Performance and environmental effects of forage production on sandy soils. V. Impact of grass understorey, slurry application and mineral N fertilizer on nitrate leaching under maize for silage

2006 ◽  
Vol 61 (3) ◽  
pp. 243-252 ◽  
Author(s):  
M. Wachendorf ◽  
M. Buchter ◽  
K.C. Volkers ◽  
J. Bobe ◽  
G. Rave ◽  
...  
Keyword(s):  
Environmental Effects ◽  
Nitrate Leaching ◽  
Sandy Soils ◽  
N Fertilizer ◽  
Forage Production ◽  
Mineral N

scholarly journals Impact of potato-cereal rotations and slurry applications on nitrate leaching and nitrogen balance in sandy soils

2002 ◽  
Vol 82 (4) ◽  
pp. 469-479 ◽  
Author(s):  
M O Gasser ◽  
M R Laverdière ◽  
R. Lagacé ◽  
J. Caron
Keyword(s):  
Nitrate Leaching ◽  
N Uptake ◽  
Sandy Soils ◽  
Paper Mill ◽  
N Fertilizer ◽  
Pig Slurry ◽  
Mineral N ◽  
Leaching Losses ◽  
N Fertilizers ◽  
Crop N Uptake

Groundwater quality is at risk when high levels of N fertilizers are used on sandy soils. A monitoring program was initiated in the summer of 1995, to quantify nitrate leaching in sandy soils used for potato production near Quebec city, Canada. Three drainable lysimeters were installed in each of five fields, for a total of 15 lysimeters. During a 5-yr monitoring period, crop N uptake, mineral and organic N fertilizers use, nitrate concentrations and fluxes from drainage water at 1-m soil depth were assessed under potato, cereal and hay crops. In one field, a clover and timothy sod that received low mineral N fertilizer inputs generated the lowest annual nitrate leaching losses ranging from 7 to 20 kg NO3-N ha-1. High nitrate leaching losses (116 ± 40 kg N ha-1) were measured under potato crops receiving high mineral N fertilizer inputs. Cereals, including barley and wheat receiving moderate mineral N fertilizer inputs and in some instance N from pig slurry, dairy cow manure or paper mill sludge, also generated high nitrate leaching losses (88 ± 45 kg N ha-1). Only sod and oat crops generated annual flux averaged nitrate concentrations lower than 10 mg NO3-N L-1, the accepted standard for drinking water, while higher concentrations, ranging from 13 to 52 mg NO3-N L-1, were recorded under barley, wheat and potato crops receiving moderate to high amounts of mineral N fertilizer. Nitrate flux concentrations were moderate during the cropping season (May-August), highest in fall (September-December) and lowest in the winter-early spring period (January-April). After 5 yr of survey, use of pig slurry and paper mill sludge in potato-cereal crop rotations (51 to 192 kg N ha-1 annually) with mineral N fertilizers (103 to 119 kg N ha-1 annually) resulted in nitrate leaching losses (87 to 132 kg N ha-1 annually), at least 20 kg N ha-1 more than N exported by crop at harvest. More than 60% of N applied as pig slurry seemed to be unaccounted for in the partial N balance that included crop N uptake and nitrate leaching, suggesting that important losses probably occurred through ammonia volatilization, denitrification, or N immobilization in soil organic matter and crop residues. Key words: Barley, lysimeter, nitrate leaching, nitrogen balance, pig slurry, potato

Modeling spatial and temporal optimal N fertilizer rates to reduce nitrate leaching while improving grain yield and quality in malting barley

2021 ◽  
Vol 182 ◽  
pp. 105997
Author(s):  
Davide Cammarano ◽  
Bruno Basso ◽  
Jonathan Holland ◽  
Alberto Gianinetti ◽  
Marina Baronchelli ◽  
...  
Keyword(s):  
Grain Yield ◽  
Nitrate Leaching ◽  
N Fertilizer ◽  
Malting Barley ◽  
Yield And Quality ◽  
Grain Yield And Quality ◽  
Fertilizer Rates

scholarly journals The Nitrogen-Fixing Bacteria—Effective Enhancers of Growth and Chemical Composition of Egyptian Henbane under Varied Mineral N Nutrition

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 921
Author(s):  
Rania M. A. Nassar ◽  
Engy A. Seleem ◽  
Gianluca Caruso ◽  
Agnieszka Sekara ◽  
Magdi T. Abdelhamid
Keyword(s):  
Seed Yield ◽  
Field Experiments ◽  
Tropane Alkaloids ◽  
Pharmaceutical Products ◽  
N Fertilizer ◽  
Recommended Dose ◽  
Mineral N ◽  
N Nutrition ◽  
N Dose ◽  
Egyptian Henbane

Egyptian henbane (Hyoscyamus muticus L.) plants are rich sources of alkaloids used in pharmaceutical products. Recently, rising efforts have been devoted to reducing mineral fertilizer supply, production cost, and environmental pollution via decreasing the doses of nitrogenous fertilizers and adopting biofertilizer farming systems. Two field experiments were conducted to examine the potential role of N fixing bacteria Azotobacter spp. and Azospirillum spp. on the growth, mineral status, tropane alkaloids, leaf anatomy, and seed yield of Egyptian henbane grown with different levels of mineral nitrogen fertilizer, i.e., 25%, 50%, and 100% of the recommended dose, equal to 30, 60, and 120 kg N ha−1. N fertilizer improved growth, mineral elements, tropane alkaloids, seed yield, and yield components of Egyptian henbane, which showed a gradually rising trend as the rate of N fertilizer increased. High doses of N fertilizer presumably elicited favorable changes in the anatomical structure of Egyptian henbane leaves. The application of 50% N dose plus N fixing bacteria affected Egyptian henbane trials similarly to 100% of recommended N dose. In conclusion, the N fixing bacteria proved to be a sustainable tool for a two-fold reduction in the recommended dose of mineral N fertilizer and the sustainable management of Egyptian henbane nutrition.

Effects of the timing of ploughing-in temporary leguminous pastures and two winter cover crops on nitrogen mineralization, nitrate leaching and spring wheat growth

1995 ◽  
Vol 124 (1) ◽  
pp. 1-9 ◽  
Author(s):  
G. S. Francis ◽  
R. J. Haynes ◽  
P. H. Williams
Keyword(s):  
Spring Wheat ◽  
Nitrate Leaching ◽  
Cover Crops ◽  
N Uptake ◽  
First Year ◽  
Mineral N ◽  
Leaching Losses ◽  
Winter Cover ◽  
Winter Cover Crops ◽  
Second Year

SUMMARYTwo field experiments at Canterbury, New Zealand during 1991–93 investigated the effect of the timing of ploughing a 4-year-old ryegrass/white clover pasture and the effect of two winter cover crops on subsequent N mineralization, nitrate leaching and growth and N uptake of the following wheat crops.Net N mineralization of organic N (of plant and soil origin) increased with increased fallow period between ploughing and leaching. The total amount of N accumulated in the profile by the start of winter ranged from 107 to 131 and from 42 to 45 kg N/ha for fallow treatments started in March and May respectively. Winter wheat (planted in May) had no effect on mineral N contents by the start of winter, whereas greenfeed (GF) oats (planted in March) significantly reduced the mineral N content in one year.Cumulative leaching losses over the first winter after ploughing-in pasture varied markedly between years in relation to rainfall amount and distribution. Leaching losses were greater from the March fallow (72–106 kg N/ha) than the May fallow treatments (8–52 kg N/ha). Winter wheat did not reduce leaching losses in either year. GF oats did not reduce losses in 1991/92, but losses in 1992/93, when major drainage events occurred late in the winter, were only c. 40% of those under fallow.Incorporation of a large amount (> 7 t/ha dry matter) of pasture or GF oat residue in spring depressed yield and total N uptake of the following spring wheat, largely due to net N immobilization which could be overcome by the application of fertilizer N.First-year treatments had very little residual effect in the second year. Leaching losses over the second winter (mean 142 kg N/ha) were largely unaffected by the extent of first year leaching losses. Second year leaching losses were greater than first year losses, probably due to the greater amount of mineral N at depth in the soil before the start of the second winter.

scholarly journals Environmental effects on efficacy of herbicides for postemergence goosegrass (Eleusine indica) control

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Avat Shekoofa ◽  
James T. Brosnan ◽  
Jose J. Vargas ◽  
Daniel P. Tuck ◽  
Matthew T. Elmore
Keyword(s):  
Soil Moisture ◽  
Environmental Effects ◽  
Vapor Pressure Deficit ◽  
Sandy Soils ◽  
Silica Sand ◽  
Soil Drying ◽  
Silt Loam ◽  
Evaporative Demand ◽  
Eleusine Indica ◽  
High Soil Moisture

AbstractExperiments were conducted to understand environmental effects on efficacy of herbicides used to control goosegrass (Eleusine indica L. Gaertn.). Herbicides were applied to goosegrass maintained at soil moisture contents (VMC) of < 12%, 12 to 20%, or > 20%. Herbicides included fenoxaprop-p-ethyl (140 g ha−1), topramezone (25 g ha−1), foramsulfuron (44 g ha−1), 2,4-D + dicamba + MCPP + carfentrazone (860 + 80 + 270 + 28 g ha−1), and thiencarbazone-methyl + foramsulfuron + halosulfuron-methyl (22 + 45 + 69 g ha−1). Goosegrass control increased as VMC increased. Vapor pressure deficit (VPD) and air temperature were manipulated to determine effects of evaporative demand on foramsulfuron. Effects of soil drying were also studied following foramsulfuron application. Reductions in transpiration rate (TR) and leaf area were greatest with foramsulfuron applications to goosegrass in silt-loam under high evaporative demand (3 kPa VPD, 38 °C). Foramsulfuron had no effect on goosegrass in silica-sand regardless of evaporative demand. TR dropped to 0.2 mmh−1 within eight days after application to goosegrass in silt-loam compared to 18 days in silica-sand. Overall, foramsulfuron efficacy on goosegrass was maximized under conditions of high soil moisture and evaporative demand, and may be reduced in sandy soils that hold less water.

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