Evaluation of Controlled Release Fertilizer on Bulb Yield, Nutrient Content, and Storage Quality of Overwintering Intermediate-Day Onions
Year: 2022
Type: article
Abstract: Controlled release fertilizer (CRF) can delay its availability for plant uptake and increase fertilizer use efficiency, which might be useful for overwintering onion (Allium cepa L.) which has a growing season of 7 to 8 months.The study was performed to evaluate the effect of CRF on bulb yield, nutrient content, and storage quality of intermediate-day onions in onion growers' fields during the 2013/2014 and 2014/2015 growing seasons.The formulation of CRF used was 18N-3.1P-7.5K,and as an N source, 50% polymer-coated urea-N and 50% urea-N plus diammonium phosphate-N were blended.Treatments included CRF 25%, CRF 50%, CRF 100%, or CRF 150% based on the soil test recommended N rate.Separated NPK fertilizers of single application (NPK once), three-split application (NPK 3-split) and non-fertilized plot were checks.Soil NO 3 -N content in all CRF treatments and NPK once peaked at 133 days after transplanting.Marketable bulb yields for NPK once and CRF 150% was 66.12 Mg ha -1 and 65.67 Mg ha -1 , respectively, on a 2-year average, which were not significantly greater than CRF 50%, CRF 100%, and NPK 3-split.Most nutrient uptakes in the bulb were not different among all treatments except for no fertilization.Apparent nutrient recovery of CRF 25% was 32.5% in N, 20.9% in P, and 76.1% in K on a 2-year average, approximately twice that of CRF 100%.Total flavonoids content was higher in CRF 25% than in other treatments.The 50% reduced CRF rate based on the soil test recommended N rate should satisfy crop demand of available nutrients when electric conductivity was more than 1.5 dS m -1 and organic matter was 35 g kg -1 in preplant soil.
Source: 한국토양비료학회지
Authors: Jongtae Lee, Byeonggyu Min
Language: English
Subfield: Agronomy and Crop Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W4311118055