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Khalid R.,Soil Fertility Survey and Soil Testing Institute | Khan K.S.,Pmas Arid Agriculture University | Islam M.,National Fertilizer Development Center | Yousaf M.,Pmas Arid Agriculture University | Shabbir G.,Pmas Arid Agriculture University
Journal of the Chemical Society of Pakistan | Year: 2012

A two year field study was conducted at two different locations in northern rainfed Punjab, Pakistan to assess the effect of different rates of sulfur application from various sources on soil sulfur fractions and growth of Brassica napus. The treatments included three sulfur sources i. e., single super phosphate, ammonium sulfate and gypsum each applied at five different rates (0, 10, 20, 30 and 40 kg S ha -1). Sulfur application had a significant positive effect on the growth and yield parameters of Brassica napus. Among the sulfur sources ammonium sulfate resulted in maximum increase in plant growth and yield parameters, followed by single super phosphate. Sulfur content and uptake by crop plants was significantly higher with ammonium sulfate application as compared to other two sulfur sources. Sulfur application also exerted a significant positive effect on different S fractions in the soils. On an average, 18.0% of the applied sulfur got incorporated into CaCl 2- extractable sulfur fraction, while 15.6% and 35.5% entered into adsorbed and organic sulfur fractions in the soils, respectively. The value cost ratio increased significantly by sulfur application up to 30 kg ha -1. Among sulfur sources, ammonium sulfate performed best giving the highest net return. Source


Afzal S.,Soil and Water Testing Laboratory | Islam M.,National Fertilizer Development Center | Obaid-Ur-Rehman,Soil and Water Conservation Research Station
Communications in Soil Science and Plant Analysis | Year: 2014

Field experiments were conducted at two locations in order to formulate phosphorus and potassium fertilizer recommendations of groundnut (Arachis hypogea) based on Mitscherlich-Bray equation. The treatments comprised four levels of phosphorus (0, 30, 60, and 90 kg phosphorus pentoxide (P2O5) ha-1) and three levels of potassium (0, 30, and 60 kg potassium oxide (K2O) ha-1) in all possible combinations. Theoretical maximum yield of groundnut was calculated by plotting log y (pod yield) versus 1/x (amount of nutrients applied). Fertilizer recommendation for various soil fertility levels and yield target were developed, and their validities were tested by conducting two field verification trials on the same soil. The results showed that although general recommended fertilizer dose resulted in highest yield of groundnut at both the locations, but value cost ratio and rate of increase in income were lowest with this fertilizer treatment, and 90% of maximum yield treatment was superior in terms of economics of fertilizer and risk factor. Copyright © Taylor & Francis Group, LLC. Source


Islam M.,National Fertilizer Development Center
Plant, Soil and Environment | Year: 2012

Field experiments were conducted at two different locations (Barani Agricultural Research Institute Chakwal and farm field Talagang, district Chakwal) for two crop-growing seasons in northern rainfed Punjab, Pakistan to assess the yield and micronutrient uptake of chickpea (Cicer arietinum). The treatments were four combinations of two levels of sulfur (15 and 30 kg/ha) from two sources (gypsum and ammonium sulfate) and a no-sulfur control. Application of sulfur resulted in a significant increase in seed yield up to 17% over control. Ammonium sulfate was a more efficient source of sulfur as compared to gypsum at both the locations. Sulfur application resulted in a significant increase in micronutrient uptake by plant; however effect of sulfur application on soil pH at the end of experiment was not significant. Availability of soil zinc and copper increased with sulfur application at the end of two year experiment. Tissue copper and iron and soil available copper and iron correlated negatively with soil pH. Sulfur should be applied to chickpea grown under rainfed conditions in order to increase seed yield, to improve nutritional composition of product and to enhance efficiency of other fertilizers. Source


Islam M.,National Fertilizer Development Center | Ali S.,Pmas Arid Agriculture University | Mohsan S.,National Fertilizer Development Center | Khalid R.,Soil and Water Testing Laboratory for Research | And 3 more authors.
Communications in Soil Science and Plant Analysis | Year: 2012

Field experiments were conducted at two different locations (Barani Agriculture Research Institute Chakwal and farmer's field in Talagang) in northern rainfed Punjab, Pakistan, to assess relative efficiency of two sources of sulfur (S) in enhancing nitrogen (N) fixation and yield of chickpea (Cicer arietinum L.). The treatments were four combinations of two levels of S (15 and 30 kg ha -1) from two sources [gypsum and ammonium sulfate (AS)] and a no-S control. Application of S significantly increased seed yield up to 12% and 14% at Chakwal and Talagang, respectively. Response (kg seed yield kg -1 S) at economic optimum dose (EOD) was greater for AS than for gypsum. Sulfur application enhanced the S uptake at both locations significantly. Sulfur harvest index and S economic yield efficiency ratio were greater at Talagang than at Chakwal. Sulfur application resulted increases in N uptake by 19% and 20% and N fixation by up to 19% and 30% at Chakwal and Talagang, respectively. Ammonium sulfate was more effective in increasing N fixation and uptake as compared to gypsum at Chakwal, whereas the difference between the two sources was nonsignificant at Talagang. Thus, it can be concluded that S should be applied to chickpea crop to enhance yield and improve soil fertility status as result of greater amount of N fixed. © 2012 Copyright Taylor and Francis Group, LLC. Source


Islam M.,National Fertilizer Development Center | Mohsan S.,National Fertilizer Development Center | Ali S.,Pmas Arid Agriculture University
Journal of Plant Nutrition | Year: 2013

Field experiments were conducted at two different locations under rainfed conditions of Punjab, Pakistan to assess nodulation, nitrogen fixation and nutrient uptake by chickpea (Cicer arietinum L.) in response to application of three rates [0, 40, and 80 kg phosphorus pentoxide (P2O5 ha-1)] of phosphorus and three rates (0, 15 and 30 kg S ha-1) of sulfur in different combinations. Effect of phosphorus application was nonsignificant while that of sulfur was significant on percent nitrogen derived from atmosphere. Both phosphorus and sulfur application resulted in increase in nitrogen fixation up to 38% and 33% over control, respectively. Nutrient uptake [nitrogen (N), phosphorus (P), and sulfur (S)] increased significantly with the application of phosphorus and sulfur and correlated positively with nitrogen fixation. There is direct involvement of sulfur in the process of nitrogen fixation whereas effect of phosphorus on nitrogen fixation is indirect mainly through enhanced growth and dry matter production. © 2013 Copyright Taylor and Francis Group, LLC. Source

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