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Description
A four-year trial studied the effects of N fertilizer timing and rate on Barbers, Grenache, French Colombard, and Chenin blanc under furrow irrigation. Treatments were: (1) control, intermediate rate (56 kg N/ha) at bud break, fruit set, veraison, and post harvest, and high rate (102 kg N/ha) at bud break; (2) vine N status, as determined by petiole N03-N and NH4-N was highest in Grenache, lowest in Barbera, and intermediate in French Colombard and Chenin blanc. Generally, N rate influenced N status the most. N timing differences were minor except for post harvest sometimes contributing higher bloom N levels than bud break. Petiole NO -N was more sensitive than NH4-N to treatments; their sum (total inorganic N) also showed diagnostic potential. N treatment generally decreased grape soluble solids, irrespective of timing, and especially at the high N rate. N increased yield only in Grenache, the most responsive cultivar to N overall. Negative effects ofveraison timing on fruit composition and yield would question its choice of application. The petiole NO 3 -N levels reported may be of diagnostic value for the individual cultivars.
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