Abstract
Experiments were conducted in 1997 and 1999 to determine how long-term soil fertilization influences the performance of maize crop under water deficit on alluvial soil (sandy loam) at the Kyoto University Farm, Japan. The field had been applied large amounts of chemical fertilizer and/or farmyard manure since 1988 as four treatments, i. e., no fertilizer (NF), chemical fertilizer (CF), farmyard manure (MF) and chemical fertilizer + manure (CM) each with two replications. Water stress was imposed naturally in 1997 from 54 to 81 days after sowing (DAS). In 1999, water stress was imposed in one of the two replicate blocks artificially during 22-65 DAS by controlling irrigation under a rain shelter and another replicate block was well watered. Leaf area index and biomass in CM and MF were maintained higher than in CF and NF in both years under both water-stressed and well-watered conditions. With the progress of water stress, the major water depletion zone in the soil tended to shift deeper to a greater extent in MF and CM than in NF and CF. The total amount of water depleted from lOOcm-depth soil during the stress periods was larger in MF and CM than in NF and CF by 20 to 80 percent. Water-use efficiency (biomass production per total water depletion) was similar in CF, MF and CM with an average of 3.9 g kg–1 and it was lower in NF (1.8 g kg–1). Leaf conductance and photosynthetic rate during the stress period were higher in MF than in CF. The results indicated that water extraction during the stress period was greater in the plots manured for a long time, which resulted in well-maintained physiological activity and growth.
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Claims 9
Claim · model-written summary
CM maintained higher leaf area index and biomass than CF and NF.
- Treatment
- CMe0
- Outcome
- Leaf area index and biomasse0
- Direction
- highere0
- Qualifier
- both years under both water-stressed and well-watered conditionse0
- Comparator
- CF and NFe0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index and biomass in CM and MF were maintained higher than in CF and NF in both years under both water-stressed and well-watered conditions.”
t0“Maize”
Claim · model-written summary
MF maintained higher leaf area index and biomass than CF and NF.
- Treatment
- MFe0
- Outcome
- Leaf area index and biomasse0
- Direction
- highere0
- Qualifier
- both years under both water-stressed and well-watered conditionse0
- Comparator
- CF and NFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index and biomass in CM and MF were maintained higher than in CF and NF in both years under both water-stressed and well-watered conditions.”
t0“Maize”
Claim · model-written summary
The main soil water depletion zone shifted deeper in MF than NF and CF.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the major water depletion zone in the soil tended to shift deeper to a greater extent in MF and CM than in NF and CF.”
t0“Maize”
Claim · model-written summary
The main soil water depletion zone shifted deeper in CM than NF and CF.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the major water depletion zone in the soil tended to shift deeper to a greater extent in MF and CM than in NF and CF.”
t0“Maize”
Claim · model-written summary
MF depleted more water from the upper meter of soil than NF and CF.
- Treatment
- MFe0
- Outcome
- total amount of water depleted from lOOcm-depth soile0
- Direction
- largere0
- Value
- 20 to 80 percente0
- Comparator
- NF and CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total amount of water depleted from lOOcm-depth soil during the stress periods was larger in MF and CM than in NF and CF by 20 to 80 percent.”
t0“Maize”
Claim · model-written summary
CM depleted more water from the upper meter of soil than NF and CF.
- Treatment
- CMe0
- Outcome
- total amount of water depleted from lOOcm-depth soile0
- Direction
- largere0
- Value
- 20 to 80 percente0
- Comparator
- NF and CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total amount of water depleted from lOOcm-depth soil during the stress periods was larger in MF and CM than in NF and CF by 20 to 80 percent.”
t0“Maize”
Claim · model-written summary
Water-use efficiency was similar in CF, MF, and CM, averaging 3.9 g kg–1.
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water-use efficiency (biomass production per total water depletion) was similar in CF, MF and CM with an average of 3.9 g kg–1 and it was lower in NF (1.8 g kg–1).”
t0“Maize”
Claim · model-written summary
Water-use efficiency in NF was lower, at 1.8 g kg–1.
- Treatment
- NFe0
- Outcome
- Water-use efficiencye0
- Direction
- lowere0
- Value
- 1.8 g kg–1e0
- Comparator
- CF, MF and CMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water-use efficiency (biomass production per total water depletion) was similar in CF, MF and CM with an average of 3.9 g kg–1 and it was lower in NF (1.8 g kg–1).”
t0“Maize”
Claim · model-written summary
Leaf conductance and photosynthetic rate were higher in MF than CF during stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf conductance and photosynthetic rate during the stress period were higher in MF than in CF.”
t0“Maize”
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See all 1,365 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.