| 1 | Interactive Effects of Potassium and Phosphorus on Phenology and Grain Yield of Sunflower in Northwest Pakistan显示文摘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 cv.Hysun-33 at the New Developmental Research Farm of KPK Agricultural University,Peshawar,Pakistan,during summer 2006.The 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 replications.Sunflower yield and yield components responded positively to K and P fertilization but the magnitude of response varied with the levels of K and P.Days 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 applied.The 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. | AMANULLAH M.W.KHAN | 2010 | Pedosphere2010，20，5： | 6 |
| 2 | Interactive Effect of Potassium and Phosphorus on Grain Quality and Profitability of Sunflower in Northwest Pakistan显示文摘A field experiment was conducted using a split plot randomized complete block design with three replications to study the effects of potassium (K) and phosphorus (P) application on sunflower (Helianthus annuus L.) growth at the New Developmental Research Farm of Khyber Pakhtunkhwa Agricultural University in Peshawar,Pakistan.Six levels of K (0,25,50,75,100 and 125 kg K ha-1) were main plots while four levels of P (0,45,90 and 135 kg P ha-1) were subplots.Increase in both K and P levels enhanced grain oil concentration of sunflower.Increase in P level increased grain protein concentration,while increase in K level decreased grain protein concentration.Both oil and protein yields increased significantly with increase in K and P levels.The increase in oil and protein yields of sunflower was mainly attributed to the improvement in yield components (grains per head,grain weight and head size) and the significant increase in grain yield.The highest net returns of 297 and 368 US$ ha-1 based on grain and oil yields,respectively,were obtained from a combination of 100 kg K ha-1 + 45 kg P ha-1. | AM ANULLAH M.W.KHAN | 2011 | Pedosphere2011，21，4： | 2 |
您所在的机构暂未开通此部分的功能，请联系管理员