Effect of reduced fertilizer nitrogen application rates on yield and nitrogen recovery of sugar beet and potatoes.
DOI:
https://doi.org/10.18174/njas.v37i3.16634Abstract
Data from 150 sugarbeet and 98 potato field trials in the Netherlands were used to calculate the effects on yield and N recovery of applying 0-90% of recommended N fertilizer rates. Av. sugarbeet root tuber yields were 63.8, 63.5, 62.9, 61.2 and 53.3 t/ha with 100, 90, 75, 50 and 0% of recommended N rate, resp.; corresponding potato tuber yields were 56.8, 56.5, 55.9, 54.4 and 45.1 t. Av. fertilizer N recovery by potato tubers ranged from 33.2% with the recommended N rate to 44.3% with 50% of the recommended N rate. On the assumption that the probability of serious yield deficits should not exceed 5%, current recommended N rates could not be reduced for sugarbeet but could be reduced by 25% for potatoes giving an av. yield deficit of 1.7% and 40% fertilizer N recovery by tubers. The effects of changes in the ratio of fertilizer cost to the price of produce is discussed. (Abstract retrieved from CAB Abstracts by CABI’s permission)Downloads
Published
1989-09-01
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