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The effects of manure application on soil aggregation
Springer Science and Business Media LLC - Tập 80 - Trang 173-180 - 2007
Surface application of manure may increase the risk of phosphorus loss in runoff. Manure application, however, often results in increased soil aggregate stability with reduced runoff and erosion and, therefore, reduced P transport potential. Three field studies were conducted with silt loam or silty clay loam soil in Nebraska to determine how water-stable soil aggregation in the 0- to 25-mm soil d......
Nitrogen cycling assessment in a hedgerow intercropping system using 15N enrichment
Springer Science and Business Media LLC - Tập 62 - Trang 1-9 - 2002
Nitrogen (N) cycling was determined in monocultures of Sorghumbicolor (L.) Moench and alley cropped sorghum with Acaciasaligna (Labill.) H. Wendl. in semiarid Northern Kenya. N inputthrough biological N2 fixation of the acacia, N transfer from thelegume to the intercrop and losses of applied N through harvest and leachingwere estimated using 15N enrichment. The biological N2fixation and N transfer......
Effect of ortho- and pyrophosphates on dissolution of Fe, Al, Si, Ca, and organic C in three soils
Springer Science and Business Media LLC - Tập 20 - Trang 51-58 - 1989
Phosphate application changes chemical properties of surface soils, consequently influencing crop nutrient availability and pedological process. Sodium ortho- (OP) or pyrophosphate (PP) was equilibrated with three Quebec soils: an Uplands sand (Orthic-Podzol), a St. Bernard loam (Eutric-Cambisol), and a Dalhousie clay (Humic Gleysol) in 0.03 M KClO4 solution at an initial pH 6.0. Both autoclaved a......
The comparison of nitrogen use and leaching in sole cropped versus intercropped pea and barley
Springer Science and Business Media LLC - Tập 65 - Trang 289-300 - 2003
The effect of sole and intercropping of field pea (Pisumsativum L.) and spring barley (Hordeum vulgareL.) and of crop residue management on crop yield,NO3
− leaching and N balance in the cropping systemwas tested in a 2-year lysimeter experiment on a temperate sandy loam soil. Thecrop rotation was pea and barley sole and intercrops followed by winter-rye anda fallow period. The Land Equivalent Rat......
Nitrate distribution and accumulation in an Ustochrept soil profile in a long term fertilizer experiment
Springer Science and Business Media LLC - Tập 28 - Trang 173-177 - 1991
Distribution and accumulation of NO3—N, down to 210 cm depth, in the soil profile of a long term fertilizer experiment were studied after 16 cycles of cropping (maize-wheat-fodder cowpea). The application of fertilizer N without P and K or in combination with only P resulted in higher NO3—N concentration in the soil profile than the application of N with P and K. With an annual application of 320 ......
The tolerance of a grass forage, grown in pots, to urea applied to calcareous soils under very hot, dry conditions
Springer Science and Business Media LLC - Tập 5 - Trang 175-180 - 1984
Proso grass was grown in pots in calcareous soils that received different levels of urea applied at seeding under very hot, dry conditions. Urea applications greater than 83 mg N kg/1 in one experiment and 130 mg N kg/1 in another caused severe toxicity to the grass seedlings. The toxicity corresponded to the period of active urea hydrolsis, 3–5 days from germination. At this time detectable NH4 i......
A simple model for estimating the nitrogen fertilizer requirement of a cereal crop
Springer Science and Business Media LLC - Tập 5 - Trang 95-108 - 1984
A static model that predicts the nitrogen (N) fertilizer requirement of grain sorghum or wheat crops is described. Inputs required by the model are soil nitrate-N (kg ha−1) in the profile at sowing, total N (%) in the plough layer, available water in the profile at sowing (mm) plus rainfall during the growing season (mm). Output includes fertilizer N required for both maximum yield and optimum eco......
Structural equation modeling for the estimation of interconnections between the P cycle and soil properties
Springer Science and Business Media LLC - Tập 109 - Trang 193-207 - 2017
The aim of this study was used a basic hypothetical structural model with latent variables to analyze the interconnections between the pools of stable P (inorganic P (Pi) and organic P (Po)), labile P (Pi and Po) and available P (Mehlich-1 P) and the pools of organic matter (OM) content and physicochemical properties in tropical soils of differing pedogenesis. We used structural equation modeling ......
Effect of split application of potassium on growth, yield and potassium accumulation by soybean
Springer Science and Business Media LLC - Tập 39 - Trang 217-222 - 1994
Field experiments were conducted during 1989 to 1991 on a loamy sand (Typic ustochrept) soil to study the K nutrition of soybean. Soybean responded significantly up to 50 kg K ha−1 when applied 1/2 of K at planting and 1/2 at flower initiation (two split) or applying 1/3 K at planting, 1/3 at flower initiation and 1/3 at pod development (three splits). Split application was more beneficial than ap......
A urine patch framework to simulate nitrogen leaching on New Zealand dairy farms
Springer Science and Business Media LLC - Tập 92 - Trang 329-346 - 2012
On New Zealand dairy farms, it is the nitrogen excreted directly onto pasture, particularly urine, that drives nitrogen (N) leaching from the farm. A new framework (UPF: Urine Patch Framework) is presented that post-processes the results of a whole farm model and runs a mechanistic soil model to simulate the urine patches. Two alternative methods to simulate the spatial distribution of urine patch......
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