Abstract
The evaluation of potato response to controlled-release fertilizers (CRFs), as a sole source of nitrogen (N) or as a blend with a soluble N source, is essential to 1) develop the best management recommendations for using CRFs in potato production and 2) provide guidelines to CRF manufacturers for developing an optimal product. This study aimed to evaluate the potato yield and quality responses to N CRFs (polymer-coated urea [PCU]) vs soluble N sources. The experiments were conducted in major potato-growing regions in the United States and China. The current industry-recommended practice of 112 kg N/ha pre-plant soil broadcast of urea plus five in-season fertigations of 224 kg N/ha as urea ammonium nitrate (UAN-32) was compared to a single pre-plant application of 224 kg N/ha as a CRF as the sole source of N or as multiple blends of CRFs and soluble N sources (i.e., urea) at various ratios. The results demonstrated that petiole nitrate_N (NO 3 _N) levels and tuber yield with single pre-plant broadcast applications of 224 kg N/ha as CRF/urea blends (ratio of 25/75 or 50/50) were similar to those obtained with industry-standard N management practice. N uptake and yield were significantly greater with 220 kg/ha N as the CRF than those with the same N rate as urea. Unlike the current potato industry N practice, using CRFs as either a sole source of N or blended with urea reduces the total N rate and application frequency.
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Claims 4
Claim · model-written summary
Single pre-plant applications of 224 kg N/ha as CRF/urea blends gave tuber yield similar to the industry-standard practice.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- 224 kg N/ha as CRF/urea blendse1
- Outcome
- tuber yielde1
- Direction
- similare1
- Comparator
- industry-standard N management practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“for potato sustainable nitrogen management”
e1“The results demonstrated that petiole nitrate_N (NO 3 _N) levels and tuber yield with single pre-plant broadcast applications of 224 kg N/ha as CRF/urea blends (ratio of 25/75 or 50/50) were similar to those obtained with industry-standard N management practice”
Claim · model-written summary
Single pre-plant applications of 224 kg N/ha as CRF/urea blends gave petiole nitrate-N levels similar to the industry-standard practice.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 224 kg N/ha as CRF/urea blendse1
- Outcome
- petiole nitrate_N (NO 3 _N) levelse1
- Direction
- similare1
- Comparator
- industry-standard N management practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“for potato sustainable nitrogen management”
e1“The results demonstrated that petiole nitrate_N (NO 3 _N) levels and tuber yield with single pre-plant broadcast applications of 224 kg N/ha as CRF/urea blends (ratio of 25/75 or 50/50) were similar to those obtained with industry-standard N management practice”
Claim · model-written summary
N uptake and yield were significantly greater with 220 kg/ha N as CRF than with the same N rate as urea.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 220 kg/ha N as the CRFe2
- Outcome
- N uptake and yielde2
- Direction
- significantly greatere2
- Comparator
- the same N rate as ureae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“for potato sustainable nitrogen management”
e2“N uptake and yield were significantly greater with 220 kg/ha N as the CRF than those with the same N rate as urea”
Claim · model-written summary
Using CRFs alone or blended with urea reduces the total N rate and application frequency compared with current potato industry practice.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- using CRFs as either a sole source of N or blended with ureae3
- Outcome
- total N rate and application frequencye3
- Direction
- reducese3
- Comparator
- current potato industry N practicee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“for potato sustainable nitrogen management”
e3“Unlike the current potato industry N practice, using CRFs as either a sole source of N or blended with urea reduces the total N rate and application frequency”
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