Yield given in the source: 1250 kg/ha (the source does not state whether this is nuts or copra weight). The source also notes that crowded gardens often give fewer than 20 nuts per palm per year, and recommends keeping about 175 palms/ha. Actual yields depend on variety, palm age, care and local conditions.
Pending expert review
Source
Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Coconut – Yield; rejuvenation of gardens, pp. 223–224