are probably more useful when used predict likelihood deficiency. Increased reliability prediction can achieved values particular type crop species combinations. In addition calibrating against yield responses, established pollen viability vigour, seed viability, fruit quality, root, stem tuber quality lignification wood could often B.