ISHS Acta Horticulturae 627: XXVI International Horticultural Congress: Toward Ecologically Sound Fertilization Strategies for Field Vegetable Production
DEVELOPMENT OF A NITROGEN MANAGEMENT TOOL FOR BROCCOLI |
| Author: | R. Karitonas |
| Keywords: | Broccoli, soil mineral nitrogen, tissue nitrate, foliar nitrogen concentration, nitrogen management tool |
| Abstract:
The soil mineral N, tissue NO3-N and foliar nutrition concentration tests were evaluated as a nitrogen management tool for broccoli production. Investigation showed that according to high yield data the optimal N supply is 240 kg N ha-1. It was established that when the content of total N in broccoli leaves is 26.1-31.3 g kg-1 dry wt, P – 3.3-4.6 g kg‑1, K – 23.6-31.1 g kg-1, Ca – 34.6-55.9 g kg-1 and Mg – 5.0-7.9 g kg-1, the production of broccoli heads is higher than 10 t ha-1. High yield crops were optimally supplied with nitrogen when NO3-N in leaves on the 27th day after transplanting was higher than 3500 mg kg-1, 46th – higher than 3000 mg kg-1, 59th – higher than 2000 mg kg-1. Good correlations were established on the: 27th day after transplanting between the N in leaves and NO3-N in soil (0-20 cm, 0-60 cm depth) r=0.74-0.75, 46th – between the NO3-N in leaves and NO3-N in soil (0-20 cm depth) r=0.59 and the N in leaves and NO3-N in soil (0-20 cm, 0-60 cm depth) r=0.68, r=0.6. In spring it is expedient to establish the amount of mineral nitrogen in soil and calculate the rate of nitrogen fertilizers accordingly. During broccoli vegetation it is expedient to assess plant supply with nutrients according to the level of mineral elements in leaves. | |
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