Effects of fertilizing rate on yield and its components of Qingyin No.1 oat

In order to find out the limited nutrient factors for oat grass yield, straw yield, seed yield and find the fertilization formulas to achieve the maximum economic efficiency, Qingyin No.1 was used to study the effect of different fertilization formulas of N, P and K on oats yield and yield components in Qinghai Huangzhong in 2010. The results showed that N was the main nutrient limiting factor for increasing fresh forage yield of oat and inputting N can improve plant height and the oat fresh forage yield significantly. N337.5P105K60 treatment had the highest yield, with 66 194 kgha-1, increased by 44.9% compared with control. P was the main nutrient limiting factor for increasing seeds yield and inputting P can improve effective tiller number and spike lets. N225P157.5K60 treatment had the highest grain yield, with 6 678 kgha-1. Through analyzing economic benefits, it was found that N225P105K60 treatment had the largest comprehensive income. Forage grass field was 18 435.3 CNYha-1 and seed producing field was 22 877.5 CNYha-1. Compared with the control group, the income increased by 4 500.9 and 45 97.5 CNYha-1, respectively.