Interactive Effects of Potassium and Phosphorus on Phenology and Grain Yield of Sunflower in Northwest Pakistan

作     者：AMANULLAH M.W.KHAN AMANULLAH*1 and M.W.KHAN Department of Agronomy,Faculty of Crop Production Sciences,KPK Agricultural University,Peshawar(Pakistan)

作者机构：Department of AgronomyFaculty of Crop Production SciencesKPK Agricultural University 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2010年第20卷第5期

页      面：674-680页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：Special thanks are extended to Dr. P. SHAH  retired professor of agronomy  for the statistical analysis of the data 

主　　题：days to flowering days to maturity harvest index soil yield components 

摘      要：Potassium(K) and phosphorus(P) applications improve growth,increase yield and yield components of sunflower(Helianthus annuus L.) on K and P deficient soils in Northwest Pakistan.A field experiment was conducted using sunflower ***-33 at the New Developmental Research Farm of KPK Agricultural University,Peshawar,Pakistan,during summer *** experimental design was a randomized complete block in split plot arrangements,with six levels of K(0,25,50,75,100,and 125 kg K ha-1) as main plots and four levels of P(0,45,90,and 135 kg P ha-1) as sub-plots with three *** yield and yield components responded positively to K and P fertilization but the magnitude of response varied with the levels of K and *** to flowering and maturity,grains per head,1000-grain weight,shelling percentage,and grain yield increased tremendously in the K and P-fertilized plots as compared to the control with no K and P *** combined application of 100 kg K and 45 kg P ha-1 significantly increased yield components,grain yield,harvest index,and shelling percentage of sunflower,suggesting that 100 kg K ha-1 in combination with 45 kg P ha-1 could maximize productivity of sunflower planted after wheat on the K and P deficient soils in the study area.