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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 Province, 2002
Initiated in 2002, this field project will evaluate the effect of phosphorus (P) and potassium (K) on the production of biomass and seed of established grasses (i.e. seven-year-old Siberian wild ryegrass and two-year-old wheatgrass) in the alpine grassland of Qinghai. These grasses supply feed to animals during the winter and stabilize the income of herdsmen.
Application of P improved wild ryegrass growth. At 75 kg P2O5/ha or more, the test grasses grew 5 cm taller than with no P added and longer grain ears were also observed. The dry matter of wild ryegrass was not influenced by P application, which was probably a result of the effect of P of increasing carbohydrate translocation towards seed production. Seed yield of wild ryegrass increased from 640 to 858 kg/ha when 150 kg P2O5/ha was applied. Root growth was also significantly improved with P application as the number of roots at the 15 cm depth increased from 28 to 35 per 25 cm2. The impact of K on wild ryegrass growth was not as prominent. Potassium application decreased plant height by 3 cm and increased grain ear length by 1 cm. Application of 38 kg K2O/ha resulted in the highest dry matter yield of 2,690 kg/ha. Potassium fertilizer increased the number of roots contained within 25 cm2 from 39.9 to 44.5 at the 5 cm depth, and from 34.6 to 37.6 at the 15 cm depth. The effect of K on wheatgrass was similar to wild ryegrass. Potassium increased the numbers of roots by 24% at the 15 cm depth and by 11% at the 20 cm depth. Qinghai-nms01 G
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