CAJ | 학술논문

对8龄多叶老芒麦人工草地进行施磷、钾试验.结果显示,施磷肥对抽穗期、开化期和乳熟期老芒麦的地上生物量分别增重16.25%～50.32%、5.86%～35.74%和10.72%～44.37%,施钾肥增重16.96%～51.56%、9.63%～58.32%和12.70%～46.91%.在氮钾或氮磷施用量适中时,配施磷肥112.5 kg/hm~2或配施钾肥75 kg/hm~2时,老芒麦的地上生物基最大.配施磷和钾能显著增加老芒麦0-25 cm根重(P<0.05).配施磷或钾75 kg/hm~2时,老芒麦0-5和0-25 cm根重最大,分别为8.97 g/m~2、9.06 g/m~2和21.39 g/m~2、23.84 g/m~2.配施磷和配施钾时,老芒麦茎秆中粗蛋白(CP)和粗脂肪(CF)含量呈先增后降变化,施磷75 kg/hm~2或施钾112.5 kg/hm~2时,老芒麦茎杆中CP和CF的含量最大.配施等量磷、钾肥,施磷茎秆中CP和CF含量高于施钾,二者最大值差分别是0.53%和0.38%.三个生育期内,老芒麦地上部分与地下根系增重不总足与施肥量呈正相关,相同施肥量下钾肥的增重略高于磷肥.
대8령다협로망맥인공초지진행시린、갑시험.결과현시,시린비대추수기、개화기화유숙기로망맥적지상생물량분별증중16.25%～50.32%、5.86%～35.74%화10.72%～44.37%,시갑비증중16.96%～51.56%、9.63%～58.32%화12.70%～46.91%.재담갑혹담린시용량괄중시,배시린비112.5 kg/hm~2혹배시갑비75 kg/hm~2시,로망맥적지상생물기최대.배시린화갑능현저증가로망맥0-25 cm근중(P<0.05).배시린혹갑75 kg/hm~2시,로망맥0-5화0-25 cm근중최대,분별위8.97 g/m~2、9.06 g/m~2화21.39 g/m~2、23.84 g/m~2.배시린화배시갑시,로망맥경간중조단백(CP)화조지방(CF)함량정선증후강변화,시린75 kg/hm~2혹시갑112.5 kg/hm~2시,로망맥경간중CP화CF적함량최대.배시등량린、갑비,시린경간중CP화CF함량고우시갑,이자최대치차분별시0.53%화0.38%.삼개생육기내,로망맥지상부분여지하근계증중불총족여시비량정정상관,상동시비량하갑비적증중략고우린비.
Under the conditions of sufficient N, P and K fertilization, growth index including aboveground biomass, dry root weight at different growing period and forage nutritional indexes, such as DM, CP, CF and CF at milky maturity stage of 8a Elymus sibiricus were measured in an artificial grassland on May in 2003 at well-bred site in Qinghai Province. The results showed that P and K fertilization increased the aboveground biomass of E. Sibiricus by 16.25 % -50.32%, 5.86%-35.74%, 10.72%-44.37%, and 16.96%-51.56%, 9.63%-58.32%, 12.70%-46.91% at heading date,flowering period and milky maturity stage, respectively. At the rational level of NK or NP, the maximum aboveground biomass was observed when additional P 112.5 kg/ha or K 75 kg/ha was applied. Applying both P and K could increased the roots weight in 0-25 cm significant ( P < 0.05). The root weight in depth of 0-5 cm and 0-25 cm of E. Sibiricus was maximum when additionally applying P or K 75 kg/ha. The con.tent of CP and CF increased first then decreased after application of P and K. Applying P 75 kg/ha or K 112.5 kg/ha resulted in the highest the content of CP and CF in the stem. The weight increased of biomass of aboveground and roots did not consistently positive correlation to the quantity of fertilizer application. The weight increased with potassium fertilizer was higher than phosphorus fertilizer at the same fertilizer level.