Based on a total season N recommendation of 125 or 150 lbs. actual N/acre with 50 lbs. N/acre applied preplant and the remaining N (125-50 = 75 lbs.) divided into equal amounts to be fertigated on a weekly basis (75 lbs. ¸ 13 weeks = 5 lbs. 12 oz. N per week). The doses for 1000 plants are based on a plant population of 4,200 plants/acre (i.e., rows on 6 ft. centers in 5-row blocks and plants 18 in. apart). Either the moderate (75 lb.) or high 100 lb.) N rate can be selected below. For seasons extending beyond 13 weeks a maintenance dose of 1 to 1.5 lbs. N/week is adequate.
|
Total Fertigated N Requirement [2] |
Actual N/week (lbs/A) |
Ammonium nitrate (lbs/A/wk) |
Ammonium nitrate (lbs per 1000 plants/wk) |
Calcium nitrate (lbs/A/wk) |
Calcium nitrate (lbs per 1000 plants/wk) |
|
75 lbs/A |
5 lbs. 12oz. |
17 |
4 |
37 |
8 lbs. 14oz. |
|
100 lbs/A |
7 lbs. 11oz. |
23 |
5 lbs. 8oz. |
50 |
11 lbs. 13oz. |
[1]
Adapted from Commercial Vegetable Crop Recommendation 1998-99. Eds.
B. Rowell et al. Cooperative Extension Service, University of Kentucky,
College of Agriculture, Frankfort, KY.
[2]
Fertigation can begin 14 days after transplanting and assumes 30-50
lbs. N/acre was applied preplant and starter fertilizer was used.