ISHS Acta Horticulturae 339: Workshop on Ecological Aspects of Vegetable Fertilization in Integrated Crop Production in the Field
SLOW RELEASE FERTILIZERS ON ORGANIC CARRIERS AS THE SOURCE OF N FOR VEGETABLE CROPS PRODUCTION IN THE OPEN FIELD |
| Authors: | E. Kolota, A. Beresniewicz, J. Krezel, O. Nowosielski |
| Keywords: | Nitrogen sources, yield of vegetables, N uptake |
| Abstract:
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 (rN = 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 (rN = 1.3 %) was only a slightly less efficient N source in the first year, but gave better results than two other Mono fertilizers (rN = 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 (rN = 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 rN = 1.3 %, | |
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