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Articles by M. Ehsan Akhtar
Total Records ( 5 ) for M. Ehsan Akhtar
  Maqbool Akhtar and M. Ehsan Akhtar
  Effect of applied K on agronomic traits and productivity of sugarcane was studied by applying potassium levels of 0, 50, 100, 150 and 200 kg K2O ha -1 with a basal dose of 220 kg N and 120 kg P2O5 ha -1. Early stalk population increased with increasing potash levels. Number of tillers per hectare, at early growth stages, were minimum and significantly low in plots where K was not applied. Application of K increased millable canes significantly. K did not affect total soluble solids (Brix %) during October and at the start of November. However, during December total soluble solids (Brix %) were significantly higher in K applied plots than the control. Stalk height was increased with K application. It was minimum in control plots (250.33 cm) and maximum (310 cm) at 150 kg K2O ha -1. Stalk diameter also followed a similar trend which was minimum (27.40 mm) in control and was maximum (31.75 mm) at 150 kg K2O ha -1. Cane yield increased with K application and it was maximum (155 t ha -1) with the application of 150 kg K2O ha-1. Sugar recovery was also higher in applied K treatments and it was maximum (11.6 %) with the application of 150 kg K2O ha -1. P, K, Mg, B and Zn contents of the leaf sheath were also increased significantly with the application of K. Economic analysis of the study showed that each incremental application of K increased net profit and it was maximum (Rs. 20,200 ha -1) with the application of 150 kg K2O ha -1.
  M. Ehsan Akhtar , Aneela Sardar , M. Ashraf , Maqbool Akhtar and M. Zameer Khan
  A pot experiment was conduced in a glasshouse at the National Agricultural Research Centre (NARC), Islamabad to study the effect of application potash on boll weight, boll size and seed cotton yield in selected cotton varieties, namely CIM-443, CIM-109 and CIM-446 during summer 1999. Potash as MOP was applied @ 0, 100 and 200 kg K2O ha-1 along with basal application of N and P @ 150 and 75 kg P2O5 ha-1. The results showed that boll weight and size increased significantly with increasing K2O levels of application and they were maximum at 200 kg K2O ha-1. However, no significant difference was observed in the boll size of different varieties. Seed cotton yield also increased significantly in all the varieties with increasing K2O. The magnitude of response was variable and maximum response was observed in case of CIM-446 followed by CIM-109 and CIM-443.
  Maqbool Akhtar , M. Ehsan Akhtar , Khurram Bashir and Shahid Rafiq Ch
  A field experiment was conducted to study the effect of various nitrogen levels (0, 75, 150 and 225 kg ha-1 ) on agronomic characters, productivity, maturity and nutrient contents of sugarcane at the National Agricultural Research Centre Islamabad during 1996-98. All the treatments were given a constant dose of 120 kg ha‾1 of P2O5 and 150 kg ha‾1 of K2O. Early stalk population increased as the N dose was increased. Maximum number of tillers per hectare were found at 225 kg N ha‾1 at all growth stages. Similarly at harvest, millable canes per hectare were the maximum (139.7 thousands) at 225 kg N ha‾1. Stalk height increased significantly as the N levels were increased and it was the maximum (264.67 cm) at N level of 225 kg ha‾1. Nitrogen also increased stalk girth significantly. Brix percentage was similar at early maturity stages at all N levels, however, at harvest it was significantly lower in N applied plots than the control. Cane yield increased significantly with increasing N levels with the maximum (149.4 t ha‾1) at 225 kg N ha‾1. Although sugar recovery was maximum (11.8 %) in the control plots but it was statistically similar to other treatments. Application of 225 kg N ha-1 produced the maximum sugar yield of 16.87 t ha‾1. Phosphorus, K, Zn, Mg and B contents in the plant tissue increased significantly with increasing N application levels.
  Sagheer Ahmad , Abdul Ghafoor , M. Abbas Aziz and M. Ehsan Akhtar
  A calcareous saline-sodic soil (pHs = 8.26, ECe = 9.07 dS m–1, SAR = 37.90, CaCO3 = 8.58 %, texture = sandy clay loam) packed in concrete lysimeters was tested for Phytoremediation. The treatments were: No-Sesbania (T1), Sesbania-harvested (T2) and Sesbania-incorporated (T3) before flowering. Rice-wheat crop rotation was followed after Sesbania. Each crop was irrigated with high RSC water (3.1 mmolc L–1) according to its water requirement and 20 % extra water was allowed to infiltrate each time. Three leachate were collected during Sesbania, five during rice and four during wheat crop. One leachate was collected at pre-planting irrigation (Rouni) of rice. It was observed that the treatment from where Sesbania was harvested (T2) caused more salts leaching as compared to other treatments. Net salt removal was observed only during rice crop while during rest of the crops there was salt deposition in soil. Net CO32‾ removal increased while that of HCO3‾ decreased throughout the study period showing an increase in pH of soil solution phase. Similarly Ca2+ + Mg2+ removal remained less while that of Na+ more but similar with all the treatments than that of added through irrigation water indicating ineffectiveness of Sesbania either in the form of harvest or incorporate into the soil. It is opined that salts/ionic removal is not sufficient enough to coup with the amelioration of calcareous saline sodic soils.
  Maqbool Akhtar , Khurram Bashir , M. Ehsan Akhtar , M. Zameer Khan and Shahid Rafiq Ch.
  A field experiment was conducted to study the effect of timing of the last dose of split nitrogen application on agronomic traits and nutrient contents of sugarcane. The study was carried out at the National Agricultural Research Centre Islamabad during 1996-97. Application timing of the last dose of nitrogen did not affect early stalk population, millable canes, stalk height, stalk girth and total soluble solids (TSS). Application of last dose of N at early stage (last week of March) produced significantly lower cane yield than other timings of N application. Maximum cane yield of 146 t ha–1 was produced when the last dose of N was applied during the first week of June. Cane yield produced with the application of last dose of N either the mid May or the first week of July produced statistically similar cane yield that was produced with the application of last dose of N during first week of June. Sugar recovery was significantly decreased with the late application (July 1st week) of the last dose of N. Maximum sugar yield (15.70 t ha –1 ) was produced when the last dose of N was applied during the middle of May. P, K, Zn and B contents were not affected with the timing of application of nitrogen. However, Mg contents of the tissue increased significantly as the application of the last dose of nitrogen was delayed.
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