ISSN:
1573-0867
Keywords:
Nitrogen response
;
phosphorus response
;
potassium response
;
soil phosphorus test
;
soil potassium test
;
sunflower
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract The nitrogen, phosphorus and potassium requirement of sunflower was evaluated when the crop was grown on siliceous sands overlying clay in the south east of South Australia. Of the seven sites used in the investigation, significant seed yield responses to phosphorus were recorded at two, while at a further two sites seed yields were increased by potassium additions. Nitrogen applications did not significantly increase seed yields at any site but decreased seed yields at two. This lack of nitrogen response was attributed to the sites having been long term legume pastures prior to the sunflower crops. Oil concentrations of sunflower seed ranged from 40.6% to 45.3% between sites, but fertilizer treatment had no significant effect. Critical nutrient ranges for both soil (Colwell) extractable phosphorus and potassium were derived at maximum seed yield. These were 16–20 mg kg−1 for extractable phosphorus and 70–80 mg kg−1 for extractable potassium.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01049749
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