NUTRITIONAL EFFECTS ON ONION (ALLIUM CEPA L) YIELD AND QUALITY

J.C. Laughlin
This paper deals with the yield and quality effects of nitrogen (N), phosphorus (P) and potassium (K) fertilisers with emphasis on the method and timing of N application. In a spring sown field experiment factorial combinations of zero, 50, 100 and 200 kg/ha of both N and P were banded at drilling. The N fertiliser had no effect on either yield or quality but P increased bulb yield by 27% and also increased storage rots. In an autumn sown experiment, N as ammonium nitrate was top dressed at zero, 50, 100, 200 and 400 kg N/ha in mid July, mid September or mid November and compared with 50 kg N/ha banded at drilling. Similar bulb yield increases of 26% were given by top dressing 50 kg N/ha at all times of application with no further increases at higher rates. Banded N had no effect on yield and there were no detrimental effects of top dressed N on quality. A second autumn drilled experiment investigated the yield response of onions to soil K levels ranging from 180 to 260 ppm and the influence of top dressed ammonium nitrate at 50 kg N/ha on the response. There was no response to soil K without top dressed N but in the presence of top dressed N, bulb yield increased by up to 50% at 240 ppm soil K. There were no quality effects from any K treatment.
Laughlin, J.C. (1989). NUTRITIONAL EFFECTS ON ONION (ALLIUM CEPA L) YIELD AND QUALITY. Acta Hortic. 247, 211-216
DOI: 10.17660/ActaHortic.1989.247.39
https://doi.org/10.17660/ActaHortic.1989.247.39

Acta Horticulturae