Deficiency of sulphur and nitrogen in seedling cocoa on an alluvial grassland of Guadalcanal, Solomon Islands
Three months after planting cocoa under Leucaena leucocephala shade trees established on a Themeda australis grassland alluvial plain, some cocoa seedlings had died, others were stunted, and their leaves were chlorotic with marginal necrosis. Deficiencies of nitrogen and possibly sulphur were suspected. A field trial compared effects of ammonium sulphate with equivalent amounts of S and N as gypsum and urea, separately and together. Nitrogen alone aggravated the condition and responses to sulphur alone were small. Good responses were obtained on plants receiving either formulation providing both N and S
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| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1975
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| Subjects: | THEOBROMA CACAO, PLANTULAS, ENFERMEDADES CARENCIALES, NITROGENO, AZUFRE, DEFICIENCIA DE MINERALES, SUELO ALUVIAL, PLANTAS DE SOMBRA, LEUCAENA LEUCOCEPHALA, THEMEDA AUSTRALIS, |
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| Summary: | Three months after planting cocoa under Leucaena leucocephala shade trees established on a Themeda australis grassland alluvial plain, some cocoa seedlings had died, others were stunted, and their leaves were chlorotic with marginal necrosis. Deficiencies of nitrogen and possibly sulphur were suspected. A field trial compared effects of ammonium sulphate with equivalent amounts of S and N as gypsum and urea, separately and together. Nitrogen alone aggravated the condition and responses to sulphur alone were small. Good responses were obtained on plants receiving either formulation providing both N and S |
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