Coffee is generally rainfed; sprinkler irrigation in March–April improves blossoming and yield. The source gives NPK doses by species, crop age and expected yield, split across pre-blossom (March), post-blossom (May), mid-monsoon (August) and post-monsoon (October) — for example, total NPK of 80:60:80 kg/ha for Robusta yielding under one tonne per hectare. Ask your officer to match the schedule to your garden.
Pending expert review
Source
Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Coffee – Irrigation; manuring, pp. 197–198
