Abstract

Aim: The aim of the study was to assess the effects of different organic manures and sowing dates on the growth and yield of carrot to identify the most effective combination for optimal productivity.

Materials and Methods: A field experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh, to evaluate the effects of different organic manure sources such as (i) cow dung 20 t ha^-1, (ii) poultry litter 12 t ha^-1, (iii) vermicompost 10 t ha^-1 and (iv) no organic matter (control);  and sowing dates (i) 1^st sowing (November 01), (ii) 2^nd sowing (November 15), and 3^rd sowing (November 30) on the growth and yield of carrot. The experiment was laid out in a randomized complete block design with three replications.

Results: The maximum plant height (47.4 cm), root length (21.5 cm), and yield (22.5 t ha^-1) were recorded from organic manure, cow dung 20 t ha^-1. For sowing time, maximum plant height (46.8 cm), root length (22.5 cm), and yield (22.6 t ha^-1) were found in sowing on 15^th November. In the case of the combined effect, the highest yield (28.7 t ha^-1) was obtained from sowing on 15^th November with cow dung 20 t ha^-1,and the lowest (14.8 t ha^-1) from sowing on 1^st November with no organic matter.

Conclusion: It was concluded that organic manure application-particularly cow dung at 20 t ha⁻¹—combined with mid-November sowing significantly enhances carrot growth and yield. These findings support adopting organic amendments and optimal planting time as sustainable strategies for improving carrot productivity.

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