Sulfur-coated Urea as a Slow-release Nitrogen Source for Onions

Brown, B. D.; Hornbacher, A.J.; Naylor, D. V.

doi:10.21273/jashs.113.6.864

Cited by 29 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the NPK treatments, N uptake in the bulb was higher in the 3-split application than in the single application while C, N, P K, S, Ca and Mg contents in the leaf were higher in the single application than in the 3-split application. Brown et al (1988) reported that increased yields with sulfur-coated urea compared to pre-plant urea at low N application rates, but not at high application rates. In their study, the high application rate exceeded total N uptake by approximately 100 kg ha -1 .…”

Section: Resultsmentioning

confidence: 99%

“…The CRFs are expected to be most effective in conditions to accelerate mineralization of nutrients such as excessive rainfall or irrigation (Morgan et al, 2009). Onion bulb yields increased with sulfur-coated urea compared to pre-plant urea at low N application rates, but not at high application rates (Brown et al, 1988). In their study, high application rate exceeded total N uptake by approximately 100 kg ha -1 , indicating the high N application rate was excessive.…”

Section: Introductionmentioning

confidence: 93%

See 1 more Smart Citation

Evaluation of Controlled Release Fertilizer on Bulb Yield, Nutrient Content, and Storage Quality of Overwintering Intermediate-Day Onions

Min¹

2022

Korean J. Soil. Sci. Fert.

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Evaluation of Controlled Release Fertilizer on Bulb Yield, Nutrient Content, and Storage Quality of Overwintering Intermediate-Day Onions

Min¹

2022

Korean J. Soil. Sci. Fert.

View full text Add to dashboard Cite

show abstract

“…Later research found that preplant SCU often produced yields equal to that produced in treatments receiving split applications of soluble N (Brown et al, 1988), especially in conditions where nutrient leaching was a concern (Waddell et al, 1999(Waddell et al, , 2000. For example, when SCU was applied to potato (Solanum tuberosum) as a single application 1 month after planting, yield of potato from SCU-treated plots was equal to that obtained from urea-treated plots in 2 of 3 years (Liegel and Walsh, 1976).…”

Section: Materials That Are Slow Release Due To Reactionmentioning

confidence: 99%

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

Guertal

2009

hortte

View full text Add to dashboard Cite

Slow-release nitrogen (N) fertilizers offer many potential benefits for vegetable production. In sandy soils, their use may lessen N leaching. If the slow-release fertilizer has a release pattern that matches crop needs, N uptake by the growing crop may become more efficient. Additionally, if slow-release fertilizers can be applied as a preplant application, production costs could be lessened, eliminating the need for multiple applications of soluble N fertilizer. Synthetic slow-release fertilizers can be separated into two general groups: those that are slow release as a byproduct of a chemical reaction (such as urea-formaldehyde), and those that are slow release via a sulfur, wax, or resin coating around the fertilizer prill. In vegetable crop research, much of the available literature has focused on use of sulfur coat urea and urea-formaldehyde, as they have been in the fertilizer market for 40 years. Newer research has evaluated resin-coated products. In most studies, use of slow-release N fertilizers as a preplant treatment did not decrease crop yield, but yield was rarely increased when compared with standard split applications of soluble N. Based on available research, the benefits of using slow-release N fertilizers in vegetable crop production will come from reduced environmental risk and savings in production costs.

show abstract

Ammonium nitrate fertility levels influence flavour development in hydroponically grown ‘Granex 33’ onion

Coolong

Randle

2003

J Sci Food Agric

View full text Add to dashboard Cite

High levels of nitrogen (N) fertility have been shown to influence bulb flavour characteristics in onion (Allium cepa L). To test the effects of lower levels of N fertility on onion bulb flavour, 'Granex 33' onions were grown hydroponically in a greenhouse with varying solution N levels. Eleven levels were tested by increasing the concentration of NH 4 NO 3 in solutions from 20 to 140 mg l −1 N. Mature plants were harvested and evaluated for plant leaf and bulb fresh weights (FWs), bulb soluble solids content (SSC), bulb total pyruvic acid, bulb total sulphur (S), and bulb sulphate (SO 4 2− ). To determine the effect of N on the flavour biosynthetic pathway of onion, total and individual S-alk(en)yl cysteine sulphoxides and related peptide intermediates were also tested. Leaf and bulb FWs responded quadratically to N concentration, as did total bulb S. Bulb SO 4 2− and SSC, though significantly influenced by N concentration, did not respond with a meaningful trend. Bulb pyruvic acid increased linearly with N level increases, as did (+)-S-propyl-L-cysteine sulphoxide. Total precursors, (+)-S-methyl-Lcysteine sulphoxide, and trans-(+)-S-1-propenyl-L-cysteine sulphoxide responded quadratically to N levels. At lower N levels, trans-(+)-S-1-propenyl-L-cysteine sulphoxide content was highest relative to the other precursors. However, at elevated N levels, (+)-S-methyl-L-cysteine sulphoxide accumulated in the highest concentrations. Peptide intermediates 2-carboxypropyl glutathione and γ -glutamyl propenyl cysteine sulphoxide responded linearly and quadratically respectively to increasing N fertility levels. Nitrogen fertility levels can influence flavour intensity and quality and should be considered when growing onions for flavour attributes.

show abstract

Sulfur-coated Urea as a Slow-release Nitrogen Source for Onions

Cited by 29 publications

References 10 publications

Evaluation of Controlled Release Fertilizer on Bulb Yield, Nutrient Content, and Storage Quality of Overwintering Intermediate-Day Onions

Evaluation of Controlled Release Fertilizer on Bulb Yield, Nutrient Content, and Storage Quality of Overwintering Intermediate-Day Onions

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

Ammonium nitrate fertility levels influence flavour development in hydroponically grown ‘Granex 33’ onion

Contact Info

Product

Resources

About