In corn plants, post-anthesis n losses from aboveground biomass ranged from 10 to 20% of the fertilizer applied (francis et al, 1993) plant n loss was maximized at the n fertilization rate where the greatest leaf area occurred. Since the nitrate form of soil nitrogen is the one vulnerable to loss by leaching or denitrification, estimating how much of the applied nitrogen fertilizer was in the nitrate form when the rainy period began is important to estimating how much nitrogen may have been lost. If uan solution is broadcast over corn when plants are small (about 6 in), it's likely the damage will not result in yield loss even when plants are bigger (v4), the foliage damage caused by a rate as high as 90-100 lbs nitrogen/acre typically does not cause significant yield reduction. Post anthesis nitrogen loss from corn nitrogen (n) management practices of corn producers have been called into question because of nitrate contamination problems in surface and ground water fertilizer n has been strongly implicated as the major source of much of the nitrate that now exists in our water resources.
Two recently completed n fertilizer recovery studies on irrigated corn utilizing isotopic techniques were re-examined to quantify post-anthesis n losses from aboveground biomass of irrigated corn under different n regimes. For crop, corn was selected because it has high nitrogen requirement, which increases the potential for nitrate leaching the super sweet corn agro variety ( zea mays l) was planted on 23 february 1999, to the spacing of 75 cm ×25 cm. Post-anthesis nitrogen loss from corn agronomy journal 85: 659 - 63 [crossref] [google scholar] ) reported that losses through volatilization of nh 3 from plants increase when n concentration in corn plant is high and under water stress conditions, factors which increase the concentration of ammonia in the apoplast and therefore of nh 3 -n.
Effects of nitrogen spraying on flag leaf gs of winter wheat under waterlogging stress at the post-anthesis stage data are mean ± sd of ten measurements from three replications data are mean ± sd of ten measurements from three replications. Post-anthesis nitrogen loss from corn post-anthesis fertilizer application for protein enhancement post-anthesis fertilizer application for protein enhancement nd crop nitrogen calculator iphone (post-anthesis) nitrogen use efficiency definition, nitrogen use efficiency nitrogen use efficiency for cereals, plant nitrogen loss as nh3 post-anthesis nitrogen loss from corn agron. Row cultivation after surface application of urea and uan is best to minimize volatile loss applications can begin immediately after corn planting as long as the rows are visible and application does not cover plants. But once nitrogen is in the nitrate form it is vulnerable to leaching losses and denitrification under wet soil conditions table 1 the estimated rate of conversion of ammonia-n from banded urea to nitrate-n (heard from tiessen et al, 2003.
Isotopes of nitrogen (15 n) have been used to evaluate n transport in soil-plant systems, but these studies generally ignore the atmospheric component of n balance recent studies of atmospheric ammonia (nh 3) transport have shown the gaseous n component can be significant due to emission and absorption exchanges with the atmo. Post-anthesis nitrogen loss from corn d d francis, j s schepers, and m f vigil abstract published research has shown relatively large amounts of nh3 being lost from aboveground vegetation during grain development for var. Nitrogen (n) export from soils to streams and groundwater under the intensifying cropping schemes of the pampas is modest compared to intensively cultivated basins of europe and north america.
The volatile nh 3 losses depended on seasonal variations in climatic conditions affecting the growth and nitrogen economy of the crops and increased under conditions with excessive n absorption by roots and a high n concentration in the foliage. Resources are limited, thus improving resource use efficiency is a key objective for cereal-based cropping systems this field study was carried out to quantify resource use efficiencies in selected c3 and c4 cereals under split nitrogen (n) application regimes. Understanding nitrogen loss large rains raise questions about possible n loss and the need for supplemental n applications understanding the factors which influence nitrogen loss will help growers determine their specific situation and help them make more informed decisions.
Unraveling the complexity underpinning nitrogen (n) use efficiency (nue) can be physiologically approached via examining grain n sources and n internal efficiency (nie) (yield to plant n content ratio. At n fertilization rates of 150 to 160 lb n/acre, the annual nitrate-n loss per acre was 52 lb in the 1990-93 period, 9 lb in the 1994-99 period, and 39 lb in the 2000-04 period (average nitrate-n losses for the combined corn-soybean sequence.
Plant nitrogen loss as nh3 1 increased plant n loss with increasing nitrogen applied in winter wheat observed with 15n j plant nutr 23:219-230 (lees et al, 2000) 2 post-anthesis nitrogen loss from corn agron j 85:659-663 (francis et al, 1981) 3 effect of nitrogen rate on plant nitrogen loss in winter wheat varieties desta et al (1997. Two recently completed n fertilizer recovery studies on irrigated corn utilizing isotopic techniques were re-examined to quantify post-anthesis n losses from aboveground biomass of irrigated corn under different n regimes these studies were conducted at different sites, in different years, with fertilizer rates ranging from 50 to 300 kg n ha-1. Gaseous nitrogen losses from plants, in gaseous loss of nitrogen post-anthesis nitrogen loss from corn historical synthesis-analysis of changes in. A year like this year, where rainfall didn't cause a lot of nitrogen loss, you can probably go and apply the other half of the nitrogen you planned to apply to that field however, the strategy changes if you know you have some nitrogen losses due to rain.