Sunflower response to nitrogen and phosphorus in wheat-fallow cropping systems

Soil N status is critical for optimal production of oilseed crops. Lack of N results in low yields, while excess N promotes reduced oil contents. However, the effect may vary depending on soils and environmental conditions. In the High Plains, lack of moisture is often the factor that limits yield in many years and responses to fertilizer are not usually observed in this situation. Current recommendations for N in the region are based primarily on data developed in other sunflower producing regions. No database is available concerning N fertilization of sunflower in the northern High Plains when used as an alternative crop in a wheat-fallow rotation.

Sunflower response to nitrogen and phosphorus in wheat-fallow cropping systems Academic Article