ISHS Acta Horticulturae 627: XXVI International Horticultural Congress: Toward Ecologically Sound Fertilization Strategies for Field Vegetable Production
INFLUENCE OF FERTILIZATION ON EARLY SAVOY CABBAGE YIELD |
| Authors: | Z. Lončarić, T. Teklić, N. Paradjiković, I. Jug |
| Keywords: | Brassica oleracea L. var sabauda, chemical composition, dry matter, nitrogen, phosphorus, potassium, nutrients removal |
| Abstract:
The field experiments were carried out during three years (1999-2001) on two localities in eastern Croatia to determine the fertilization influence on yield of early Savoy cabbage ( Brassica oleracea L. var. sabauda). The experiments were conducted in 1999 and 2001 with five N-fertilization levels (without fertilizer, N1PK, N2PK, N3PK and N4PK) and in 2000 and 2001 with five fertilizer levels (without fertilizer, N1, N2, N2P1K1 and N2P2K2). Yields were measured for each of 4 replicates. Yields of Savoy cabbage heads (fresh matter) were 29-31 t ha-1 without fertilizer and 56-59 t ha-1 with highest fertilization. The average weights of Savoy cabbage heads were 469 to 947 g, dry matter content of heads 101 (no fertilizer) to 69 g kg -1 on highest fertilized plots. Total DM production was from 4.6 t ha-1 on control plots to about 7 t ha-1 on highest fertilization with removal of 100-206 kg N ha-1, 43-73 kg P2O5 ha-1 and 161-261 kg K2O ha-1. According to yield increase, total above ground mass and head weight, the optimum nitrogen fertilizer dose for Savoy cabbage is between 200 and 300 kg ha-1. The yield response to fertilization was higher on soil with lower Nmin, P and K contents before fertilization. Results of higher N fertilizer dose were higher yield, N contents and removal, but doubled dose of P and K fertilizer did not affected yield. Increased fertilization resulted in lower DM content but higher DM production. Nutrient removal per ton of head yield was the highest for potassium (4.2-5.6 kg K2O) followed by nitrogen (3.3-3.5 kg N) and the lowest for phosphorus (1.2-1.5 kg P2O5). Crop residues of Savoy cabbage contain 42-83 kg N ha-1, 13 – 24 kg P2O5 ha-1 and 51 – 96 kg K2O ha-1 | |
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