大麦氮磷钾吸收动态初报

Preliminary studies on assimilation of nitrogen, phosphorns and potassium in winter barley (Hordeum distichum L.)

1984—1985年在杭州就不同施氮量下大麦(Hordeum distichum L、,品种浙皮1号和早熟3号)对氮、磷、钾养分的吸收动态作了研究。结果表明,大麦植株地上部氮、磷、钾的积累持续至灌浆期。氮和钾的吸收强度以拔节至抽穗阶段最大,磷吸收强度最大的时期为抽穗至灌浆阶段。增施氮肥不仅提高地上部的氮素积累量,同时也增加了植株地上部磷、钾的积累量。生育后期植株地上部的养分右不同程度的损失,其中钾的损失最为明显,达最大积累量的30—40％。在本试验条件下,每生产100公斤大麦籽粒需氮2.85±0.56公斤,磷0.86±0.23公斤和钾2.30±0.38公斤。

Field experiment dealing with nutrients uptake of winter barley (H. distic-hum L.; C. A. Zhepi--1 & Zaoshu--3) at various nitrogen fertilizer rates wasconducted in Hangzhou 1984-85. It was found that the three major nutrientswere accumlated continuously in the tops of plant until the grain filling sta-ge. Both N and K were most intensively absobed during the period betweeninternode enlongation and ear emergence, whereas P did so during the period between ear emergence and grain filling. Not only the quantiy of N but thosesof P and K accumulated in the aboveground parts increased at the highernitrogen levels. The losses of nutrients from the tope of plant were foundduring the later growth period. Among the three major nutrients the lossesof K were the most significant and accounted for 30--40% of the total quan-tity. The results of the present investigation also showed that 2.85±0.56 KgN, 0.86±0.23 Kg P and 2.30±0.38 Kg K were required to produce 100 Kggrain.