Effect of microclimate on broccoli (Brassica oleracea Var. Italica) yield under open field and poly house in Chhattisgarh plain agroclimatic condition

The present investigation entitled “Effect of microclimate on Broccoli (Brassica Oleracea Var. Italica) yield under open field and poly house in Chhattisgarh plain agroclimatic condition’’ was undertaken during the rabi season of 2024–25 at the Centre of Excellence on Protected Cultivation and Precision Farming, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.). study the effect of microclimate on growth, development, yield and yield attributes of Broccoli (Brassica oleracea var. italica., varieties Saki and Green Magic) under open field and naturally ventilated polyhouse conditions. The mean weakly air temperature during crop growth period were found to be higher inside the polyhouse (20.7⁰C) at 7:00 AM and at 2:00 PM it was higher in open field (28.7⁰C) respectively. Relative humidity was always higher in polyhouse condition as compared to open field. Broccoli grown under open field conditions recorded lower growth and yield: plant height of both varieties Saki and Green Magic (36.82, 34.84 cm plant⁻¹), number of leaves (41,12 leaves plant⁻¹), curd diameter of both varieties (7.5 and 6.9 cm), curd weight (139.4 and 102.2 g plant^-1), and curd yield (77.4 and 56.77 q ha^-1). While crop grown under polyhouse condition reported enhanced value of these parameters: plant height of both varieties (40.14 and 38.56 cm plant⁻¹), leaves (15 and 14 leaves plant⁻¹), curd diameter of both varieties (8.66 and 8.2 cm), curd weight (180.2 and 130.2 g plant^-1) and curd yield (100,72.33q ha^-1).In the open field, Saki variety yield decreases when temperature 7:00 AM and 2:00 PM (r = –0.981*, r = -0.960*) and morning light (r = –0.930). However, yield increased with relative humidity (RH-I: 0.998**, RH-II: 0.998**) and with light during the afternoon (r = 0.942). In the polyhouse, found to be non-significant. Similarly, Green Magic variety in open field broccoli yield decreases when temperature 7:00 AM (r = -0.997*) and morning light intensity (r = -0.967*). However, yield increased with relative humidity (RH- I: 0.984*, RH- II: 0.985*) and with light during the afternoon (r = 0.975*).