Abstract
The effects of long-term fertilization on soil properties and nutrient availability are not well documented for cassava cultivation in Vietnam. In 1990, a field research plots were established with 12 treatments to test the effect of different rates of nitrogen (N), phosphorus (P) and potassium (K) on soil properties in Acrisols at Thai Nguyen University in Northern Vietnam. In 1999, composite soil samples (0 to 20cm depth) were collected from eight selected plots for measurements of nutrient supply rates by ion exchange membrane probes and for growing corn and canola in a growth chamber with and without added lime. Generally, long-term nitrogen (N) fertilization increased available N supply rates but decreased available potassium (K) and magnesium (Mg). Long-term phosphorus(P) applications increased canola N, calcium (Ca) and Mg uptake. Canola P uptake increased with increased P rates only when lime was added. Long-term K applications increased canola N, K, Ca, Mg uptake but only significantly increased corn N uptake. Liming significantly increased uptake of N, P, K, Ca, Mg and S for both corn and canola. However, N N, K and Mg soil supply rates were reduced when lime was added, due to competition between Ca from the added lime and other nutrients.
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Claims 9
Claim · model-written summary
Long-term nitrogen fertilization increased soil N supply and decreased soil K and Mg availability.
- Taxon
- corn and canola
.jpg?width=60)
Brassica napus var. napus
Zea mays subsp. mayst0 - Treatment
- nitrogen (N) fertilizatione0
- Outcome
- available N supply ratese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“long-term nitrogen (N) fertilization increased available N supply rates but decreased available potassium (K) and magnesium (Mg)”
t0“Corn and Canola”
Claim · model-written summary
Long-term nitrogen fertilization decreased available potassium and magnesium.
- Taxon
- corn and canolaBrassica napus var. napusZea mays subsp. mayst0
- Treatment
- nitrogen (N) fertilizatione0
- Outcome
- available potassium (K) and magnesium (Mg)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“long-term nitrogen (N) fertilization increased available N supply rates but decreased available potassium (K) and magnesium (Mg)”
t0“Corn and Canola”
Claim · model-written summary
Long-term phosphorus application increased canola uptake of N, calcium and Mg.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- phosphorus(P) applicationse0
- Outcome
- canola N, calcium (Ca) and Mg uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long-term phosphorus(P) applications increased canola N, calcium (Ca) and Mg uptake”
Claim · model-written summary
Canola P uptake increased with P rate only when lime was added.
- Taxon
- CanolaBrassica napus var. napuse0
- Treatment
- increased P ratese0
- Outcome
- P uptakee0
- Direction
- increasede0
- Qualifier
- only when lime was addede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canola P uptake increased with increased P rates only when lime was added”
Claim · model-written summary
Long-term K application increased canola uptake of N, K and Ca.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Long-term K applicationse0
- Outcome
- canola N, K, Ca, Mg uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long-term K applications increased canola N, K, Ca, Mg uptake”
Claim · model-written summary
Long-term K application significantly increased corn N uptake.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Long-term K applicationse0
- Outcome
- corn N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long-term K applications increased canola N, K, Ca, Mg uptake but only significantly increased corn N uptake”
Claim · model-written summary
Liming significantly increased N, P and K uptake in corn and canola.
- Taxon
- corn and canolaBrassica napus var. napusZea mays subsp. mayse0
- Treatment
- Liminge0
- Outcome
- uptake of N, P, K, Ca, Mg and Se0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Liming significantly increased uptake of N, P, K, Ca, Mg and S for both corn and canola”
Claim · model-written summary
Lime reduced soil N, K and Mg supply rates.
- Taxon
- corn and canolaBrassica napus var. napusZea mays subsp. mayst0
- Treatment
- lime was addede0
- Outcome
- N N, K and Mg soil supply ratese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N N, K and Mg soil supply rates were reduced when lime was added”
t0“Corn and Canola”
Claim · model-written summary
The authors attributed the reduced supply rates to competition between lime-derived Ca and other nutrients.
- Taxon
- corn and canolaBrassica napus var. napusZea mays subsp. mayst0
- Treatment
- added limee0
- Outcome
- competition between Ca from the added lime and other nutrientse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“due to competition between Ca from the added lime and other nutrients”
t0“Corn and Canola”
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See all 339 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.