不同小麦品种施钾效应的差异Ⅱ．氮、磷营养元素的吸收与平衡

DIFFERENCES IN POTASSIUM EFFECT AMONG DIFFERENT WHEAT VARIETIES Ⅱ.ABSORPTION AND BALANCE OF N,P ELEMENTS

在供钾（Ｋ２Ｏ，ｇ／ｋｇ）０．０，０．３的盆栽条件下，研究了１２个小麦品种吸收Ｎ、Ｐ以及Ｎ／Ｋ、Ｐ／Ｋ比的差异。结果表明，在相同钾水平下，１２个小麦品种植株地上部Ｎ、Ｐ含量构成明显的数量等级而呈等级差异，其生物学产量与地上部Ｎ、Ｐ吸收量呈极显著相关。在低钾条件下，Ｎ／Ｋ比与植株生物学产量呈极显著相关，提高钾水平，小麦地上部Ｎ、Ｋ吸收量增值之比与施钾效益（ＥＦ）值（以每吸收１ｇ钾所增加的地上部干物质克数表示）达极显著相关，但小麦地上部Ｐ、Ｋ吸收量增值之比与ＥＦ值则不存在显著相关性。从这个结果可以看出，不同小麦品种耐低钾及高效利用钾的能力与植株对氮的吸收。

Soil culture experiment was conducted to study the differences in absorption and balance of N, P elements among 12 wheat varieties under 2 level potassium conditions. The results showed that, at the same potassium level, the N, P contents of 12 wheat varieties could be classified as several degrees, and their bio-yields were significantly related to N, P absorption amount, at low potassium level, the relationship between N/K ratio and bio-yield was significant,and the ratio of N, K absorption amount increased by potassium utilization was correlated to the K efficiency value, but not so with the ratio of P,K absorption amount. Therefore the nitrogen absorption and nitrogen, potssium balance were very important for difterent varieties to endure low potassium press and utilized potassium efficently.