Spraying with I lb./acre of 80% sodium 2,4-~ z weeks after sowing reduced incidence of the phanerogamic root parasite Striga hermonthica (Scrophulariaceae, ' witchweed ') attacking rain-grown pearl millet (Pennisetum typhoides) in sandy soil of the Central Sudan, but this control resulted in increased yields only on land very deficient in available nitrogen and not when ammonium sulphate fertilizer was added. Nitrogen deficiency may be more important than Striga attack in limiting yields of millet in these sandy soils, although in inherently fertile clay soils elsewhere in the Central Sudan Striga has been reported to cause heavy crop losses to sorghum (Sorghum vulgare) before signs of soil exhaustion appear.
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