Abstract
Abstract Soil testing and plant tissue nutrient concentrations form the basis for fertilizer recommendations in Ohio. The response of crop phosphorus (P) and potassium (K) nutrient concentrations to soil test levels and fertilizer applications influences fertilizer recommendations but have not been rigorously evaluated in this region. The objective of our study was to determine the effects of (a) soil test P and K levels and (b) P and K fertilization on mid‐season leaf and grain P and K concentrations of corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.). From 2014–2018, we conducted 186 on‐farm trials (99 P, 87 K trials) over a diversity of soil types, crop genetics, and management histories in 39 counties throughout Ohio. Soil test P and K levels, mid‐season leaf P and K concentrations, and grain P and K concentrations were measured on randomized and replicated plots. Both leaf and grain nutrient concentrations generally increased with the soil test levels, but the relationships were weak in all three crops. Fertilization of P and K marginally but consistently increased leaf tissue concentrations in all crops but had a lesser effect on grain P and K concentrations. Our data suggest that current sufficiency ranges for corn, soybean, and wheat are too high and need revision. Collectively, our results show that crop P and K tissue concentrations are positively, but weakly related to soil test levels and fertilization, and this information has important implications for future development of nutrient management frameworks in Ohio.
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Claims 4
Claim · model-written summary
Leaf and grain nutrient concentrations generally increased with soil test levels, but weakly.
- Taxon
- corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)
Glycine max
Triticum aestivum
Zea mayse1 - Outcome
- leaf and grain nutrient concentrationse0
- Direction
- increasede0
- Comparator
- soil test levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both leaf and grain nutrient concentrations generally increased with the soil test levels, but the relationships were weak in all three crops.”
e1“corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)”
Claim · model-written summary
P and K fertilization marginally increased leaf tissue nutrients.
- Taxon
- corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)Glycine maxTriticum aestivumZea mayse1
- Treatment
- Fertilization of P and Ke0
- Outcome
- leaf tissue concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization of P and K marginally but consistently increased leaf tissue concentrations in all crops”
e1“corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)”
Claim · model-written summary
P and K fertilization had a lesser effect on grain nutrients.
- Taxon
- corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)Glycine maxTriticum aestivumZea mayse1
- Treatment
- Fertilization of P and Ke0
- Outcome
- grain P and K concentrationse0
- Direction
- lessere0
- Comparator
- leaf tissue concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization of P and K marginally but consistently increased leaf tissue concentrations in all crops but had a lesser effect on grain P and K concentrations.”
e1“corn ( Zea mays L.), soybean [ Glycine max (L.) Merr.], and wheat ( Triticum aestivum L.)”
Claim · model-written summary
The authors recommend revising crop sufficiency ranges downward.
- Taxon
- corn, soybean, and wheatGlycine maxTriticum aestivum
Zea mays subsp. mayse0 - Outcome
- sufficiency rangese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“current sufficiency ranges for corn, soybean, and wheat are too high and need revision”
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See all 959 papers →8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.