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acid acre agricultural Ammonia annum Arabs average yield bearing branch breaking buds canopy cassava cause cents chapter clove areas Clove Growers clove industry clove oil clove plantations clove seedlings clove stems clove trees coconut coconut meal colour copra cost cultivation damage described dieback disease distillation dressing drought dry cloves early epiphyte establishment eugenol export fertilisers frasila green cloves growth harvest heap hoeing inches inflorescence khoker cloves labour land large numbers later leaves loss Madagascar manure mature trees moisture mother of cloves mulch nitrogen nurse crop nursery occur oil content old trees Pemba Island phosphate Photo by F. B. picking pishi plantation owners planter planting potash present profit Protectorate rains red loam ring weeding saplings season seed shade soil spice Sudden death Superphosphate surface tap root termites treatment trial underplanting vanillin vuli weather weight young clove young trees Zanzibar cloves Zanzibar Island