Abstract
Results of a trial carried out on sunflower in order to evaluate the most appropriate sowing date and irrigation regime for a more efficient water use are reported. Sunflower was sown in 1995-1996 at the usual date (end of April) and in advance (end of March). It was subjected to three irrigation regimes: full restoration of consumptive water use, supplementary irrigation at the bud stage and flowering and unirrigated control. During the growing cycle, the following parameters were measured: water use, the main climatic data that can affect growth and evapotranspiration, yield and its components. Despite the lower vapor pressure deficit of the air during the cropping cycle of the first sowing date caused a reduction in the average daily evapotranspiration, the colder temperature regime of this period, by making longer the growing cycle, caused almost the same total water use respect to the usual sowing dates. However, with early sowing, the crop could benefit from the spring rainfall at the initial stages of its cycle that reduced the seasonal irrigation volume, in the case of full irrigation and made available a greater amount of water in the case of unirrigated treatment or with supplementary irrigation. The greater water availability in the stressed treatments also produced higher grain yield in early sowing, so that an interesting interaction between the sowing date and the irrigation regime in terms of water use efficiency was observed. In fact, a significant higher irrigation yield water use efficiency and an interesting yield response was measured in the treatment with supplementary irrigation of the first sowing date. No effect of sowing date, both in terms of yield that of water use efficiency was measured in the treatment irrigated with the full restoration of evapotranspiration.
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Claims 7
Claim · model-written summary
Early sowing produced higher grain yield in the stressed (unirrigated or supplementary irrigation) treatments owing to greater water availability.
- Taxon
- Sunflower
Helianthus annuust0 - Treatment
- early sowinge1
- Outcome
- grain yielde1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e1“The greater water availability in the stressed treatments also produced higher grain yield in early sowing”
Claim · model-written summary
Supplementary irrigation at the first sowing date gave a significantly higher irrigation yield water use efficiency.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- supplementary irrigation of the first sowing datee1
- Outcome
- irrigation yield water use efficiencye1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e1“a significant higher irrigation yield water use efficiency and an interesting yield response was measured in the treatment with supplementary irrigation of the first sowing date”
Claim · model-written summary
Under full restoration of evapotranspiration, sowing date had no effect on yield or water use efficiency.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- sowing datee1
- Outcome
- yield that of water use efficiencye1
- Direction
- No effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e1“No effect of sowing date, both in terms of yield that of water use efficiency was measured in the treatment irrigated with the full restoration of evapotranspiration”
Claim · model-written summary
The colder temperature regime of the early sowing period lengthened the growing cycle and led to almost the same total water use as the usual sowing dates.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- total water usee1
- Direction
- almost the samee1
- Comparator
- the usual sowing datese1
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e1“the colder temperature regime of this period, by making longer the growing cycle, caused almost the same total water use respect to the usual sowing dates”
Claim · model-written summary
The lower vapor pressure deficit during the first sowing date cycle reduced the average daily evapotranspiration.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- first sowing datee1
- Outcome
- average daily evapotranspiratione1
- Direction
- reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e1“lower vapor pressure deficit of the air during the cropping cycle of the first sowing date caused a reduction in the average daily evapotranspiration”
Claim · model-written summary
With early sowing, spring rainfall at the initial stages reduced the seasonal irrigation volume under full irrigation.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- early sowinge1
- Outcome
- seasonal irrigation volumee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e1“with early sowing, the crop could benefit from the spring rainfall at the initial stages of its cycle that reduced the seasonal irrigation volume, in the case of full irrigation”
Claim · model-written summary
An interaction between sowing date and irrigation regime on water use efficiency was observed.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- irrigation regimee1
- Outcome
- water use efficiencye1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower”
e1“an interesting interaction between the sowing date and the irrigation regime in terms of water use efficiency was observed”
The same questions in other papers
irrigation · physiology: water · Helianthus annuus (common sunflower)Positive and negative results
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See all 49 papers →sowing time · yield · Helianthus annuus (common sunflower)Positive and negative results
38 papers in the same direction as this paper · 13 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
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See all 53 papers →sowing time · physiology: water · Helianthus annuus (common sunflower)Results agree
1 paper in the same direction as this paper
- positive
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.