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1. . . / . . // . . . .-. : 06.01.09. , 1989. 17 .

2. . . / . . // . 1993. 2. . 6-7.

3. . . / . . // . . . .-. : 06.01.09. , 2006. 16 .

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, . . , . . // . . . . 2009. . 41. 3. . 187-207.

9. . / . // Farmer. 2011. 4. . 40-42.

References

1. Kharchenko N.I. Comparative productivity of sunflower varieties and hybrids under intensive technology of cultivation in the Northern Steppe of Ukrainian SSR. N. I. Kharchenko, Synopsis of thesis of Candidate of Agricultural Sciences: 06.01.09. Kherson. 1989. 17.

2. Kharchenko N.I. Plant density and productivity of hybrids. Technical cultures. 1993. 2: 6-7.

3. Dudnyk . V. Formation of productivity of sunflower varieties and hybrids on different agrotechnical backgrounds using growth bio-stimulants in the Southern Steppe of Ukraine. .V.

Dudnyk, Synopsis of thesis of Candidate of Agricultural Sciences: 06.01.09. Kherson. 2006.

16 .

4. Kaban V.. Formation of productivity of sunflower hybrids depending on agro-technical practices in the Eastern Barrens Steppe. V. . Kaban, Synopsis of thesis of Candidate of Agricultural Sciences: 06.01.09. Dnipropetrovsk. 2008. 20.

5. Recommendations for sunflower cultivation. Cherenkov .V., Shevchenko .S., Tkalich .D., Gyrka .D. et al. Dnipropetrovsk. 2011. 14.

6. Anishyn L. . Bounties of the sunflower field. Regulation elements in plant production. Collection of scientific papers. yiv: Kompas, 1998. 69-74.

7. Grytsaenko Z.. Biologically active substances in plant production. Z.. Grytsaenko, S.P.

Ponomarenko, V.P. Karpenko, . P. Leontyk. yiv: NICHLAVA. 2008. 352.

8. Morgun V.V. Growth-stimulating rhizobacteria and their practical application. Physiol. Biochem. Cult. Plant. 2009. . 41. 3: 187-207.

9. Semenyaka . Gain without fertilizers. Farmer. 2011. 4: 40-42.

   

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DROUGHT RESISTANCE AND WATER CONSUMPTION OF SUNFLOWER HYBRIDS

DIFFERENT BY RIPENING RATES DEPENDING ON BIOPREPARATIONS

   

sunflower hybrids, biopreparations, drought resistance, water consumption, yield capacity The data on effects of seed treatment of the sunflower hybrids Kyy, Yason, Zorepad with biopreparations on drought resistance, water consumption and yield capacity are summarized. A possibility of increasing the culture productivity via seed inoculation with the preparations Diazofit, KL-9, Phosphoenterin + Diazofit was demonstrated.

Study Purpose and Objectives. To explore possibilities of increasing sunflower drought resistance yield capacity we carried out a field experiment based on the use of beneficial soil microbial preparations of nitrogen-fixing phosphorus-mobilizing action via pre-sowing treatment as well as additional spraying of vegetating plants with the growth regulator Vympel.




140 .


Results and Discussion. The bacterial preparations had a positive impact on sunflower growth and leaf area. The early-ripening hybrid Kyy was found to be the most susceptible to the microbial preparations; its leaf area increased by 29.7-31.6% in the inoculated plants. The hybrid Yason occupied the middle position, and the middle-ripening hybrid Zorepad was the least sensitive.

Of the two associative diazotrophs, Diazofit and KL-9, plants responded better to Diazofit in terms of leaf area. The maximum plant height and leaf area on all phases of plant growth were achieved through the introduction of combination of the preparations Phosphoenterin + Diazofit.

The hybrids Zorepad and Yason had a slightly better resistance to drought as compared with Kyy.

The highest drought resistance of plants was achieved by seed treatment with combination of the bacterial preparations Phosphoenterin + Diazofit..

The test preparations provided improved performance of sunflower under drought stress due to a better water-holding capacity of plant tissues.

The seed treatment with the bacterial preparations provided a significant increase in yield capacity in all the hybrids. The highest effect of the bacterial preparations were observed upon their complex application: 0.22-0.23 t / ha (in the hybrid Kyy), 0.24-0.34 t / ha (in the hybrid Yason), and 0.38-0.49 t / ha (in the hybrid Zorepad).

Conclusions. During the growing season plants are constantly under stress (unfavorable conditions, weeds, diseases, pests) and experience chemical load. To avoid this, one need to find appropriate biological agents that can relieve suppressing effects of these factors.

Proper use of bacterial preparations based on rhizobacteria in combination with plant growth regulators a component of biological plant industry in sunflower cultivation technology will allow significant decreasing in chemical load on the ecosystem by reducing fertilizer amounts, enhancing yields and improving the quality of organic products.

Analysis of the results shows that in the current period of economic crisis application of new bacterial preparations and growth regulators can be considered one of the cheapest, environmentally friendly means of improving sunflower yields and seed oil content.



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