|Author:||Abid, Niaz ; Ibrahim, M. ; Nadeem, M. Y. ; Sameen, A. ; Ahmed, W.|
|Book Group Author:||NA|
A lysimeter study was conducted during 1997-2000 at a greenhouse in the Soil Chemistry Section, Ayub Agricultural Research Institute, Faisalabad, Pakistan, to assess the effect of varying irrigation frequencies on soil moisture contents, leaching of solutes, yield, water use efficiency (WUE) and N uptake by maize (Zea mays) in fully-controlled and monitored conditions. Three irrigation levels: 3 (I1), 4.5 (I2) and 6 inches (I3) were applied in permanently constructed cemented lysimeters having dimensions of 4×4×4 feet. The recommended rate of N, P2O5 and K2O at 75-60-60 kg ha-1 was applied in the form of urea, single superphosphate and potassium sulfate, respectively. Soil samples were collected before each irrigation to determine the actual moisture content and solute (NO3- and NO2-) movement at various profile depths (0-15, 15-30, 30-60, 60-90, and 90-120 cm). Results revealed that after each irrigation no leachate was obtained at the bottom of each lysimeter, which clearly indicates that there is no pollution/leaching threat from agricultural chemicals like NO3. Soil analysis data showed that moisture content and NO3-N concentration in profiles increased with increasing depths but this increase was not enough to leach down the water through the soil profile. Maize was harvested 61 days after transplanting. Fodder yield and N uptake of maize was significantly affected by irrigation levels during 1997-98 and 1998-99. WUE of the crop was statistically non-significant during 1997-98, but during 1998-99 significantly higher WUE was recorded at irrigation frequencies of I1 and I2 than I3.
|Pages:||9 - 15|
|Journal:||Pakistan Journal of Agricultural Sciences|
application rates, calcareous soils, crop yield,groundwater, groundwater pollution, irrigation, irrigation scheduling,leaching, lysimeters, maize, nitrate, nitrate nitrogen, nitrogenfertilizers, nutrient uptake, phosphorus fertilizers, plant nutrition,plant water relations, polluted water, potassium fertilizers, potassiumsulfate, soil types, soil water content, solutes, superphosphate,transport processes, urea, water quality, water use efficiency,Pakistan, Zea mays, South Asia, Asia, Developing Countries, Commonwealthof Nations, Zea, Poaceae, Cyperales, monocotyledons, angiosperms,Spermatophyta, plants, Field Crops (FF005) (New March 2000), PlantNutrition (FF061), Plant Water Relations (FF062), Plant Production(FF100), Soil Chemistry and Mineralogy (JJ200), Soil Physics (JJ300),Fertilizers and other Amendments (JJ700), Soil Water Management(Irrigation and Drainage) (JJ800) (Revised June 2002) [formerly SoilWater Management], Water Resources (PP200), Pollution and Degrada