施钾对青引1号燕麦草产量及根系的影响

在缺钾地区，开展了不同施钾对青引1号燕麦（Avena sativa cv. Qingyin No.1）干物质产量和根系的影响，找出最佳施钾量，为青海省燕麦种子生产提供依据。结果表明，在施N 54.75 kg/hm2和施P2O5 51.75 kg/hm2的基础上，施K2O 40 kg/hm2，青引1号燕麦开花期收获时可获得最高的干物质产量和蛋白产量，分别为29575.0和2099.8 kg/hm2，二者均符合Y=a+bK+cK2函数变化。施K2O 40 kg/hm2，青引1号燕麦株高、总分蘖数、根长和根数最大，分别为184.5 cm、3.22个/株、15.90 cm和26.17 条/株； 施K2O 20 kg/hm2时，植株茎粗和根量达最大，分别为0.585 cm和0.540 g/株。各产量性状、地下生物量以及饲草和蛋白产量间均存在显著或极显著正相关关系。

Effects of potassium fertilization on fodder yield and root system of Avena sativa cv. Qingyin No.1

Effects of potassium fertilization on dry matter yield and root system of Avena sativa cv. Qingyin No.1 were studied to optimize the potassium application for oats production in a potassium deficient area. The results show that the optimum fodder and protein yields of the cultivar are 29575.0 kg/ha and 2099.8 kg/ha respectively at the blossom stage under the N 54.75 kg/ha, P₂O₅ 51.75 kg/ha and K₂O 40 kg/ha fertilization. Relation between dry matter, protein yield and K application can be described as Y=a+bK+cK². Under the K₂O 40 kg/ha treatment, the plant height, tiller, root length and root number of the cultivar are the highest, are about 184.5 cm, 3.22 till/plant, 15.90 cm and 26.17 roots/plant, respectively. Under the 20 kg/ha K₂O fertilization, diameter of stem and root weight are the highest, 0.585 cm and 0.540 g/plant, respectively. There are significant correlations between above-ground, under-ground yields and fodder, protein yields.