Sunflower
yield potential. These recommendations decrease as soil test P and/or K increase.
Response to P is not expected if soil P exceeds 30 lb/acre nor to K if the K test is greater
than 300 lb/acre.
Sunflower is not highly sensitive to soil pH. The crop is grown commercially on soils
ranging in pH from 5.7 to over 8. The optimum depends upon other properties of the soil;
no pH is considered optimum for all soil conditions. The 6.0 to 7.2 range may be optimal
for many soils.
E. Variety Selection(mitmekesisuslik valik):
The development of a cytoplasmic male-sterile and restorer system for sunflower has
enabled seed companies to produce high-quality hybrid seed. Most of these outyield
open-pollinated varieties and are higher in percent oil. Performance of varieties tested
over several environments is the best basis for selecting sunflower hybrids. The choice
should consider yield, oil percentage, maturity, seed size (for non-oilseed markets), and
lodging and disease resistance
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