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在冀西北高寒区旱砂地条件下,研究钾肥施用量对饲用玉米产量和营养品质、根系吸收能力的影响。结果表明,施钾肥显著提高了饲用玉米的生物产量,增产5.3%～27.7%;施钾肥降低了粗蛋白、粗脂肪、全磷含量,显著增加了粗纤维、粗灰分和全钾含量,增加幅度分别为6.9%、18.0%和85.9%,3个施钾肥处理生物累积量分别提高36.1%、50.4%和137.1%;施钾肥明显提高了伤流强度、各养分流量和钾离子浓度,其中,钾离子流量和浓度分别提高240.7%和42.9%,降低了茎基部伤流液中全氮和无机磷的浓度。均衡养分管理是提高饲用玉米产量及肥料效应的关键。
Under the conditions of dry sandy land in northwest Hebei alpine region, the effect of potassium fertilizer on yield, nutritional quality and root absorption capacity of forage maize was studied. The results showed that applying K fertilizer significantly increased the biological yield of forage maize and increased the yield by 5.3% -27.7%. The application of K fertilizer decreased the content of crude protein, crude fat and total phosphorus, and significantly increased the content of crude fiber, crude ash and total potassium The biomasses of three K application treatments increased by 36.1%, 50.4% and 137.1%, respectively. The application of K fertilizer significantly increased the injury intensity, the nutrient flux and the K + concentration. Among them, Potassium flux and concentration increased by 240.7% and 42.9%, respectively, reducing the concentration of total nitrogen and inorganic phosphorus in the stem base effluent. Balanced nutrient management is the key to improving feed productivity and fertilizer effects.