SLOW RELEASE FERTILIZERS ON ORGANIC CARRIERS AS THE SOURCE OF N FOR VEGETABLE CROPS PRODUCTION IN THE OPEN FIELD

In a four-year crop rotation consisting of white cabbage, onion, red beet and cabbage the slow release N fertilizers type Mono with different dissolving coefficients (r_N = 1.3 %, 5.0 %, 10.0 %) as well as mixtures of these compounds were supplied in advance at 500 and 1000 kg N/ha.
The efficiency was compared with ammonium nitrate and urea used annually at 200 kg N/ha for cabbage and 150 kg N/ha for onion and red beet.

Analysis of the data from the study showed that Mono fertilizer I (r_N = 1.3 %) was only a slightly less efficient N source in the first year, but gave better results than two other Mono fertilizers (r_N = 5.0 % and 10.0 %) in the last two crops.
The promising source of N for vegetable crops appeared to be mixed fertilizer C comprising Mono fertilizers II and III (r_N = 5.0% and 10.0 %) in equal ratios.
Its application at the rate of 1000 kg N/ha generally ensured similar yields of vegetables during the four-year crop rotation compared to ammonium nitrate or urea applied annually at recommended amounts.
Mixed fertilizer A containing compounds with dissolving coefficient r_N = 1.3 %,

Workshop on Ecological Aspects of Vegetable Fertilization in Integrated Crop Production in the Field

E. Kolota, A. Beresniewicz, J. Krezel, O. Nowosielski

Nitrogen sources, yield of vegetables, N uptake

https://doi.org/10.17660/ActaHortic.1993.339.21