| Autor: |
Bacon, P. E., Hoult, E. H., McGarity, J. W., Alter, D. |
| Zdroj: |
Biology and Fertility of Soils; September 1989, Vol. 7 Issue: 3 p263-268, 6p |
| Abstrakt: |
A field study was undertaken to examine the effects of various management strategies on wheat (Triticum aestivum L.) performance and N cycling in an intensively cropped soil. Microplots receiving 100 kg N ha-1 as15NH4+15NO3- at sowing, tillering or stem elongation were compared with unfertilized microplots. Stubble from the previous rice crop was either incorporated, burnt without tillage, burnt then tilled or retained on the surface of untilled soil. Wheat grain yield ranged from 1.5 to 5.1 t ha- and was closely related to N uptake. Plant accumulation of soil N averaged 36 kg N ha-1 (LSD 5% = 10) on stubble-incorporation plots and 54 kg N ha-1 on stubble-retention plots. Fertilizer N accumulation averaged 18 kg N ha-1 (LSD 51% = 6) on stubble-incorporation plots and 50 kg N ha-1 on stubble-retention plots. Tillage had little effect on burnt plots. Delaying N application from sowing until stem elongation increased average fertilizer N uptake from 26 to 39 kg N ha-1 (LSD 5% = 6), but reduced soil N uptake from 50 to 37 kg N ha- (LSD 5% = 10). |
| Databáze: |
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