不同施钾量对冬小麦几个光合特性和产量的影响

 1992～1994年,在滇中山原红壤上所作的田间试验中,冬小麦在3种NP施用水平下施用不同用量的钾肥.研究的初步结果表明,在配施NP肥的基础上,随着施钾量的增加,小麦叶片的气孔阻力减少,提高叶片胞间CO₂浓度和叶绿素含量,增加净光合速率,籽粒产量也有不同程度的增加.

Effect of Various Rates of Potassium Fertilizer on somePhotosynthetic Characters and Yield of Winter Wheat

In field trails in 1992-1994, Effect of various rates of potassium fertilizer on some photosynthetic characters and yield of winter wheat were researched in soil that was deficient in available N, P and K. The initial results showed that on the basis of 3 levels of NP application, different rates of K fertilizer could increase chlorophyll content, decrease stomatal resistance (CS) and raise net photosynthetic rate of winter wheat (photo).In the drought year, all treatments of dressing chemical fertilizer increased grain yield of wheat to a certain extent. In the same NP level, 1 000-grain weight, potassium content of grain and grain yield of wheat increased with K fertilizer rate. Higher rate of K fertilizer as compared with no NP fertilizer, the grain yield increased with rate of K fertilizer and economic effect of K fertilizer were better than N₀P₀ treatment. The results also showed that NP fertilizer combinated with K fertilizer was of great importanee and illustrated that good supply of nutrients especially K could partly reduce the loss by drought.