Abstract
Two pot experiments were carried out under controlled environment conditions in the laboratory. One was to assess the ability of alfalfa pellets to supply plant available N as an organic fertilizer. The other was to investigate the impact of applying glycerol on crop growth and soil characteristics. In the first experiment 4 different rates of two types of alfalfa pellets were tested by comparing with urea. In the glycerol addition experiment, four different rates of glycerol were tested. Wheat biomass yield, N and P uptake were measured in both experiments. Soil organic C, available N and P were also measured in the glycerol experiment. Results from the alfalfa pellet experiment showed that application of alfalfa pellets lead to a significant wheat biomass yield response and an increase in N and P uptake, even at the lowest application rates. Glycerol addition increased wheat yield biomass and N uptake at low and medium rates (100 and 1000 kg /ha) but resulted in reduced yield at the highest rate (10,000 kg/ha). The yield reductions at the highest rates were believed to be associated with N immobilization. In general, negative impacts on wheat growth were observed only at higher rates. Higher rates of glycerol added to the soil led to an increase in soil organic C concentration and a decrease in soil extractable nitrogen and phosphorus. Future experiments with glycerol addition will evaluate the effect of combination of glycerol with commercial fertilizer urea, and its effects on microbial respiration.
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Claims 8
Claim · model-written summary
Alfalfa pellets significantly increased wheat biomass yield even at the lowest rates.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- alfalfa pelletse0
- Outcome
- wheat biomass yielde0
- Direction
- increasee0
- Qualifier
- even at the lowest application ratese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of alfalfa pellets lead to a significant wheat biomass yield response and an increase in N and P uptake, even at the lowest application rates.”
t0“wheat”
Claim · model-written summary
Alfalfa pellets increased wheat nitrogen and phosphorus uptake even at the lowest rates.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- alfalfa pelletse0
- Outcome
- N and P uptakee0
- Direction
- increasee0
- Qualifier
- even at the lowest application ratese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of alfalfa pellets lead to a significant wheat biomass yield response and an increase in N and P uptake, even at the lowest application rates.”
t0“wheat”
Claim · model-written summary
Glycerol at low and medium rates increased wheat biomass yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Glycerol additione0
- Outcome
- wheat yield biomasse0
- Direction
- increasede0
- Qualifier
- low and medium rates (100 and 1000 kg /ha)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycerol addition increased wheat yield biomass and N uptake at low and medium rates (100 and 1000 kg /ha) but resulted in reduced yield at the highest rate (10,000 kg/ha).”
Claim · model-written summary
Glycerol at low and medium rates increased wheat nitrogen uptake.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Glycerol additione0
- Outcome
- N uptakee0
- Direction
- increasede0
- Qualifier
- low and medium rates (100 and 1000 kg /ha)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycerol addition increased wheat yield biomass and N uptake at low and medium rates (100 and 1000 kg /ha) but resulted in reduced yield at the highest rate (10,000 kg/ha).”
Claim · model-written summary
Glycerol at 10,000 kg/ha reduced wheat yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Glycerol additione0
- Outcome
- yielde0
- Direction
- reducede0
- Qualifier
- highest rate (10,000 kg/ha)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycerol addition increased wheat yield biomass and N uptake at low and medium rates (100 and 1000 kg /ha) but resulted in reduced yield at the highest rate (10,000 kg/ha).”
Claim · model-written summary
The authors attributed reduced wheat yield at high glycerol rates to nitrogen immobilization.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- yield reductionse0
- Qualifier
- N immobilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield reductions at the highest rates were believed to be associated with N immobilization.”
t0“wheat”
Claim · model-written summary
Higher glycerol rates increased soil organic carbon concentration.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Higher rates of glycerole0
- Outcome
- soil organic C concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher rates of glycerol added to the soil led to an increase in soil organic C concentration and a decrease in soil extractable nitrogen and phosphorus.”
t0“wheat”
Claim · model-written summary
Higher glycerol rates decreased soil extractable nitrogen and phosphorus.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Higher rates of glycerole0
- Outcome
- soil extractable nitrogen and phosphoruse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher rates of glycerol added to the soil led to an increase in soil organic C concentration and a decrease in soil extractable nitrogen and phosphorus.”
t0“wheat”
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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.