+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The uptake of nitrogen by wheat, its agronomic efficiency and their relationship to soil and fertilizer nitrogen

Australian Journal of Agricultural Research 44(6): 1245-1258
The uptake of nitrogen by wheat, its agronomic efficiency and their relationship to soil and fertilizer nitrogen
Nitrogen uptake by wheat from both soil and fertilizer, and the efficiencies of fertilizer N (up to 116 kg/ha) for increasing yield and protein, were measured in 53 wheat fertilizer experiments during 1985-89 on the north-western slopes and plains of New South Wales (Australia). There was a highly significant (r-2 gt 0.70) and common relationship between N uptake in unfertilized wheat (tops and grains) and soil nitrate to 90 cm depth for 4 of the 5 years of the study. A different but significant relationship occurred in 1988 when heavy rainfall before sampling leached some of the soil N beyond the sampled depth but within the rooting zone. The uptake and recovery of fertilizer N were lower in 1989, when in-crop rainfall was much lower than in the other 4 years. However, there was greater transfer of N from the herbage to the grain than in the wetter years. With increasing increments of fertilizer N, there was a much larger average decline in agronomic efficiency than in the recovery of fertilizer N or in physiological efficiency. Consistent with this, the average protein efficiency of fertilizer N tended to increase with increasing increments in every year except 1989. Although the highest increment of fertilizer N was always the least efficient for increasing grain yield, it exceeded the level required for profitability (8 kg grain/kg fertilizer N) in 20% of experiments. In experiments in which agronomic efficiency of the highest fertilizer increment was too low for profitability, there were at least 10 experiments in which the protein response was probably sufficient to make the highest increment profitable. The agronomic, protein and physiological efficiencies of fertilizer N in at least 10% of these experiments were higher than previously recorded in Australia and are comparable with the highest values recorded for wheat in other regions of the world.

Accession: 002530006

DOI: 10.1071/AR9931245

Related references

The uptake of nitrogen of wheat, its agronomic efficiency and their relationship to soil and fertilizer nitrogen. Australian Journal of Agricultural Research 44(6): 1245-1258, 1993

The relationship of soil mineral nirate nitrogen with stem nitrate nitrogen concentration and of fertilizer nitrogen with the amount of nitrogen taken up by winter wheat in experiments testing nitrogen fertilizer in combination with aphicide and fungicides from 1980 to 1982. Journal of Agricultural Science 106(3): 497-508, 1986

Efficiency of soil and fertilizer nitrogen in relation to rice variety and application time, using 15N nitrogen isotope labelled fertilizer. II. Nutrient uptake and efficiency in fields Republic of Korea. 1982

Effects of nitrogen management on potato yield, fertilizer nitrogen uptake efficiency, and nitrogen movement in soil. Dissertation Abstracts International B, Sciences and Engineering 52(6): 2828B, 1991

Analysis of the soil nitrogen efficiency pattern and the diagnosis principle for nitrogen nutrition of rice (3). Soil nitrogen and nitrogen uptake pattern of supplementary fertilizer from the point of view of the diagnosis system. Agriculture and Horticulture 63(11): 1267-1270, 1988

Nitrogen fertilization timing effect on wheat production, nitrogen uptake efficiency, and residual soil nitrogen. Agronomy Journal 85(6): 1198-1203, 1993

Effects of irrigation and nitrogen fertilization on nitrogen uptake and nitrogen use efficiency of wheat on a clay terrace soil of Bangladesh. Journal of the Faculty of Agriculture, Kyushu University 45(1): 309-316, 2000

Effects of fertilizer nitrogen and soil moisture on mineralization nitrogen recovery and a values maximum nitrogen uptake under spring wheat grown in small lysimeters. Canadian Journal of Soil Science 58(1): 39-52, 1978

Nitrogen application in winter wheat grown in Mediterranean conditions: Effects on nitrogen uptake, utilization efficiency, and soil nitrogen deficit. Journal of Plant Nutrition 30(10-12): 1681-1703, 2007

Effect of source and rate of nitrogen on nitrogen uptake and fertilizer efficiency by spring wheat and barley. Agronomy Journal: 53-55, 1973