棉 花 学 报      Cotton Science 2008，20(6)：436-441

Effects of K Application on Cotton Nutritional Physiology and Yield on Calcaric Fluvisals Soil
LIU Dong-mei¹, CHU Gui-xin^1*, LI Jun-hua¹, LIU Yu¹, WANG Guo-dong¹, QUAN Xiao-yan¹,YANG Chang-jiang²
(1.Oasis Ecological Agriculture Key Lab., Xinjiang Production and Construction Group/Depart ment of Resource and Environmental Science, Agronomy College , Shihezi University, Shihezi, Xinjiang 832000, China ; 2. National Species Breeding Base of Xiayedi, Shihezi, Xinjiang 832000, China)

Abstract：Using transmission electron micrographs technique and conventional analysis approach, field and pot experiments were carried out to evaluate effects of K fertilizer on cotton nutritional physiology and yield in Calcaric Fluvisals soil in Xinjiang. The results showed that application of K fertilizer significantly increased cotton leaf stomatal conductance, and improved leaf chloroplast ultra- structure of in mid and late cotton plant growth stage. The stroma and grana lamellae chloroplasts are regular and compact under of K application treatment, whereas, chloroplasts was loose and disorganized at early cotton growth stage under the control treatment. K application obviously enhanced cotton tissue potassium content i.e. K content, in leaf and boll shell enhanced 13.3% and 6.3%, respectively. The boll number were 7.4 and 6.6 per plant, respectively, with both treatments of N₃₀₀P₁₅₀K₁₅₀ and control. Fruiting branch number of the treatment of K application was 11.8% higher than control. Cotton lint yield were 2284kg·hm^-2 and 2090kg·hm^-2, respectively, under treatments of N₃₀₀P₁₅₀K₁₅₀and control, through K fertilizer application can significant enhance lint yield. However, there has no obvious effect of K fertilization on fiber qualities.
Key words：calcaric fluvisals; potassium fertilizer; cotton; yield; quality; chloroplast
             ultra-structure     [Full Text, 3214KB]