The different potassium fertilizer level are applied to Avena sativa ev. Qingyin No. 1 oat to discuss effect of Potassiurl fertilizer on seed yield and yield characteristic of oat, study relation between seed yield and yield characteristic,and find optimum potassium fertilizer tevel and give a suggestion to oat grass production in Qinghai province. It turned out that, the yield characteristics of Avena sativa cv. Qingyin No. 1 were increased by potassium fertilizer. It＇s maximum florets per spikelet, seed number per inflorescence, seed weight per inflorescence, length of grain, width of grain and 1000 - grain weight is 2.7,86.7,2.56g, 1. 604cm, 0 318cm and 33.50g respectively when potassium fertilizer level is 10 - 20kg/hm2, 20 - 30kg/hm2, 50kg/hm2, 30 - 40kg/hm2, 30kg/hm2 and 60kg/hm2 respectively. The optimum seed yield and protein yields of the eultivar are 6425. 3 kg/hm2 and 864. 9 kg/hm2 respectively under the N 54.75 kg/hm2 , P2 05 51.75 kg/hm： and K20 40 kg/hm2 fertilization. Relation between seed yield, protein yield and K application can be described as ys = 5164.65 ＋ 49.94 K -0.52 K2 and yp = 618.29 ＋ 7.00 K -0. 050 K2 respectively. Relation between seed yield and yield characteristics can be described as ys = - 19268.1 - 519.2 Fs ＋780.6 Ns-219.1 Li-2035.1 Swi ＋665.5 Lg ＋ 19047.6 Wg while Avena sativa cv. Qingyin No. 1 oat＇s seed yield is mainly affected by number of spikelet, length of grain and width of grain.%对青引1号燕麦（Avena sativa cv.Qingyin No.1）采用不同施钾处理,探讨不同施钾对其种子产量和产量性状的影响,并对产量性状和产量间的关系进行研究,找出最佳的施钾量,为青海省燕麦种子生产提供了理论依据。结果表明：钾肥能显著提高青引1号燕麦各产量性状的增加。在施N54.75kg/hm2和施P2O551.75kg/hm2的基础上,当施K2O分别为10～20 kg/hm2、20～30kg/hm2、50kg/hm2、30～40kg/hm2、30kg/hm2和60kg/hm2时,青引1号燕麦小花数、单序籽粒数、单序籽粒重、粒长、粒宽、千粒重达到最大,分别为2.7个、86.7个、2.56 g、1.604 cm、0.318cm和33.50 g。青引1号燕麦在施K2O40kg/hm2时,种子产量及蛋白产量达到最高,分别为6425.3kg/hm2和864.9kg/hm2,其种子产量与施K量间可用ys=5164.65＋49.94 K-0.52 K2预计,蛋白产量与施K量间可用yp=618.29＋7.00 K-0.050 K2预计。青引1号燕麦种子产量与各产量性状间的数量关系可用ys=-19268.1-519.2 Fs＋780.6 Ns-219.1 Li-2035.1 Swi＋665.5Lg＋19047.6 Wg表示。小穗数、粒长、粒宽对种子产量的增加直接效应最大。
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