EFFECTS OF N FERTILIZATION STRATEGY AND FIXED PLOUGHING DATE ON NITRATE LEACHING ON FIELD VEGETABLE CULTIVATION

2010 ◽  
pp. 115-122
Author(s):  
A. Schwarz ◽  
J. Pfenning ◽  
W.-A. Bischoff ◽  
H.-P. Liebig
Keyword(s):  
Nitrate Leaching ◽  
N Fertilization ◽  
Vegetable Cultivation

Nitrate leaching and N accumulation in a typical subtropical red soil with N fertilization

Geoderma ◽  
2022 ◽  
Vol 407 ◽  
pp. 115559
Author(s):  
Yue Dong ◽  
Jin-Ling Yang ◽  
Xiao-Rui Zhao ◽  
Shun-Hua Yang ◽  
Jan Mulder ◽  
...  
Keyword(s):  
Nitrate Leaching ◽  
N Fertilization ◽  
Red Soil ◽  
N Accumulation

Inorganic nitrogen losses to groundwater are minimal from two management-intensive grazing dairy farms in Maryland

2017 ◽  
Vol 33 (4) ◽  
pp. 347-359 ◽  
Author(s):  
Rachel E. Gilker ◽  
Ray R. Weil
Keyword(s):  
Nitrate Leaching ◽  
Inorganic Nitrogen ◽  
Shallow Groundwater ◽  
Dairy Farms ◽  
Herd Size ◽  
N Fertilization ◽  
Drinking Water Standard ◽  
Nitrate N ◽  
Nitrate Losses ◽  
Management Intensive Grazing

AbstractWith the advent of confined feeding systems and associated herd size increases, dairy farms have had to import more feed from off the farm, leading to on farm nutrient surpluses. Management-intensive grazing (MIG) is an alternative to confined feeding. Under MIG, the herd is rotated among small paddocks every 12–24 h for efficient conversion of forage into milk using grass pasture to provide most of the herd's nutritional needs. Previous research on MIG reported high concentrations of nitrate under grassed monolith lysimeters and grazed pastures. However, because of the high levels of nitrogen (N) fertilization and ponding of cow urine in lysimeters, these previous studies may have overestimated nitrate leaching losses from MIG systems as practiced in the mid-Atlantic region. To determine the extent of nitrate losses to groundwater under MIG in the mid-Atlantic, we sampled shallow groundwater biweekly for 3 yrs on six watersheds in three Maryland dairy farms, one confined and two MIG-based farms. Transects of nested piezometers and ceramic tipped suction lysimeters were installed in each watershed. Seasonal mean nitrate-N concentrations under the four grazed watersheds were generally lower than under the confined feeding farm watersheds and were generally below the widely used drinking water standard of 10 mg L−1. Average nitrate-N concentrations for all four grazed watersheds were between 4 and 7 mg L−1, while the two confined feeding farm watersheds averaged 7 and 11 mg L−1, indicating that the MIG system did not cause excessive nitrate leaching.

Nitrogen budget for fertilized carrot cropping systems in a Quebec organic soil

2014 ◽  
Vol 94 (2) ◽  
pp. 139-148 ◽  
Author(s):  
Jean Caron ◽  
Guillaume Théroux Rancourt ◽  
Carl Bélec ◽  
Nicolas Tremblay ◽  
Léon-Étienne Parent
Keyword(s):  
Crop Yield ◽  
Nitrate Leaching ◽  
N Mineralization ◽  
Cropping Systems ◽  
Organic Soil ◽  
N Fertilization ◽  
Nitrogen Budget ◽  
Nitrate Content ◽  
Net N Mineralization ◽  
Soil N

Caron, J., Rancourt, G. T., Bélec, C., Tremblay, N. and Parent, L.-É. 2014. Nitrogen budget for fertilized carrot cropping systems in a Quebec organic soil. Can. J. Soil Sci. 94: 139–148. After reclamation, organic soils tend to shift from net N immobilization to net N mineralization. The N amounts mineralized annually can be sufficient to cover the N needs of the crop, reducing the need for supplemental N fertilization. The objective of this study was to assess N budgets and to infer the apparent N mineralization in fertilized and unfertilized carrot (Daucus carota L.) crops in an organic soil in southwestern Quebec. Five pre-plant N fertilization treatments (0, 25, 50, 75, and a split 25+25 kg N ha−1) were applied over a 3-yr period to non-irrigated carrots. Crop yield and plant and soil N contents were measured. Apparent net N mineralization was an important source of N, averaging 117 kg N ha−1yr−1. Crop yield was not affected by the N fertilization rate, by splitting of the fertilizer application or by the previous year’s crop. Increasing the N fertilizer rate increased the soil nitrate content below the root zone (∼40 cm below the surface), enhancing the risk of nitrate leaching. Thus, because soil N mineralization was sufficient for the carrots’ requirements in this organic soil, supplemental N fertilization was found to be unnecessary and could exacerbate the environmental risk of nitrate leaching.

Solute transport in a hummocky landscape: I. Two-dimensional redistribution of bromide

2012 ◽  
Vol 92 (4) ◽  
pp. 609-629 ◽  
Author(s):  
S. O. Olatuyi ◽  
O. O. Akinremi ◽  
D. N. Flaten ◽  
D. A. Lobb
Keyword(s):  
Solute Transport ◽  
Nitrate Leaching ◽  
Agricultural Soils ◽  
Field Studies ◽  
N Fertilization ◽  
Two Dimensions ◽  
Slope Position ◽  
Two Dimensional ◽  
Lateral Movement ◽  
Crop Response

Olatuyi, S. O., Akinremi, O. O., Flaten, D. N. and Lobb, D. A. 2012. Solute transport in a hummocky landscape: I. Two-dimensional redistribution of bromide. Can. J. Soil Sci. 92: 609–629. Bromide has been widely used in field studies to estimate nitrate leaching in agricultural soils. This study examined the impacts of crop response to nitrogen fertilization on the vertical and lateral redistribution of bromide in the fall and spring seasons in a hummocky landscape. The study was carried out near Brandon, Manitoba, in 2007 and 2008, using two separate plots (Site-2007 and Site-2008). The plots were delineated into three landscape positions as upper (UPP), middle (MID) and lower (LOW) slope. A microplot at each landscape position received 15N labelled fertilizer (KNO3) at the rates of 0, 90 and 135 kg N ha−1, and KBr at the rate of 200 kg Br− ha−1. Site-2007 was seeded to canola while Site-2008 was seeded to winter wheat. Soil samples were taken within the microplot to a depth of 120 cm for vertical distribution, and up to 200 cm away from the microplot for lateral distribution of Br− in the top 20 cm depth. The downward movement of Br− in the soil was reduced under N fertilization. This resulted in the accumulation of Br− in fertilized plots, and a greater lateral movement of Br− in fertilized compared with unfertilized plots. The greatest vertical and lateral movement of Br− occurred at the LOW slope position. In the fall season following Br− application, 55 and 15% of the Br− applied were recovered in the vertical and lateral components of the landscape, respectively. Estimated loss of Br− due to vertical and lateral movement was 47% in the unfertilized treatment and 36% with N fertilization. The order of Br− loss in the two dimensions was: LOW (48%)>MID (40%)>UPP (37%). The study shows that crop response to N fertilization reduced the vertical movement of solute, thereby providing an experimental support for the “Campbell hypothesis” which states that N fertilization and proper rate of N application reduces nitrate leaching.

Replacing organic with mineral N fertilization does not reduce nitrate leaching in double crop forage systems under Mediterranean conditions

2016 ◽  
Vol 219 ◽  
pp. 83-92 ◽  
Author(s):  
Clara Ella Demurtas ◽  
Giovanna Seddaiu ◽  
Luigi Ledda ◽  
Chiara Cappai ◽  
Luca Doro ◽  
...  
Keyword(s):  
Nitrate Leaching ◽  
N Fertilization ◽  
Mineral N ◽  
Mediterranean Conditions

scholarly journals 1022 THE EFFECT OF NITROGEN STATUS ON PRODUCTIVITY AND RECOVERY OF ISOTOPICALLY LABELLED FERTILIZER N BY MATURE ALMOND TREES

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 574f-574
Author(s):  
Steven A. Weinbaum ◽  
Wesley Asai ◽  
David Goldhamer ◽  
Franz J.A. Niederholzer
Keyword(s):  
Nitrate Leaching ◽  
N Fertilization ◽  
Baseline Data ◽  
N Recovery ◽  
Fertilizer N ◽  
Nitrogen Status ◽  
Fertilizer N Recovery ◽  
Almond Trees ◽  
Leaf N

A project to study the interrelationships between leaf N conc., relative tree yield (RTY), nitrate leaching and fertilizer N recovery was established in 1990. Collection of pretreatment baseline data was followed by differential rates of N fertilization. Significant differences in leaf N conc. and RTY were obtained in 1992 and 1993, respectively. RTY is defined as tree yield in 1993 expressed as a percentage of pretreatment (1990) yield. 15N-depleted (NH4)2SO4 was applied postharvest in 1993 to 17 trees differing in RTY and leaf N conc., and recovery of labelled N in the blossoms of these trees (March, 1994) will be discussed.

IRRIGATION AND N FERTILIZATION MANAGEMENT AFFECTS NITRATE LEACHING IN STRAWBERRY PRODUCTION

2014 ◽  
pp. 503-510 ◽  
Author(s):  
T.G. Bottoms ◽  
T.K. Hartz ◽  
M.D. Cahn ◽  
B.F. Farrara
Keyword(s):  
Nitrate Leaching ◽  
N Fertilization
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