EFFECT OF AVAILABLE SOIL NITROGEN ON YIELDS AND RESPONSE OF BRUSSELS SPROUTS TO APPLIED NITROGEN IN THE FIELD

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Abstract
Determination of nitrate nitrogen in the soil at transplanting time was the best soil test for prediction of yield potential and relative response of Brussels sprouts (Brassica oleracea var. gemmifera DC, Jade Cross) to applied nitrogen. Actual fertilizer nitrogen requirement of a soil could not be predicted from soil tests. Total soil nitrogen was the best alternative to original soil nitrate for prediction of yield potential of the soil. Total nitrogen in leaf tissue from maximum-yielding plots averaged 5.6%. Approximately 5.2% tissue nitrogen was necessary for good yields. Concentration of nitrogen in leaf tissue from control plots could not be predicted from soil tests for available nitrogen. Over a period of three years at four locations per year, 67 kg nitrogen per ha applied in bands was adequate for maximum yields of Brussels sprouts at most locations.