苜蓿改良的盐碱土壤施肥对小麦的效应研究--II.对小麦生理特性的影响

Effet of fertilizer on wheat in saline soil improved by alfafa--II. Its effect on some physiological characters

摘要: 盐栽试验结果表明，苜蓿改良的盐碱土壤施N肥能使小麦旗叶叶水势升高，叶片水分保持较好，叶绿素总含量提高l3％～80％(以叶绿素b为主)，叶片光合速率和蒸腾强度增加，蒸腾效率提高，施N肥配合补P肥效果更好，这些变化构成了在该类地区施N肥补P肥增产的生理基础。

Abstract: The results from pot experiments show that N can increase water potentml of flag leaf by about 2．0 bars，chlorophyll content by l3%～8O%(mainly chlorophyll B)，photosyn-thesis rate by about 26%，transpiration rate by about 14%，transpiration efficiency by lO% in saline soil improved by alfafa in Heilonggang Region,Hebei．These effects are more obvious if N and P are applied．These changes of physiological characters are the physiological base for increasing yield by applying N and P in this region．