Abstract
The research was conducted on clay loam soil of NWFP Agricultural University Farm during Rabi, 1997-98 to study the effect of different irrigation schedules on water u se and yield of wheat. Experiments were conducted with one wheat variety, four irrigation intervals i.e. three weeks (W 3), four weeks (W 4), five weeks (W 5) and six weeks (W 6) and two pan levels i.e. equal to pan evaporation (P 1) and half of the pan evaporation (P 2) using randomized complete block design. Soil mois ture content was determined by gravimetric method. Actual evapotranspiration (ETa) was calculated by water balance method. The crop coefficients were determined from the rati o of actual evapotranspiration to potential evapotr anspiration. The average seasonal evapotranspiration of wheat were 5 18, 439, 496 and 478 mm and crop coefficients were 1.02, 0.87, 0.96 and 0.94, for W 3, W4, W 5 and W 6, respectively. Results of yield and its component s indicated that there was significant effect of irrigation intervals on grain yield, numb er of grain per spike, grain weight per spike, numb er of tillers per plant and visual lodging percentage. There was no difference in yield and yield components when the crop was irr igated according to the full evaporation (P 1) and half pan evaporation (P 2). Maximum yield was obtained when plots were irrigated after five weeks interval. Same was the case with number of grains per spike and grain weight per spike. But in c ase of number of tillers and lodging percentage, the result showed t hat more moisture favours greater number of tillers and lodging percentage. The highest water use efficiency (8.01 kg ha -1 mm -1 ) was obtained when crop was irrigated after five w eeks interval. It is concluded that for maximum yield of wheat the crop may be irrigated after five weeks i nterval. Excessive and earlier than five weeks irrigation interval can be harmful for the optimum yield of wheat if seasonal rainfall is � 330 mm.
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Claims 10
Claim · model-written summary
Seasonal evapotranspiration was 5 18, 439, 496 and 478 mm for W3, W4, W5 and W6.
- Taxon
- wheat
Triticum aestivume0 - Outcome
- average seasonal evapotranspiratione0
- Value
- 5 18, 439, 496 and 478 mme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average seasonal evapotranspiration of wheat were 5 18, 439, 496 and 478 mm and crop coefficients were 1.02, 0.87, 0.96 and 0.94, for W 3, W4, W 5 and W 6, respectively.”
Claim · model-written summary
Crop coefficients were 1.02, 0.87, 0.96 and 0.94 for W3, W4, W5 and W6.
- Taxon
- wheatTriticum aestivume0
- Outcome
- crop coefficientse0
- Value
- 1.02, 0.87, 0.96 and 0.94e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average seasonal evapotranspiration of wheat were 5 18, 439, 496 and 478 mm and crop coefficients were 1.02, 0.87, 0.96 and 0.94, for W 3, W4, W 5 and W 6, respectively.”
Claim · model-written summary
Irrigation interval significantly affected grain yield and several yield components.
- Treatment
- irrigation intervalse0
- Outcome
- grain yield, numb er of grain per spike, grain weight per spikee0
Not reportedTaxonDirection
Verbatim
e0“there was significant effect of irrigation intervals on grain yield, numb er of grain per spike, grain weight per spike, numb er of tillers per plant and visual lodging percentage”
Claim · model-written summary
Full versus half pan evaporation irrigation produced no difference in yield and yield components.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- full evaporation (P 1)e0
- Outcome
- yield and yield componentse0
- Direction
- no differencee0
- Comparator
- half pan evaporation (P 2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in yield and yield components when the crop was irr igated according to the full evaporation (P 1) and half pan evaporation (P 2).”
t0“WHEAT”
Claim · model-written summary
Five-week irrigation intervals gave maximum wheat yield.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- irrigated after five weeks intervale0
- Outcome
- Maximum yielde0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum yield was obtained when plots were irrigated after five weeks interval.”
t0“WHEAT”
Claim · model-written summary
Five-week irrigation intervals gave maximum grain number and grain weight per spike.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- irrigated after five weeks intervale1
- Outcome
- number of grains per spike and grain weight per spikee0
- Direction
- Maximume1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Same was the case with number of grains per spike and grain weight per spike.”
e1“Maximum yield was obtained when plots were irrigated after five weeks interval.”
t0“WHEAT”
Claim · model-written summary
More moisture favored greater tiller number and lodging percentage.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- more moisturee0
- Outcome
- number of tillers and lodging percentagee0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more moisture favours greater number of tillers and lodging percentage”
t0“WHEAT”
Claim · model-written summary
Five-week irrigation gave the highest water use efficiency of 8.01 kg ha -1 mm -1.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- irrigated after five w eeks intervale0
- Outcome
- water use efficiencye0
- Direction
- higheste0
- Value
- 8.01 kg ha -1 mm -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest water use efficiency (8.01 kg ha -1 mm -1 ) was obtained when crop was irrigated after five w eeks interval.”
t0“WHEAT”
Claim · model-written summary
The authors recommend five-week irrigation intervals for maximum wheat yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- irrigated after five weeks i ntervale0
- Outcome
- maximum yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for maximum yield of wheat the crop may be irrigated after five weeks i nterval”
Claim · model-written summary
Excessive or earlier-than-five-week irrigation may harm optimum wheat yield when seasonal rainfall is � 330 mm.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Excessive and earlier than five weeks irrigation intervale0
- Outcome
- optimum yielde0
- Qualifier
- if seasonal rainfall is � 330 mme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excessive and earlier than five weeks irrigation interval can be harmful for the optimum yield of wheat if seasonal rainfall is � 330 mm.”
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See all 989 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.