EFFECT OF WATER STRESS AND DEFOLIATION ON SOME OF GROWTH INDICES IN SUNFLOWER

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HAJI HASSANI ASL N.; ROSHDI M.; GAFFARI M.; ALIZADEH A.; MORADI AGDAM A.

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Journal: JOURNAL OF RESEARCH IN CROP SCIENCES Year:2008 | Volume:1 | Issue:1 Page(s): 13-28

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Title

EFFECT OF WATER STRESS AND DEFOLIATION ON SOME OF GROWTH INDICES IN SUNFLOWER

Author(s)

Keywords

DEFOLIATIONQ2

GROWTH INDICESQ2

SEED YIELDQ2

SUNFLOWER AND WATER STRESSQ2

Abstract

In order to study the water stress and location and time of DEFOLIATION on some of GROWTH INDICES of sunflower (ALSTAR hybrid) an experiment was done during the years 2006 - 2007 in the "Agricultural Research Station of Khoy". Irrigation at three levels (irrigation after 80, 120 and 160 mm evaporation from class A Pan) as main plot and DEFOLIATION time at two levels (DEFOLIATION in R2 and R6 stage) to sub plot and DEFOLIATION locality in three levels (control, middle down leaves DEFOLIATION and middle up leaves DEFOLIATION) to sub sub plot to be studied in Strip Split Plot at the basis of Randomized Complete Block design in four replications. Results showed that water deficit stress decreased SEED YIELD significantly. SEED YIELD was 5522 kilogram in irrigation after 80 mm evaporation treatment, but SEED YIELD with regard to first level in irrigation decreased 8 and 24 percent in irrigation after 120 and 160 mm evaporation levels. DEFOLIATION time had significant effects on SEED YIELD and DEFOLIATION in R6 stage in SEED YIELD was better group. Comparison SEED YIELD (5133 kilogram in hectare) in DEFOLIATION treatment in R6 stage, with 4756 kilogram yield in DEFOLIATION treatment in R2 stage showed that leaves were especially important in primary reproductive growth stage. DEFOLIATION in different parts of stem caused significant difference in SEED YIELD and with middle up leaves DEFOLIATION most characters decreased severely. Study of growth indexes showed that irrigation after 120 and 160 mm evaporation from class a pan decreased Leaf Area Index, Net Assimilation Rate, Relative Growth Rate and Crop Growth Rate with regard to irrigation after 80 mm evaporation levels. Maximum difference between irrigation levels was in the middle of seasonal growth stage. DEFOLIATION in R2 stage caused the reduction of Leaf Area Index, Crop Growth Rate and Relative Growth Rate with regard to DEFOLIATION in R6 stage. Through the DEFOLIATION process (especially middle up leaves) there was a decrease in surveyed indices growth rate (expect Net Assimilation Rate), with regard to the control treatment.

Cites

EFFECTS OF IRRIGATION REGIMES, NITROGEN RATE AND PLANT DENSITY ON DRY MATTER ACCUMULATION IN SUNFLOWER (VAR. IROFLOR)

References

EFFECT OF DEFOLIATION ON YIELD AND YIELD COMPONENTS IN SUNFLOWER

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APA: Copy

HAJI HASSANI ASL, N., ROSHDI, M., GAFFARI, M., ALIZADEH, A., & MORADI AGDAM, A.. (2008). EFFECT OF WATER STRESS AND DEFOLIATION ON SOME OF GROWTH INDICES IN SUNFLOWER. JOURNAL OF RESEARCH IN CROP SCIENCES, 1(1), 13-28. SID. https://sid.ir/paper/167919/en

Vancouver: Copy

HAJI HASSANI ASL N., ROSHDI M., GAFFARI M., ALIZADEH A., MORADI AGDAM A.. EFFECT OF WATER STRESS AND DEFOLIATION ON SOME OF GROWTH INDICES IN SUNFLOWER. JOURNAL OF RESEARCH IN CROP SCIENCES[Internet]. 2008;1(1):13-28. Available from: https://sid.ir/paper/167919/en

IEEE: Copy

N. HAJI HASSANI ASL, M. ROSHDI, M. GAFFARI, A. ALIZADEH, and A. MORADI AGDAM, “EFFECT OF WATER STRESS AND DEFOLIATION ON SOME OF GROWTH INDICES IN SUNFLOWER,” JOURNAL OF RESEARCH IN CROP SCIENCES, vol. 1, no. 1, pp. 13–28, 2008, [Online]. Available: https://sid.ir/paper/167919/en

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