Abstract
Abstract Foliar fertilization of soybeans ( Glycine max (L.) Merr.) with N, P, K and S during the seed‐filling period promises to increase soybean yields. Such foliar applications could be used to avoid the depletion of these nutrients in the leaves and the resulting reduction in photosynthetic rate during this period due to poor nutrient uptake from the soil and translocation of these elements from the leaves to the developing seeds. Field experiments were conducted to test this hypothesis by spraying soybeans with solutions of N, P, K, and/or S in different proportions and at different times and rates. We supplied N primarily as urea, P primarily as poly‐phosphate, K with the P as potassium polyphosphate or with the S as potassium sulfate. Very significant yield increases were obtained from two to four sprayings on different soybean cultivars at different experimental sites between developmental stages R5 and R7. The optimum proportion of N:P:K:S in the solution 10:1:3:0.5. a proportion similar to that of these elements in the seeds. The optimum rate of total nutrient application was about 80 + 8 + 24 + 4 kg/ha of N + P + K + S, respectively. Yield increases were due to increases in numbers of harvestable seeds, not seed size. The results indicate that foliar fertilization during the seed‐filling period can become a very practical method for increasing soybean yields.
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Claims 6
Claim · model-written summary
Two to four foliar sprayings during stages R5 to R7 significantly increased soybean yield across cultivars and sites.
- Taxon
- Soybeans
Glycine maxt0 - Organ / stage
- developmental stages R5 and R7e0
- Treatment
- two to four sprayingse0
- Outcome
- yielde0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Very significant yield increases were obtained from two to four sprayings on different soybean cultivars at different experimental sites between developmental stages R5 and R7”
t0“Soybeans”
Claim · model-written summary
The optimum foliar solution proportion was N:P:K:S of 10:1:3:0.5.
- Taxon
- SoybeansGlycine maxt0
- Outcome
- optimum proportion of N:P:K:Se0
- Value
- 10:1:3:0.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum proportion of N:P:K:S in the solution 10:1:3:0.5”
t0“Soybeans”
Claim · model-written summary
The optimum total nutrient application rate was about 80 + 8 + 24 + 4 kg/ha of N + P + K + S.
- Taxon
- SoybeansGlycine maxt0
- Outcome
- optimum rate of total nutrient applicatione0
- Value
- 80 + 8 + 24 + 4 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum rate of total nutrient application was about 80 + 8 + 24 + 4 kg/ha of N + P + K + S, respectively”
t0“Soybeans”
Claim · model-written summary
The yield increase was attributable to more harvestable seeds.
- Taxon
- SoybeansGlycine maxt0
- Organ / stage
- harvestable seedse0
- Outcome
- Yield increasese0
- Qualifier
- increases in numbers of harvestable seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield increases were due to increases in numbers of harvestable seeds, not seed size”
t0“Soybeans”
Claim · model-written summary
Seed size did not account for the soybean yield increase.
- Taxon
- SoybeansGlycine maxt0
- Outcome
- seed sizee0
- Direction
- not seed sizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield increases were due to increases in numbers of harvestable seeds, not seed size”
t0“Soybeans”
Claim · model-written summary
The authors conclude that foliar fertilization during seed filling can be practical for increasing soybean yield.
- Taxon
- SoybeansGlycine maxt0
- Outcome
- foliar fertilization during the seed‐filling periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar fertilization during the seed‐filling period can become a very practical method for increasing soybean yields”
t0“Soybeans”
The same questions in other papers
application · yield · Glycine max (soybean)Positive and negative results
331 papers in the same direction as this paper · 66 in the opposite direction · 6 reporting no difference from an alternative
- no effect
- no effect
- negative
400 papers more in this group
See all 404 papers →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.