Abstract
An experiment was conducted at the Experimental Farm of Sakha Agricultural Research Station 31° 07\ N and 30° 57\, Kafr El-Sheikh, Egypt, during 2015 and 2016 seasons to study the effect of skipping one irrigation at different growth stages and foliar application of zinc on quantitative and qualitative characteristics of sunflower cultivar Sakha 53.A split plot design with four replications was used. The main plots were devoted to water treatments i.e. I1= without skipping (control four irrigation during season), I2= skipping one irrigation during vegetative stage, I3=skipping one irrigation during flowering stage, I4= skipping one irrigation during grain filling stage. Sub plot treatments were devoted to foliar application with zinc sulfate , i.e. Zno= water application, Zn1= 0.5% and Zn2= 1% concentration. The results showed that flowering stage was the most sensitive to water deficit stress and skipping irrigation at this stage caused marked decrease in chlorophyll content in leaves, relative water content (RWC %), seed oil %, seed yield and its components, while increased proline content and seed protein % in the two growing seasons. Zinc spraying had significant effect on all attributes in this research. In general, application of Zn could be used as a good tool to increase yield of sunflower under drought stress.Also, the highest mean values for seasonal amount of water applied and water productivity were recorded under traditional irrigation. From this study we can be concluded that it is possible to gain high seed yield with less quantities of applied water when the irrigation skipping happens at vegetative stage with application of 1% zinc sulfate .
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Claims 11
Claim · model-written summary
Skipping irrigation at flowering decreased sunflower leaf chlorophyll content.
- Organ / stage
- flowering stagee0
- Treatment
- skipping irrigation at this stagee0
- Outcome
- chlorophyll content in leavese0
- Direction
- decreasee0
Not reportedTaxonComparator
Verbatim
e0“flowering stage was the most sensitive to water deficit stress and skipping irrigation at this stage caused marked decrease in chlorophyll content in leaves”
Claim · model-written summary
Skipping irrigation at flowering decreased relative water content in sunflower.
- Treatment
- skipping irrigation at this stagee0
- Outcome
- relative water content (RWC %)e0
- Direction
- decreasee0
Not reportedTaxonComparator
Verbatim
e0“skipping irrigation at this stage caused marked decrease in chlorophyll content in leaves, relative water content (RWC %)”
Claim · model-written summary
Skipping irrigation at flowering decreased sunflower seed oil percentage.
Not reportedTaxonComparator
Verbatim
e0“skipping irrigation at this stage caused marked decrease in chlorophyll content in leaves, relative water content (RWC %), seed oil %”
Claim · model-written summary
Skipping irrigation at flowering decreased sunflower seed yield and its components.
- Treatment
- skipping irrigation at this stagee0
- Outcome
- seed yield and its componentse0
- Direction
- decreasee0
Not reportedTaxonComparator
Verbatim
e0“skipping irrigation at this stage caused marked decrease in chlorophyll content in leaves, relative water content (RWC %), seed oil %, seed yield and its components”
Claim · model-written summary
Skipping irrigation at flowering increased sunflower proline content.
Not reportedTaxonTreatmentComparator
Verbatim
e0“while increased proline content and seed protein % in the two growing seasons”
Claim · model-written summary
Skipping irrigation at flowering increased sunflower seed protein percentage.
Not reportedTaxonTreatmentComparator
Verbatim
e0“while increased proline content and seed protein % in the two growing seasons”
Claim · model-written summary
Zinc spraying significantly affected the studied sunflower attributes.
Not reportedTaxonComparatorDirection
Verbatim
e0“Zinc spraying had significant effect on all attributes in this research”
Claim · model-written summary
Traditional irrigation gave the highest seasonal amount of water applied.
Not reportedTaxonComparator
Verbatim
e0“the highest mean values for seasonal amount of water applied and water productivity were recorded under traditional irrigation”
Claim · model-written summary
Traditional irrigation gave the highest water productivity.
Not reportedTaxonComparator
Verbatim
e0“the highest mean values for seasonal amount of water applied and water productivity were recorded under traditional irrigation”
Claim · model-written summary
The authors recommend zinc application to increase sunflower yield under drought stress.
- Taxon
- sunflower
Helianthus annuuse0 - Treatment
- application of Zne0
- Outcome
- increase yielde0
- Qualifier
- under drought stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of Zn could be used as a good tool to increase yield of sunflower under drought stress”
Claim · model-written summary
The authors conclude that skipping vegetative stage irrigation with 1% zinc sulfate can maintain high sunflower seed yield with less applied water.
- Treatment
- irrigation skipping happens at vegetative stage with application of 1% zinc sulfatee0
- Outcome
- high seed yield with less quantities of applied watere0
Not reportedTaxon
Verbatim
e0“it is possible to gain high seed yield with less quantities of applied water when the irrigation skipping happens at vegetative stage with application of 1% zinc sulfate”