Abstract
Resources use efficiency of rice crop was studied under irrigated semiarid conditions. Two field experiments were conducted at the Experimental Farm, University of Agriculture, Faisalabad (UAF), Pakistan (latitude 31o25´N, longitude 73o09´E, and altitude 184.4 m from sea level), for two years. Variables in the study include viz. three population densities, five nitrogen fertilizer rates in the first experiment and similarly three population densities and five irrigation regimes in the second experiment. For these resources, radiation interception and radiation conversion efficiency (RCE = ), water use and water use efficiency (WUE = w), agronomic nitrogen use efficiency (ANUE = an) and economic nitrogen use efficiency (ENUE = en) were estimated. Relationships were also studied among various resources. Particularly RCE () and WUE (w) were estimated by two approaches. The results revealed in experiment that cumulative intercepted photosynthetically active radiation (CIPAR) varied from 990 to 1016 MJ m -2 in various nitrogen fertilizer levels. Plant density did not affect significantly RCE in both the seasons and it ranged from 1.26 to 1.28 g MJ-1 among different densities. Averaged over the two years data mean RCE for cumulative above-ground total dry matter (CATDM) ranged from 1.15 to 1.36 g MJ -1 among different fertilizer levels. The results depicted in Experiment 2 revealed that increasing density from one seedling hill -1 to three seedlings hill -1 significantly increased the CIPAR. Averaged over the two years data of RCE ranged from 1.41 to 1.44 g MJ -1 . Increasing application of irrigation significantly and linearly enhanced RCE for CATDM ranging from 1.34 to 1.49 g MJ -1 . Overall cumulative crop evapotranspiration (CCET) varied from 540 to 575 mm among different densities. Similarly CCET varied from 464 to 632 mm among different irrigation regimes. WUE varied from 23.1 to 23.7 kg ha -1 mm -1 among different densities. Averaged over the two seasons WUE for CATDM decreased with increasing application of irrigation and ranged from 25.2 to 21.9 kg ha-1 mm-1. The relationships between CATDM production and cumulative leaf area duration (CLAD) and CIPAR in Experiment 1 and CLAD, CIPAR and CCET in Experiment 2 were linear. Agronomic and economic nitrogen use efficiencies were higher at NF3 (N 150 kg ha -1 ).
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Claims 11
Claim · model-written summary
Cumulative intercepted PAR varied from 990 to 1016 MJ m-2 across nitrogen fertilizer levels.
- Taxon
- rice
Oryza sativat0 - Treatment
- nitrogen fertilizer levelse0
- Outcome
- cumulative intercepted photosynthetically active radiatione0
- Direction
- variede0
- Value
- 990 to 1016 MJ m -2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cumulative intercepted photosynthetically active radiation (CIPAR) varied from 990 to 1016 MJ m -2 in various nitrogen fertilizer levels”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Plant density did not significantly affect radiation conversion efficiency in both seasons, which ranged from 1.26 to 1.28 g MJ-1.
- Taxon
- riceOryza sativat0
- Treatment
- Plant densitye0
- Outcome
- RCEe0
- Direction
- did not affecte0
- Value
- 1.26 to 1.28 g MJ-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density did not affect significantly RCE in both the seasons and it ranged from 1.26 to 1.28 g MJ-1 among different densities”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Mean RCE for cumulative above-ground total dry matter ranged from 1.15 to 1.36 g MJ-1 among fertilizer levels.
- Taxon
- riceOryza sativat0
- Treatment
- different fertilizer levelse0
- Outcome
- mean RCE for cumulative above-ground total dry mattere0
- Direction
- rangede0
- Value
- 1.15 to 1.36 g MJ -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mean RCE for cumulative above-ground total dry matter (CATDM) ranged from 1.15 to 1.36 g MJ -1 among different fertilizer levels”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Increasing density from one to three seedlings per hill significantly increased cumulative intercepted PAR.
- Taxon
- riceOryza sativat0
- Treatment
- increasing density from one seedling hill -1 to three seedlings hill -1e0
- Outcome
- CIPARe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing density from one seedling hill -1 to three seedlings hill -1 significantly increased the CIPAR”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Increasing irrigation significantly and linearly enhanced RCE for CATDM, ranging from 1.34 to 1.49 g MJ-1.
- Taxon
- riceOryza sativat0
- Treatment
- Increasing application of irrigatione0
- Outcome
- RCE for CATDMe0
- Direction
- enhancede0
- Value
- 1.34 to 1.49 g MJ -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing application of irrigation significantly and linearly enhanced RCE for CATDM ranging from 1.34 to 1.49 g MJ -1”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Cumulative crop evapotranspiration varied from 540 to 575 mm among densities.
- Taxon
- riceOryza sativat0
- Treatment
- different densitiese0
- Outcome
- cumulative crop evapotranspiratione0
- Direction
- variede0
- Value
- 540 to 575 mme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overall cumulative crop evapotranspiration (CCET) varied from 540 to 575 mm among different densities”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Cumulative crop evapotranspiration varied from 464 to 632 mm among irrigation regimes.
- Taxon
- riceOryza sativat0
- Treatment
- different irrigation regimese0
- Outcome
- CCETe0
- Direction
- variede0
- Value
- 464 to 632 mme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similarly CCET varied from 464 to 632 mm among different irrigation regimes”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Water use efficiency varied from 23.1 to 23.7 kg ha-1 mm-1 among densities.
- Taxon
- riceOryza sativat0
- Treatment
- different densitiese0
- Outcome
- WUEe0
- Direction
- variede0
- Value
- 23.1 to 23.7 kg ha -1 mm -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE varied from 23.1 to 23.7 kg ha -1 mm -1 among different densities”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
WUE for CATDM decreased with increasing irrigation, ranging from 25.2 to 21.9 kg ha-1 mm-1.
- Taxon
- riceOryza sativat0
- Treatment
- increasing application of irrigatione0
- Outcome
- WUE for CATDMe0
- Direction
- decreasede0
- Value
- 25.2 to 21.9 kg ha-1 mm-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE for CATDM decreased with increasing application of irrigation and ranged from 25.2 to 21.9 kg ha-1 mm-1”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
CATDM production was linearly related to cumulative leaf area duration and CIPAR in Experiment 1.
- Taxon
- riceOryza sativat0
- Outcome
- CATDM productione0
- Comparator
- cumulative leaf area duration (CLAD) and CIPARe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationships between CATDM production and cumulative leaf area duration (CLAD) and CIPAR in Experiment 1”
t0“field grown transplanted rice (Oryza sativa L.)”
Claim · model-written summary
Agronomic and economic nitrogen use efficiencies were higher at NF3 (N 150 kg ha-1).
- Taxon
- riceOryza sativat0
- Treatment
- NF3 (N 150 kg ha -1 )e0
- Outcome
- Agronomic and economic nitrogen use efficienciese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Agronomic and economic nitrogen use efficiencies were higher at NF3 (N 150 kg ha -1 )”
t0“field grown transplanted rice (Oryza sativa L.)”
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See all 291 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.