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Interpretive Summaries:
2005 - Forage Oat Response to P and K Fertilizer Application in Qinghai
2004 - Preliminary Study of the Impact of Fertilization on Seeded Grasses in Qinghai
2003 - Preliminary Study of the Impact of Fertilization on Seeded Grasses in Qinghai
2002 - Preliminary Study of the Impact of Fertilization on Seeded Grasses in Qinghai Province
Preliminary Study of the Impact of Fertilization on Seeded Grasses in Qinghai, 2003
Seeded grasslands are important for sustaining the developing animal husbandry industry in Qinghai Province. Elymus sibiricus L., with its strong tillering, high production, and soft leaf tissue, is a predominant grass species for this alpine region. However, its production has been decreasing recently and low soil fertility is one important reason. Field trials were conducted in 2003 to determine responses of Elymus grass to nitrogen (N), phosphorus (P), and potassium (K) fertilizers.
Four-year-old Elymus Field Site. A P study used nine rates ranging between 0 and 225 kg P2O5/ha and determined that 173 kg P2O5/ha applied along with 112 kg N/ha and 52 kg K2O/ha produced the highest seed yield of 2,947 kg/ha, which was 1,249 kg/ha higher than the zero P treatment. This improved treatment also returned the highest profit of US$2,060/ha, which was US$875/ha higher than zero P treatment. The corresponding K rate study at the same location used nine rates ranging between 0 and 225 kg K2O/ha. It found 37 kg K2O/ha applied along with 75 kg N/ha and 75 kg P2O5/ha produced a seed yield of 2,847 kg/ha, which was US$1,299 kg/ha higher than the NP treatment. This optimum returned a net profit of US$2,016/ha, which was US$937/ha higher than NP treatment.
Eight-year-old Elymus Field Site. A P rate study used seven different rates ranging between 0 and 187 kg P2O5/ha, and found 36 kg P2O5/ha applied along with 112 kg N/ha and 52 kg K2O/ha produced a seed yield of 1,349 kg/ha, which was 400 kg/ha higher than the NK treatment. This treatment returned a net profit of US$925/ha, which was US$284/ha higher than the NK treatment. The corresponding K rate study at the same location used seven rates from 0 to 187 kg K2O/ha and found 150 kg K2O/ha applied along with 75 kg N/ha and 75 kg P2O5/ha produced the highest seed yield of 1,399 kg/ha, or 500 kg/ha higher than the NP treatment. This treatment returned the highest profit of US$945/ha, which was US$338/ha higher than the NP treatment. Qinghai-NMS01 G
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