Myers, R.J.K. (1978) Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 1. Effect of rate of nitrogen fertilizer. Australian Journal of Experimental Agriculture and Animal Husbandry, 18 (93). pp. 554-563.
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Abstract
Responses of dryland grain sorghum to applied nitrogen (N) were examined in 3 field experiments at Katherine, Northern Territory in 1969-70, 1970-1, and 1971-2. Rates of N up to 89 kg/ha in the first season and up to 200 kg/ha in subsequent seasons were used. The crops were sampled at floral initiation, mid-elongation, anthesis and maturity. The 3 growing seasons were rated as below average, above average and average, respectively for grain sorghum production. N response was strongly season-dependent. Maximum yields (adjusted to 14% moisture) were 2.28 t/ha in 1969-70 with 22.4 kg N/ha applied (with lower yields at higher rates of N), 7.73 t/ha in 1970-1 with 150 kg N/ha applied and 4.44 t/ha in 1971-2 with 200 kg N/ha applied. These represented increases of 6, 50 and 62% over the no-N treatments. Applied N increased grain numbers/head and individual grain wt., but had no significant effect on head numbers. Applied N increased yields of N and P in plant material, and increased N levels in plant parts. Apparent recoveries of N fertilizer ranged from 0-40% depending on year and rate applied. An approximate balance sheet suggested substantial losses from the mineral N pool in 1970-1, a yr of above average rainfall. Significant interactions between N and P fertilizer occurred only with grains/head and 1000-grains wt.ADDITIONAL ABSTRACT:Responses of dryland grain sorghum to applied N were examined in 3 field experiments at Katherine, Northern Territory in 1969-70, 1970-1 and 1971-2. Rates of N up to 89 kg/ha in the first season and up to 200 kg/ha in subsequent seasons were used. The crops were sampled at floral initiation, mid-elongation, anthesis and maturity. The 3 growing seasons were rated as below av., above av. and av., resp., for grain sorghum production. N response was strongly season-dependent. Max. yields (adjusted to 14% moisture) were 2.28 t/ha in 1969-70 with 22.4 kg N/ha applied (with lower yields at higher rates of N), 7.73 t/ha in 1970-1 with 150 kg N/ha applied and 4.44 t/ha in 1971-2 with 200 kg N/ha applied. These represented increases of 6, 50 and 62%, resp., over the no-N treatments
| Item Type: | Article |
|---|---|
| Author Affiliation: | Division of Tropical Crops and Pastures, CSIRO, St Lucia, Queensland 4067, Australia |
| Subjects: | Plant Production |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 03 Jan 2013 08:12 |
| Last Modified: | 03 Jan 2013 08:12 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/9283 |
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