Abstract
SummaryThe molybdenum requirement of cauliflower in relation to form of nitrogen supply was reinvestigated using a sterile culture technique to study effects of nitrification where nitrogen was supplied in a reduced form. Plants grown under sterile conditions with ammonium sulphate and in the absence of molybdenum showed no abnormality, and were comparable with those grown with complete nutrient and ammonium sulphate or nitrate. In the absence of molybdenum with ammonium sulphate under non-sterile conditions, or with nitrate, the “whiptail” abnormality appeared.It is concluded that the molybdenum requirement formerly observed with reduced nitrogen compounds, as well as with nitrate, may be associated with the effect of nitrate as a de-repressor of nitrate reductase. When nitrate is excluded, molybdenum may not be required by cauliflower grown with ammonium sulphate.
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