scholarly journals Determination of Growth Stage-Specific Crop Coefficients (Kc) of Sunflowers (Helianthus annuus L.) under Salt Stress

Water ◽  
2017 ◽  
Vol 9 (3) ◽  
pp. 215 ◽  
Author(s):  
Minghai Hong ◽  
Wenzhi Zeng ◽  
Tao Ma ◽  
Guoqing Lei ◽  
Yuanyuan Zha ◽  
...  
Keyword(s):  
Salt Stress ◽  
Helianthus Annuus ◽  
Growth Stage ◽  
Helianthus Annuus L ◽  
Crop Coefficients

Polyamines in Helianthus annuus L. during Germination under Salt Stress

1997 ◽  
Vol 16 (4) ◽  
pp. 205-211 ◽  
Author(s):  
M. P. Benavides ◽  
G. Aizencang ◽  
M. L. Tomaro
Keyword(s):  
Salt Stress ◽  
Helianthus Annuus ◽  
Helianthus Annuus L

Dwarf sunflower response to row spacing, stand reduction, and defoliation at different growth stages

2003 ◽  
Vol 83 (2) ◽  
pp. 319-326 ◽  
Author(s):  
B. L. Johnson
Keyword(s):  
Helianthus Annuus ◽  
Oil Content ◽  
Growth Stage ◽  
Total Yield ◽  
Reciprocal Relationship ◽  
Yield Response ◽  
Yield Reduction ◽  
Row Spacing ◽  
Growth Stages ◽  
Helianthus Annuus L

Growth compensation of dwarf sunflower (Helianthus annuus L.) hybrids to low initial stands, later stand losses, or plant defoliation has not been reported regarding replanting decisions and crop insurance yield loss assessment. Three experiments were conducted to study the affect of stand reduction, defoliation, and row spacing on dwarf sunflower yield and quality when grown in eastern North Dakota. Experiment 1 evaluated stand reduction (0, 25, 50 and 75%) applied at growth stages (V4, R1 and R6) in 15, 45 and 76 cm spaced rows. Row spacing interactions with stand reduction and growth stage were not significant for yield indicating growth stage and stand reduction effects on yield response were independent of row spacing. In exp. 2, significant growth stage (V4, V8, R1, R2, R3, R5 and R6) by stand reduction (0, 12, 25, 37, 50, 62 and 75%) interaction showed stand reduction at vegetative growth stages not influencing yield, but as maturity progressed yield reductions became greater with increased stand reduction. Achene weight increased with increasing stand reduction at vegetative and early reproductive stages. A reciprocal relationship was noted between achene weight and achene oil content where oil content decreased as achene weight increased. Interaction of growth stage (R1 and R6) and defoliation (0, 25, 50, 75 and 100%) in exp. 3 indicated greater reduction in yield, test weight, 1000-achene weight, and achene oil conte nt as defoliatin increased at growth stage R6. Yield compensating ability of dwarf sunflower is dependent on type and level of damage and growth stage of occurrence, with total yield reduction considering all effects. Key words: Sunflower, Helianthus annuus L., row spacing, stand reduction, defoliation

Quantitative and Qualitative Determination of Allelochemicals In Sunflower (Helianthus annuus L.)

2000 ◽  
Vol 3 (12) ◽  
pp. 2075-2076 ◽  
Author(s):  
Nasira Mehboob . ◽  
Bushra Saleem . ◽  
Anwarul Haq . ◽  
M. Jamil Qureshi .
Keyword(s):  
Helianthus Annuus ◽  
Helianthus Annuus L ◽  
Qualitative Determination

scholarly journals Seed Germination and Physiological Response of Sunflower (Helianthus annuus L.) Cultivars under Saline Conditions

2018 ◽  
Vol 75 (1) ◽  
pp. 4
Author(s):  
Carmen BEINSAN ◽  
Renata SUMALAN ◽  
Giancarla VELICEVICI ◽  
Adriana CIULCA ◽  
Radu SUMALAN
Keyword(s):  
Seed Germination ◽  
Helianthus Annuus ◽  
Dry Matter ◽  
Saline Stress ◽  
Free Proline ◽  
Radicle Growth ◽  
Helianthus Annuus L ◽  
Control Seed ◽  
Germination Process

The purpose of the experiment was to highlight the germination of sunflower seeds affected by the presence of saline stress and the identification of tolerant genotypes. The biological material was represented by sunflower cvs. (Helianthus annuus L.): Coril, Select, Santiago and Fundulea-206. To simulate the saline conditions, germination solutions of sodium chloride (NaCl) were used with concentrations corresponding to the osmotic pressures -6 and -10 atm and the control seed hydration was performed with distilled water. Determination of seed germination, growth of seedling, percentage of plumules dry matter, chlorophyll content and free proline were performed. The experimental data obtained suppose the existence in the assimilation apparatus of sunflowers seedling subjected to stress a competitive chlorophyll/free proline biosynthesis processes. The experimental results regarding the effect of salinity on seed germination and seedling growth revealed important differences between genotypes. The radicle growth in the germination process were strongly affected by saline excess, with significant differences between cultivars. Saline stress results in significant reductions in the amount of chlorophyll, and high levels of free proline. It can be observed that with the increase of the stress level the percentage of the dry matter increases, indicating an accentuated water deficit.

Determination of growth-stage-specific crop coefficients (KC) of maize and sorghum

2009 ◽  
Vol 96 (12) ◽  
pp. 1698-1704 ◽  
Author(s):  
Giovanni Piccinni ◽  
Jonghan Ko ◽  
Thomas Marek ◽  
Terry Howell
Keyword(s):  
Growth Stage ◽  
Crop Coefficients
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